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

A series of para-substituted triaryltin(pentacarbonyl)manganese(I) compounds [(p-XC6H4)(3)SnMn(CO)(5): II, X=CH3; III, X = CH3O; IV, X = CH3S; V, X = F; VI, X = Cl; VII, X = CH3S(O-2)] is reported for comparison with the known phenyl analogue I. IR data [v(CO)] as well as complete Sn-119/Mn-55/C-13 solution NMR results are given for I-VII. Chemical shifts, Sn-119 versus Mn-55, except I, correlate well, but have differing single parameter (SP) correlations, Sn-119 versus sigma(1) and Mn-55 versus sigma(p)(o). These results are compared with previous SP studies of the Sn-119 solution NMR spectra of the series, (p-XC6H4)(4)Sn and (p-XC6H4)(3)SnY (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 C4Mn-SnC3 skeleton. The Ar3Sn are distorted trigonal propellers with ring torsion angles in the range 30-80degrees, the exception being IV with one torsion angle of 22degrees. (C) 2001 Elsevier Science B.V. All rights reserved.