Solid State NMR Studies on Al/N- and Al/P-based frustrated Lewis pairs.

DFG-SFB858 Project A2


Goals:
- Characterization of covalent interactions between the Lewis centers
- Measurement of Al-N and Al-P distances
- Characterization of FLP reaction products
- Validation of DFT calculations.

Challenges:
- Extremely broad 14N and 27Al NMR lineshapes
- Design and analysis of double resonance experiments with wideband excitation
- Dipolar analysis involving quadrupolar nuclei

Experimental and simulated 27Al and 71Ga NMR spectra of intramolecular Al/P and Ga/P FLPs
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Publications (originating from previous SFB project A1):

Chemistry of a Non-Interacting Vicinal Frustrated Phosphane/Borane Lewis Pair, L.-M. Elmer, G. Kehr, C. G. Daniliuc, M. Siedow, H. Eckert, M. Tesch, A. Studer, K. Williams, T. H. Warren, G. Erker, Chem. Eur. J., 23, 6056-6068 (2017).

Aminoxyl Radicals of Intermolecular B/P Frustrated Lewis Pairs: Refinement of the Spin-Hamiltonian Parameters by Field- and Temperature Dependendent Pulsed EPR Spectroscopy, M. de Olivera Jr., R. Knitsch, G. Erker, C. J. Magon, G. Jeschke and H. Eckert, PLOS ONE 11, 0157944 (2016).

Solid-state EPR Strategies for the Structural Characterization of Paramagnetic NO Adducts of Frustrated Lewis Pairs (FLPs), M. de Olivera Junior, T. Wiegand, L.-M. Elmer, M. Sajid, G. Kehr, G. Erker, C. J. Magon, H. Eckert, J. Chem. Phys. 142, 124201(1-12) (2015).

Structural Characterization of Frustrated Lewis Pairs and their Reaction Products Using Modern Solid State NMR Techniques, T. Wiegand, M. Siedow, H. Eckert, G. Kehr, G. Erker, Isr. J. Chem., 55, 150-178 (2015)