Prof. Dr. rer. nat. habil. Beate Röder

Profil

• Anregungsenergietransfers in supramolekularen Komplexen

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 01/2010 - 03/2013 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Begutachtung von Fluoreszenzmessungen

  Quelle ↗

  Zeitraum: 11/2011 - 12/2011 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Cell- and Mitochondria-Specific Fluorophores with Improved Photophysical Characteristics

  Quelle ↗

  Zeitraum: 11/2007 - 03/2011 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Development of antimicrobial additives for wall painting

  Quelle ↗

  Förderer: DAAD Zeitraum: 01/2010 - 12/2011 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Development of Cell Type Specific Drug Carrier Systems for Cancer Therapy

  Quelle ↗

  Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 11/2006 - 10/2009 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Eingangsstudie zur Untersuchung der UV-Beständigkeit von Kabelmänteln

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 03/2014 - 08/2014 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Erarbeitung eines Konzepts für ein mobiles Fluoreszenzmessgerät zur Früherkennung von Alterungserscheinungen in Photovoltaik-Modulen

  Quelle ↗

  Zeitraum: 09/2006 - 12/2006 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Exist-Seed: Greateyes

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 01/2007 - 12/2007 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Früherkennung von Alterungserscheinungen in Photovoltaik-Modulen

  Quelle ↗

  Zeitraum: 11/2007 - 02/2008 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Korrelation von Klimadaten mit Schäden an frei bewitterten PV-Modulen

  Quelle ↗

  Zeitraum: 06/2012 - 05/2013 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• L-AIR activator

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 04/2012 - 10/2012 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• LAURA_Teilvorhaben: Untersuchungen zur Eignung der Photolumineszenz als nicht-invasive Methode zur Charakterisierung und Beurteilung des Zustandes von EVA-basierten Einbettungspolymeren

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 06/2014 - 09/2017 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Nutzung optischer Methoden als in vitro Freisetzungstest für Nanoarzneiformen

  Quelle ↗

  Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 05/2015 - 04/2018 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• PAMAM dendrimers as carrier systems for PDT drugs

  Quelle ↗

  Förderer: DAAD Zeitraum: 01/2014 - 12/2015 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photoaktive antimikrobielle Beschichtungen

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 04/2017 - 02/2020 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photodynamic agents producing reactive oxygen species in acrylat dispersions

  Quelle ↗

  Zeitraum: 05/2010 - 10/2010 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photophysikalische Eigenschaften und photobiologische Aktivität von Fulleren-Dendrimer-Sensibilisator-Komplexen (I)

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 01/2003 - 03/2005 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photophysikalische Eigenschaften und photobiologische Aktivität von Fulleren-Dendrimer-Sensibilisator-Komplexen (II)

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 07/2004 - 12/2006 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photophysik von Porphyrin-Chinon Heterodimeren mit Abständen von 5-20 Angström in Nanobrunnen

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 08/2004 - 10/2007 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Photo-triggered Drug Release Systems

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 04/2010 - 07/2015 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Phthalocyanine-Porphyrin Assemblies for Solar Light Conversion

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 05/2008 - 09/2012 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Plaques-AIR

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 04/2014 - 01/2015 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Plaques-AIR

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 04/2014 - 01/2015 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Project Inspecsol

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 03/2011 - 11/2012 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Rapid methods for the testing of tetrapyrrolic derivatives as photosensitizers for photodynamic antimicrobial therapy.

  Quelle ↗

  Förderer: DAAD Zeitraum: 01/2012 - 12/2013 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Saubere und schöne Fassaden

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 09/2011 - 08/2012 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Singlet Molecular Oxygen and Photodynamic Effects (PDE)

  Quelle ↗

  Förderer: DFG sonstige Programme Zeitraum: 05/2017 - 07/2017 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Solar Collectors made of Polymers

  Quelle ↗

  Zeitraum: 12/2011 - 05/2015 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Theorie des Anregungsenergietransfers in supramolekularen Komplexen

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 03/2006 - 05/2009 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Überprüfung der Singulettsauerstoffgenerierung

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 02/2012 - 02/2012 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Untersuchung der Alterung von Einbettungspolymeren in Minimodulen mittels Fluoreszenz

  Quelle ↗

  Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 02/2011 - 10/2011 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Untersuchung des Zeitverhaltens der lichtinduzierten Anisotropie speziell substituierter Metallo-Phthalocyanine in Lösung und dünnen Schichten zur Aufklärung der Moleküldynamik im Grund- und im angeregten Zustand mittels TDS (I)

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 09/2003 - 08/2005 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Untersuchung des Zeitverhaltens der lichtinduzierten Anisotropie speziell substituierter Metallo-Phthalocyanine in Lösung und dünnen Schichten zur Aufklärung der Moleküldynamik im Grund- und im angeregten Zustand mittels TDS (II)

  Quelle ↗

  Förderer: DFG Sachbeihilfe Zeitraum: 09/2005 - 08/2006 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Weiterentwicklung eines Konzepts für ein mobiles Fluoreszenzmessgerät zur Früherkennung von Alterungserscheinungen in Polymermaterialien im Rahmen des Forschungsvorhabens EMSIS

  Quelle ↗

  Zeitraum: 12/2007 - 12/2008 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• Zuverlässigkeit von PV-Modulen (Teilprojekt: Optische Materialanalytik)

  Quelle ↗

  Förderer: Bundesministerium für Umwelt, Klimaschutz, Naturschutz und nukleare Sicherheit Zeitraum: 08/2009 - 12/2013 Projektleitung: Prof. Dr. rer. nat. habil. Beate Röder

• AVENTA AS

  KPT

  50 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• HTCO GmbH - Dr. Axel Müller

  KPT

  47 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• DS Smith Kaysersberg Paper Mill

  KPT

  49 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• PPI Plastic Products Innovation GmbH & Co KG

  KPT

  46 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• advanced polymer compounds

  KPT

  49 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• GREENoneTEC Solarindustrie GmbH

  KPT

  47 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• POLYTEC PLASTICS Ebensee GmbH

  KPT

  49 Treffer85.0%
  • Solar Collectors made of Polymers
    K

    85.0%

• Science & Startups Berlin

  T

  28 Treffer57.7%
  • Zuwendung im Rahmen des Programms „exist – Existenzgründungen aus der Wissenschaft“ aus dem Bundeshaushalt, Einzelplan 09, Kapitel 02, Titel 68607, Haushaltsjahr 2026, sowie aus Mitteln des Europäischen Strukturfonds (hier Euro-päischer Sozialfonds Plus – ESF Plus) Förderperiode 2021-2027 – Kofinanzierung für das Vorhaben: „exist Women“
    T

    57.7%

• Peugeot Citroen Automobiles S.A.

  PT

  85 Treffer57.4%
  • EU: Monomer Sequence Control in Polymers: Toward Next-Generation Precision Materials (EURO-SEQUENCES)
    T

    57.4%

• Ionera Technologies GmbH

  PT

  85 Treffer57.4%
  • EU: Monomer Sequence Control in Polymers: Toward Next-Generation Precision Materials (EURO-SEQUENCES)
    T

    57.4%

• Lipid nanoparticles for skin penetration enhancement—correlation to drug localization within the particle matrix as determined by fluorescence and parelectric spectroscopy

  2005

  Journal of Controlled Release · 231 Zitationen · DOI

• Degradation of the encapsulant polymer in outdoor weathered photovoltaic modules: Spatially resolved inspection of EVA ageing by fluorescence and correlation to electroluminescence

  2012

  Solar Energy Materials and Solar Cells · 106 Zitationen · DOI

• Correlation of photophysical parameters with macrocycle distortion in porphyrins with graded degree of saddle distortion

  2010

  Photochemical & Photobiological Sciences · 98 Zitationen · DOI

• Photodynamic inactivation of mold fungi spores by newly developed charged corroles

  2014

  Journal of Photochemistry and Photobiology B Biology · 96 Zitationen · DOI

• Photophysical studies of the pheophorbide a dimer

  2000

  Journal of Photochemistry and Photobiology B Biology · 90 Zitationen · DOI

• Exploring Base‐Pair‐Specific Optical Properties of the DNA Stain Thiazole Orange

  2006

  Chemistry - A European Journal · 84 Zitationen · DOI

  Double-stranded DNA offers multiple binding sites to DNA stains. Measurements of noncovalently bound dye-nucleic acid complexes are, necessarily, measurements of an ensemble of chromophores. Thus, it is difficult to assign fluorescence properties to base-pair-specific binding modes of cyanine dyes or, vice versa, to obtain information about the local environment of cyanines in nucleic acids by using optical spectroscopy. The feasibility to stain DNA and simultaneously probe local perturbations by optical spectroscopy would be a valuable asset to nucleic acid research. So-called FIT probes (forced intercalation probes) were used to pinpoint the location of the DNA stain thiazole orange (TO) in PNADNA duplexes. A detailed analysis of the base-pair dependence of optical properties is provided and enforced binding of TO is compared with "classical" binding of free TO-PRO1. UV-visible absorbance, circular dichroism (CD) and fluorescence spectroscopy, and melting-curve analyses confirmed site-specific TO intercalation. Thiazole orange exhibited base-specific responses that are not observed in noncovalent dye-nucleic acid complexes, such as an extraordinary dependence of the TO extinction coefficient (+/-60 % variation of the averaged epsilon(max) of 57,000 M(-1) cm(-1)) on nearest-neighbor base pairs. TO signals hybridization, as shown by increases in the steady-state fluorescence emission. Studies of TO fluorescence lifetimes in FIT-PNA and in DNADNA and PNADNA complexes highlighted four different fluorescence-decay processes that may be closed or opened in response to matched or single-mismatched hybridization. A very fast decay process (0.04-0.07 ns) and a slow decay process (2.33-3.95 ns) provide reliable monitors of hybridization, and the opening of a fast decay channel (0.22-0.48 ns) that resulted in an attenuation of the fluorescence emission is observed upon the formation of mismatched base pairs.

• Synthesis and Photophysical Properties of Annulated Dinuclear and Trinuclear Phthalocyanines

  2005

  Chemistry - A European Journal · 84 Zitationen · DOI

  Metal-free mononuclear, dinuclear and trinuclear phthalocyanines were prepared by a mixed cyclotetramerisation of a 1,2,4,5-tetracyanobenzene derivative and 4,5-bis(2,6-dimethylphenoxy)phthalonitrile. For the first time, a pi-electron-conjugated trinuclear phthalocyanine was synthesised with phthalocyanine units connected by common annulated benzene rings. The Q band of the trinuclear compound in solution occurs at lambda = 944 nm whereas those of the dinuclear and mononuclear compounds are at lambda = 853/830 and 701/664 nm, respectively. Fluorescence quantum yields, fluorescence lifetimes and singlet-oxygen quantum yields of the compounds were determined.

• On the Correlation Between Hydrophobicity, Liposome Binding and Cellular Uptake of Porphyrin Sensitizers

  2006

  Photochemistry and Photobiology · 83 Zitationen · DOI

  A crucial factor in choosing a porphyrin or analogous photosensitizer for photodynamic therapy (PDT) is its ability to incorporate into the cells. For hydrophobic compounds that partition passively into the cytoplasmic membrane, a partition coefficient between an organic solvent and water, P, is one factor that could be used to predict the molecule's ability to diffuse into biomembranes. We synthesized several porphyrins, modified with two, three or four meso-substituents and studied their spectroscopic and photophysical properties. The octanol-water partitioning coefficients, log P, were calculated as a parameter for hydrophobicity. We found these porphyrins to be very hydrophobic, with log P values in the range of 8.9-11.8. These were correlated with the binding constants of these porphyrins into liposomes, K(b), as well as to their uptake by cells. The correlation between the estimated log P and K(b) is nearly linear but negative, indicating, apparently, that there is lesser binding to liposomes with increased hydrophobicity. On the other hand, all of the studied porphyrins are taken up by cells, but there is no clear correlation between cellular uptake and the log P or K(b). Lipinski's pharmacological "rule of 5" predicts poor permeation of drugs into cells when log P is greater than five. This may be relevant for diffusional binding to liposomes, where aqueous aggregation can interfere strongly with cellular uptake. In such extreme conditions, neither liposome binding nor other rules seem to predict porphyrin behavior in vitro.

• The evaluation of NIR-absorbing porphyrin derivatives as contrast agents in photoacoustic imaging

  2013

  Physical Chemistry Chemical Physics · 82 Zitationen · DOI

  Six free base tetrapyrrolic chromophores, three quinoline-annulated porphyrins and three morpholinobacteriochlorins, that absorb light in the near-IR range and possess, in comparison to regular porphyrins, unusually low fluorescence emission and (1)O2 quantum yields were tested with respect to their efficacy as novel molecular photo-acoustic imaging contrast agents in a tissue phantom, providing an up to ∼2.5-fold contrast enhancement over that of the benchmark contrast agent ICG. The testing protocol compares the photoacoustic signal output strength upon absorption of approximately the same light energy. Some relationships between photophysical parameters of the dyes and the resulting photoacoustic signal strength could be derived.

• Switching the photo-induced energy and electron-transfer processes in BODIPY–phthalocyanine conjugates

  2009

  Chemical Communications · 78 Zitationen · DOI

  Two novel silicon(IV) phthalocyanines substituted axially with two BODIPY or mono-styryl BODIPY moieties have been synthesised, which exhibit predominantly a photo-induced energy or electron-transfer process in toluene depending on the axial substituents.

• Water-Soluble Polymer Conjugates of ZnPP for Photodynamic Tumor Therapy

  2007

  Bioconjugate Chemistry · 77 Zitationen · DOI

  Zn-protoporphyrin (ZnPP) is a promising candidate for cancer therapy. It is known to inhibit heme-oxygenase-1 (HO-1), resulting in suppressed biliverdin/bilirubin production accompanying lowered antioxidative capacity. As a consequence, a significant suppression of tumor growth in vivo was reported. Recent findings also showed that ZnPP efficiently generated reactive singlet oxygen under illumination of visible light. In the present report, we describe the photosensitizing capabilities of water-soluble polymer conjugates of ZnPP as novel compounds for photodynamic therapy against solid tumors. The polymer conjugation made ZnPP water-soluble, thus possible for injection for its aqueous solution. The cellular uptake and photobiological activity of ZnPP derivatives have been tested using a human T-cell leukemia cell line in vitro and demonstrated most potent phototoxic effects of SMA-ZnPP followed by PEG-ZnPP under aerobic conditions.

• Fluorescence Quenching and Size Selective Heterodimerization of a Porphyrin Adsorbed to Gold and Embedded in Rigid Membrane Gaps

  1999

  Journal of the American Chemical Society · 73 Zitationen · DOI

  Octaanionic meso-tetra(3,5-dicarboxylatophenyl) porphyrin 1 was adsorbed to gold electrodes at pH 12 and stayed there after repeated washing with 10-2 M KOH. The fluorescence on sputtered gold surfaces amounted to 10% of the intensity observed on an organic subphase. Addition of 10-6 M aqueous solutions of the manganese(III) complexes of an isomer mixture of tetracationic β-tetraethyl-β‘-tetrakis(1-methyl-4-pyridinium)- and meso-4-(1-methyl-4-pyridinium)phenyl porphyrins 2 and 4 at pH 12 quenched the fluorescence quantitatively. Visible spectroscopy proved that the amount of porphyrin 1 on the gold surface had not changed. The octaanionic porphyrin 1 was then embedded in a membrane by self-assembly of a bolaamphiphile containing two secondary amide groups. Two hydrogen bond chains rigidify such a monolayer. The emission of porphyrin 1 remained after the self-assembly process. 1 was now localized on the bottom of a rigid membrane gap. Its fluorescence was again quantitatively quenched by the tetracationic manganese(III) porphyrinate 2, which fit in with the membrane gap. A larger manganese(III) porphyrin with a phenyl spacer between the porphyrin and methyl pyridinium rings could not enter, and no quenching was observed. The same experiment with a more fluid membrane made of octadecanethiol showed no such discriminating effect. The entrapment of 1,2-trans-cyclohexanediol within the “immobile” water volume of the membrane gap is also reported. Water-soluble compounds have thus been separated within a 2 nm3 water volume from bulk water. So far, the membrane pores with a porphyrin bottom resemble natural enzyme clefts.

• Photodynamic effects induced by meso-tris(pentafluorophenyl)corrole and its cyclodextrin conjugates on cytoskeletal components of HeLa cells

  2014

  European Journal of Medicinal Chemistry · 69 Zitationen · DOI

• Brightness through Local Constraint—LNA‐Enhanced FIT Hybridization Probes for In Vivo Ribonucleotide Particle Tracking

  2014

  Angewandte Chemie International Edition · 67 Zitationen · DOI

  Imaging the dynamics of RNA in living cells is usually performed by means of transgenic approaches that require modification of RNA targets and cells. Fluorogenic hybridization probes would also allow the analysis of wild-type organisms. We developed nuclease-resistant DNA forced intercalation (FIT) probes that combine the high enhancement of fluorescence upon hybridization with the high brightness required to allow tracking of individual ribonucleotide particles (RNPs). In our design, a single thiazole orange (TO) intercalator dye is linked as a nucleobase surrogate and an adjacent locked nucleic acid (LNA) unit serves to introduce a local constraint. This closes fluorescence decay channels and thereby increases the brightness of the probe-target duplexes. As few as two probes were sufficient to enable the tracking of oskar mRNPs in wild-type living Drosophila melanogaster oocytes.

• Inhibition of green algae growth by corrole-based photosensitizers

  2014

  Journal of Applied Microbiology · 67 Zitationen · DOI

  Phototrophic biofilms are an important factor in biofouling and biodeterioration of building materials, causing great damage to historic and contemporary constructions. Growth inhibition of phototrophic organisms using photodynamic inactivation could pose an alternative to the use of biocides. To this end, successful application of this approach on green algae is a vital step in the development of suitable photosensitizers.

• On the Influence of Higher Excited States on the ISC Quantum Yield of Octa‐aL‐alkyloxy‐substituted Zn‐Phthalocyanine Molecules Studied by Nonlinear Absorption

  1997

  Photochemistry and Photobiology · 58 Zitationen · DOI

  Abstract— Octa‐aL‐alkyloxy‐substituted Zn‐phthalocyanines are an interesting class of far red‐absorbing photosensitizers. The chemical structure, the calculated steric conformation, the observed linear optical properties and an anomalous luminescence from a higher than S, excited state are reported. To study the optical properties of higher excited states and their occupation dynamics up to delay times of 15 ns we have carried out measurements of transient absorption spectra after 14 ps pulsed, resonant B‐band and Q‐band excitation. From these measurements the excited state singlet‐singlet and triplet‐triplet spectra as well as the intersystem crossing (ISC) quantum yields are obtained. The main result is an excitation wavelength‐dependent ISC quantum yield that can be explained by an additional ISC channel between higher excited singlet and triplet states. The large rate of this channel is justified by the resonance between higher triplet states, observed in the triplet‐triplet spectrum and the B, absorption band. Using kinetic model calculations, a lifetime of the higher excited singlet state of some picoseconds is predicted and the influence of a two‐step absorption process on the population density of this higher excited singlet state is discussed.

• Accelerated aging of polyethylene materials at high oxygen pressure characterized by photoluminescence spectroscopy and established aging characterization methods

  2014

  Polymer Degradation and Stability · 55 Zitationen · DOI

• Fullerene-pyropheophorbide a complexes as sensitizer for photodynamic therapy: Uptake and photo-induced cytotoxicity on Jurkat cells

  2005

  Journal of Photochemistry and Photobiology B Biology · 54 Zitationen · DOI

• Influence of substitutions on asymmetric dihydroxychlorins with regard to intracellular uptake, subcellular localization and photosensitization of Jurkat cells

  2004

  Journal of Photochemistry and Photobiology B Biology · 53 Zitationen · DOI

• The Influence of Solvent Polarity and Metalation on Energy and Electron Transfer in Porphyrin−Phthalocyanine Heterotrimers

  2007

  The Journal of Physical Chemistry B · 52 Zitationen · DOI

  Heteroporphyrin and -phthalocyanine arrays represent an attractive class of light harvesters and charge-separation systems exhibiting an easy route of synthesis and high chemical stability. In the present work, we report the results of photophysical investigations of two novel non-sandwich-type porphyrin-phthalocyanine heterotriads, in which two meso-tetraphenylporphyrin rings (H2TPP or ZnTPP) are linked to the central silicon atom of a silicon(IV) phthalocyanine core. It was found that the photophysical properties of the triads (H2Tr and ZnTr) in N,N-dimethylformamide (DMF) and toluene are strongly affected by two different types of interaction between the porphyrin (P) and the phthalocyanine (Pc) parts, namely excitation energy transfer (EET) and photoinduced charge transfer. The first process results in appearance of the Pc fluorescence when the P-part is initially excited, and plays a dominant role in fast depopulation of the first excited singlet state of the P moiety. If the first excited singlet state of the Pc-part is populated (either directly or via EET), it undergoes fast depopulation by hole transfer (HT) to the charge-separated (CS) state. In polar DMF, the CS state is the lowest excited state, and the charge recombination occurs directly to the ground state. Using transient absorption spectroscopy, the lifetime of the CS state was estimated to be 30 and 20 ps for H2Tr and ZnTr, respectively. In nonpolar toluene, the energy gap between the first excited singlet state of the Pc-part and the CS state is very small, and back HT occurs in both triads, resulting in appearance of "delayed fluorescence" of the Pc-part with a decay time similar to the lifetime of the CS state (190 and 280 ps for H2Tr and ZnTr, respectively). Since the energy of the CS state of ZnTr in toluene is lower than that of H2Tr, the probability of back HT for ZnTr is lower. This was clearly proved by decay-associated fluorescence spectral measurements.

• Synthesis and in Vitro Testing of a Pyropheophorbide-<i>a</i>-Fullerene Hexakis Adduct Immunoconjugate for Photodynamic Therapy

  2007

  Bioconjugate Chemistry · 49 Zitationen · DOI

  The employment of carriers to enhance drug selectivity is one of the strategies to increase the efficacy and reduce the side effects of antitumor therapy. The concept of a modular carrier system (MCS) was developed to construct a complex drug having a high efficacy and selectivity. An MCS employs diverse units or modules: beside the therapeutic unit, an addressing unit (e.g., an antibody) serves to direct the drug to its target, and a multiplying unit has the role of increasing the number of biological active moieties the system can carry. In this paper, we report on the synthesis of a modular carrier system in which the role of multiplying unit is given to a [5:1]fullerene hexakis adduct. This fullerene hexaadduct has five malonate spacers which can bind two therapeutic units (the photosensitizer pyropheophorbide-a) each, for a total of ten, and a longer malonate spacer which serves for the conjugation to the addressing unit, the monoclonal antibody rituximab. Confocal microscopy studies using Epstein-Barr virus-transformed B-lymphocytes and Jurkat cells showed that the antibody conjugate conserves the affinity for its receptor (CD20) and its selectivity toward CD20 positive B-lymphocytes. On the contrary, the antibody-free complex did not show any bounding or intracellular uptake.

• Photoinduced electron and energy transfer in a new porphyrin–phthalocyanine triad

  2006

  Chemical Physics · 49 Zitationen · DOI

• Excitonic Coupling between B and Q Transitions in a Porphyrin Aggregate

  2003

  The Journal of Physical Chemistry B · 49 Zitationen · DOI

  Aggregation distinctively changes the absorption and fluorescence anisotropy spectrum of β-tetraethyl-tetrapyridinyl-porphyrin 1. A large excitonic splitting of the B band occurs, and the Q band absorption is distinctively enhanced. The latter effect must be attributed to intensity transfer from the B- to the Q-band region that is mediated by an excitonic coupling between B and Q transition dipoles. In the fluorescence anisotropy spectrum of the aggregate of 1, all Q bands and the red-shifted B band are polarized parallel, reflecting the strong interband excitonic coupling. A qualitative explanation of the observed excitonic effects is given.

• Formation and photoinduced processes of the host–guest complexes of a β-cyclodextrin-conjugated aza-BODIPY and tetrasulfonated porphyrins

  2013

  Chemical Communications · 48 Zitationen · DOI

  A bis(permethylated β-cyclodextrin)-substituted aza-BODIPY has been prepared, which forms stable 1 : 1 host-guest complexes with metal-free and zinc(II) tetrasulfonated porphyrins in water. The resulting complexes exhibit predominantly a photoinduced energy or electron transfer process depending on the porphyrin-based guest.

• Electron donor–acceptor compounds: exploiting the triptycene geometry for the synthesis of porphyrin quinone diads, triads, and a tetrad

  2001

  Tetrahedron · 48 Zitationen · DOI

• advanced polymer compounds

  Solar Collectors made of Polymers

  other

• Arbeitsgemeinschaft Erneuerbare Energie - Institut für Nachhaltige Technologien

  Solar Collectors made of Polymers

  other

• AVENTA AS

  Solar Collectors made of Polymers

  other

• DS Smith Kaysersberg Paper Mill

  Solar Collectors made of Polymers

  other

• Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.

  Solar Collectors made of Polymers

  other

• GREENoneTEC Solarindustrie GmbH

  Solar Collectors made of Polymers

  company

• Hochschule für Technik Rapperswil

  Solar Collectors made of Polymers

  university

• HTCO GmbH - Dr. Axel Müller

  Solar Collectors made of Polymers

  company

• Johannes Kepler Universität Linz

  Solar Collectors made of Polymers

  university

• POLYTEC PLASTICS Ebensee GmbH

  Solar Collectors made of Polymers

  company

• PPI Plastic Products Innovation GmbH & Co KG

  Solar Collectors made of Polymers

  company

• Universität Oslo

  Solar Collectors made of Polymers

  university

Name

Prof. Dr. rer. nat. habil. Beate Röder

Titel

Prof. Dr. rer. nat. habil.

Fakultät

Mathematisch-Naturwissenschaftliche Fakultät

Institut

Institut für Physik

Telefon

+49 30 2093-7612

HU-FIS-Profil

Quelle ↗

Zuletzt gescrapt

26.4.2026, 01:11:07