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Steric Influences on the 103 Rh NMR Chemical Shifts of Rhodium(III) Half‐Sandwich Complexes
Author(s) -
Tedesco Vanda,
von Philipsborn Wolfgang
Publication year - 1996
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199605)34:5<373::aid-omr885>3.0.co;2-0
Subject(s) - rhodium , chemistry , steric effects , phosphine , ligand (biochemistry) , aryl , chemical shift , stereochemistry , medicinal chemistry , organic chemistry , catalysis , receptor , biochemistry , alkyl
Rhodium‐103 and phosphorus‐31 chemical shifts and Rh,P coupling constants are reported for 59 rhodium complexes of the types RhCp*X 2 (PR 3 ) (Cp* = C 5 Me 5 ; X = Cl, Br, I; PR 3 = PMe 3 , P i Pr 3 , P n Bu 3 , PPh 3 , PMePh 2 , PMe 2 Ph), RhCp*X(PR 3 )Ph (X = Cl, Br, I, PR 3 = PMe 3 , PMe 2 Ph, PMePh 2 , PPh 3 ), RhCp*Br(PR 3 )(aryl), and of miscellaneous mono‐ and dinuclear types. Rhodium shielding generally decreases as the steric requirement of the phosphine increases and a number of linear correlations with the Tolman cone angle of the phosphine ligand are reported. Variable para substitution on the aryl ligand has little effect on rhodium shielding.