Catalysis with late transition metals

PD Dr. Torsten Beweries

The group investigates fundamental aspects of late transition metal catalysed processes on the basis of synthetic organometallic chemistry with the aim of understanding structure-activity relationships for an optimisation of catalytic reactions. We are focussing on various aspects of activation and transformation of small, partly unreactive molecules such as H2O, N2, CO2, or H2.1

The catalytic bond formation between main group elements was widely investigated in recent years, mainly due to the potential of amine borane adducts for hydrogen storage as well as in the context of development of new functional inorganic materials.2 In our group we are working on dehydrogenation and dehydrocoupling of amine borane adducts such as ammonia borane and its substituted analogues as well as hydrazine borane as model compound for chemical hydrogen storage.3 Moreover, we are investigating the selective oligomerisation and polymerisation of functionalised group3/5 adducts for the synthesis of novel main group based materials. 
 

Bild 1 (An example for a BN based polymer)

 

Transition metal catalysts used in this context are based on PCP and PNP pincer ligand motifs, which are developed in the group and studied with respect to ligand effects and their coordination chemistry.

The group is equipped for working under inert conditions (high vacuum Schlenk lines and two MBraun Labmaster gloveboxes) and holds electrochemical tools (Metrohm), three volumetric systems (Messen Nord, automatic gas burets), that can operate under photochemical conditions, as well as permanent gas GC.

[1]

a) M. Kessler, S. Schüler, D. Hollmann, M. Klahn, T. Beweries, A. Spannenberg, A. Brückner, U. Rosenthal, Angew. Chem. Int. Ed. 2012, 51, 6272. b) S. Hansen, M.-M. Pohl, M. Klahn, A. Spannenberg, T. Beweries, ChemSusChem 2013, 6, 92. c) C. Godemann, L. Dura, D. Hollmann, K. Grabow, U. Bentrup, H. Kiao, A. Schulz, A. Brückner, T. Beweries, Chem. Commun. 2015, 51, 3065. d) L. Dura, J. Ahrens, S. Höfler, M.-M. Pohl, M. Bröring, T. Beweries, Chem. Eur. J. 2015, 21, 13549.  e) C. Godemann, D. Hollmann, M. Kessler, H. Jiao, A. Spannenberg, A. Brückner, T. Beweries, J. Am. Chem. Soc. 2016, 137, 16187.

[2]

T. Beweries, Organometallics for Hydrogen Storage Applications. In: Organometallics and Related Molecules for Energy Conversion, W.-Y. Wong (Ed.), Springer-Verlag Berlin Heidelberg, 2015.

[3]

a) T. Beweries, S. Hansen, M. Kessler, M. Klahn, U. Rosenthal, Dalton Trans. 2011, 40, 7689. b) J. Thomas, M. Klahn, A. Spannenberg, T. Beweries, Dalton Trans. 2013, 42, 14668. d) M. Klahn, D. Hollmann, A. Spannenberg, A. Brückner, T. Beweries, Dalton Trans. 2015, 44, 12103. e) D. Han, M. Joksch, M. Klahn, A. Spannenberg, H.-J. Drexler, W. Baumann, H. Jiao, R. Knitsch, M. R. Hansen, H. Eckert, T. Beweries, Dalton Trans. 2016, 45, 17697.