Mössbauer and Related Studies of Complexes of R2 Sn(NCS)2 with Neutral Ligands Containing Oxygen Donor Atoms

Abstract

Mössbauer, infrared, and electric dipole moment data are reported for several complexes of the type (i) R2Sn(NCS)2L2 and (ii) R2SnX2B (where R = C4H9, C2H3, C6H5; X = Cl, NCS; L = monodentate ligands with O, S donor atoms; B = bidentate ligands with O, P, As donor atoms). Quadrupole splittings indicate trans C—Sn—C bonds in octahedral complexes of divinyl-and diphenyltin diisothiocyanate with bidentate oxygen-donor ligands, in contrast to a cis configuration for complexes with bidentate nitrogen-donor ligands. Data indicate that the 1:2 complex of 2,2-bipyridyl-N,N′-dioxide with Bu2Sn(NCS)2 is polymeric, with octahedral monomer units having one bridging and one terminal NCS group, a bridging bipyO2 ligand and trans butyl groups. [Ph2Sn(NCS)2]2•bipyO2 appears to be a dimer with a bridging bipyO2 ligand and five-coordinate tin atoms. Mössbauer parameters for R2SnX2L2 and R2SnX2B complexes having oxygen donors are similar.