Steric Influences on the 103Rh NMR Chemical Shifts of Rhodium(III) Half-Sandwich Complexes

✍ Scribed by Vanda Tedesco; Wolfgang von Philipsborn

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 382 KB
• Volume: 34
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/(sici)1097-458x(199605)34:5<373::aid-omr885>3.0.co;2-0

✦ Synopsis

Rhodium

-103 and phosphorus-31 chemical shifts and Rh,P coupling constants are reported for 59 rhodium complexes of the types RhCp*X,(PR,) (Cp* = C,Me,; X = CI, Br, I; PR, = PMe,, P'Pr,, P"Bu,, PPh,, PMePh, , PMe,Ph), RhCp*X(PR,)Ph (X = CI, Br, I, PR, = PMe, , PMe,Ph, PMePh, , PPh,), RhCp*Br(PR,)(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.