Well-resolved resonances are observed in the P-31-CPMAS NMR spectra of (2S,4S)-2,4-bis(diphenylphosphino)pentane or (S,S)-BDPP (1) and its cationic complexes [(Rh{(S,S)-BDPP}(NBD)]BF4 (2a), [Rh{(S,S)-BDPP}(NBD)]PF6 (2b), [Rh{(S,S)-BDPP}-(NBD)]ClO4 (2c) and [Rh{(S,S)-BDPP}(COD)]BF4 (3). Packing forces split the single resonance observed for these systems in solution. The spectral parameters depend remarkably on the counterion in 2a, 2b, and 2c. Complex 3 showed a splitting of every resonance due to the presence of two independent molecules in the unit cell. The complex [Rh{(S,S)-BDPP}(NBD)Cl] (4) showed two broad P-31 resonances which are ascribed to a number of closely related structures based on the expected trigonal bipyramidal geometry.

HIGH-RESOLUTION NMR-STUDIES OF (DIPHOSPHINE)(DIENE)RHODIUM COMPLEXES IN THE SOLID-STATE

AIME, Silvio;GOBETTO, Roberto
1993-01-01

Abstract

Well-resolved resonances are observed in the P-31-CPMAS NMR spectra of (2S,4S)-2,4-bis(diphenylphosphino)pentane or (S,S)-BDPP (1) and its cationic complexes [(Rh{(S,S)-BDPP}(NBD)]BF4 (2a), [Rh{(S,S)-BDPP}(NBD)]PF6 (2b), [Rh{(S,S)-BDPP}-(NBD)]ClO4 (2c) and [Rh{(S,S)-BDPP}(COD)]BF4 (3). Packing forces split the single resonance observed for these systems in solution. The spectral parameters depend remarkably on the counterion in 2a, 2b, and 2c. Complex 3 showed a splitting of every resonance due to the presence of two independent molecules in the unit cell. The complex [Rh{(S,S)-BDPP}(NBD)Cl] (4) showed two broad P-31 resonances which are ascribed to a number of closely related structures based on the expected trigonal bipyramidal geometry.
1993
463
223
226
ASYMMETRIC HYDROGENATION; C-13 NMR; P-31; SPECTROSCOPY; MAGIC ANGLE; CPMAS
Szalontai, G; Bakos, J; Aime, Silvio; Gobetto, Roberto
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/25275
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