Synthesis and spectroscopic and X-ray structural characterisation of some para-substituted triaryltin(pentacarbonyl)manganese(I) complexes

Abstract

A series of para-substituted triaryltin(pentacarbonyl)manganese(I) compounds [( p- XC 6H 4) 3SnMn(CO) 5: II, X=CH 3; III, X=CH 3O; IV, X=CH 3S; V, X=F; VI, X=Cl; VII, X=CH 3S(O 2)] is reported for comparison with the known phenyl analogue I. IR data [ ν(CO)] as well as complete 119Sn/ 55Mn/ 13C solution NMR results are given for I– VII. Chemical shifts, 119Sn versus 55Mn, except I, correlate well, but have differing single parameter (SP) correlations, 119Sn versus σ I and 55Mn versus σ° p. These results are compared with previous SP studies of the 119Sn solution NMR spectra of the series, ( p- XC 6H 4) 4Sn and ( p- XC 6H 4) 3SnY (Y=Cl, Br, I). Full crystal structures are reported for compounds II– VI. All are similar to that of I, with the Mn(CO) 5 moiety being a distorted tetragonal pyramid, and having a quasi-mirror plane through the central C 4MnSnC 3 skeleton. The Ar 3Sn are distorted trigonal propellers with ring torsion angles in the range 30–80°, the exception being IV with one torsion angle of 22°.