Preparation and Mössbauer spectra of organotin(IV) compounds containing the CH3(C6H5)Sn(IV) moiety

The synthesis and Mössbauer spectra of 16 organotin compounds of the type MePhSnX2 (X = F, Cl), [Et4N]MePhSnCl3, MePhSnCl2L2 (L = oxygen and nitrogen neutral donor ligands), and MePhSnL2′ (L′ = acetylacetonates and 8-hydroxyquinolate) are reported. The Mössbauer quadrupole splittings (qs) are used to assign the structures of the complexes. The MePhSnX2 (X = F, Cl) compounds have similar structures to their Me2Sn analogues, while the six-coordinate complexes show a greater structural similarity to their Ph2Sn analogues. Thus MePhSnF2 is a highly associated structure like Me2SnF2 with a six-coordinate Sn atom; while the MePhSnL2′ complexes have the cis structure like their Ph2Sn analogues. The structures of the six-coordinate organotin complexes are rationalized using steric calculations and the known bonding properties of the ligands. The quadrupole splittings and centre shifts (cs) are also used to suggest variations in ligand bonding properties, and to discuss variations in C—Sn—C angles from the MePhSn complexes to their Ph2Sn analogues.