Transition metal NMR chemical shifts and polarizability effect in organometallic complexes.

ABSTRACT

The literature data on substituent influence on the (51)V, (55)Mn, (57)Fe, (59)Co, (61)Ni, (95)Mo, (103)Rh, (183)W, (187)Os and (195)Pt NMR chemical shifts (delta) and on J (M, P; M = Mn, Fe, Mo, Rh, W, Os) coupling constants have been analyzed for 30 series of the organometallic complexes. It has been established for the first time that the delta and J values depend on the inductive, resonance and polarizability effects of substituents. The polarizability effect is caused by the partial charge on the central M atom. The contribution of this effect ranges from 3 to 86%.