Die Forschung von Dr. Gudrun Scholz konzentriert sich auf die Synthese, Strukturanalyse und katalytische Anwendung von Fluorid-basierten Materialien, insbesondere Aluminium-Chlor-Fluoride und Koordinationspolymere. Ein zentrales Thema ist die Mechanochemie, bei der mechanische Aktivierung zur Synthese und Modifikation fester Stoffe genutzt wird. Die Charakterisierung erfolgt vorwiegend durch fortgeschrittene spektroskopische Methoden wie Festkörper-NMR und Raman-Spektroskopie sowie Kristallographie. Die entwickelten Materialien dienen als starke Lewis-Superacide für katalytische Reaktionen, etwa die Chlorodefluorierung von Fluoralkanen.
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Dr. rer. nat. Gudrun Scholz
HU-FIS-Profil ↗Zeitraum: 01/2000 - 02/2005 Projektleitung: Dr. rer. nat. Gudrun Scholz
Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 10/2010 - 02/2011 Projektleitung: Dr. rer. nat. Gudrun Scholz
Communications Chemistry · DOI
Abstract Niobium pentoxides are promising acid catalysts for the conversion of biomass into fuels and chemicals. Developing new synthesis routes is essential for designing niobium pentoxide catalysts with improved activity for specific practical processes. Here we show a synthesis approach in acetophenone, which produces nanostructured niobium pentoxides with varying structure and acidity that act as efficient acid catalysts. The oxides have orthorhombic structures with different extents of distortions and coordinatively unsaturated metal atoms. A strong dependence is observed between the type and strength of the acid sites and specific structural motifs. Ultrasmall niobium pentoxide nanoparticles, which have strong Brønsted acidity, as well as Lewis acidity, give product yields of 96% (3 h, 140 °C, 100% conversion), 85% (3 h, 140 °C, 86% conversion), and 100% (3 h, 110 °C, 100% conversion) in the reactions of furfuryl alcohol, 5-(hydroxymethyl)furfural, and α-angelica lactone with ethanol, respectively.
Angewandte Chemie International Edition · DOI
'Al'l about F: Aluminum chlorofluoride (ACF) catalyzes the hydrodefluorination, as well as Friedel–Crafts reactions of fluorinated methanes in the presence of Et3SiH. A surface-bound silylium-ion-like species is considered to be a crucial intermediate in achieving the CF bond cleavage.
Chemistry - A European Journal · DOI
Novel magnesium fluorides have been prepared by a new fluorolytic sol-gel synthesis for fluoride materials based on aqueous HF. By changing the amount of water at constant stoichiometric amount of HF, it is possible to tune the surface acidity of the resulting partly hydroxylated magnesium fluorides. These materials possess medium-strength Lewis acid sites and, by increasing the amount of water, Brønsted acid sites as well. Magnesium hydroxyl groups normally have a basic nature and only with this new synthetic route is it possible to create Brønsted acidic magnesium hydroxyl groups. XRD, MAS NMR, TEM, thermal analysis, and elemental analysis have been applied to study the structure, composition, and thermal behaviour of the bulk materials. XPS measurements, FTIR with probe molecules, and the determination of N(2)/Ar adsorption-desorption isotherms have been carried out to investigate the surface properties. Furthermore, activity data have indicated that the tuning of the acidic properties makes these materials versatile catalysts for different classes of reactions, such as the synthesis of (all-rac)-[alpha]-tocopherol through the condensation of 2,3,6-trimethylhydroquinone (TMHQ) with isophytol (IP).