First functionalized diorganotin (IV) derivative containing the imidobis(diphenylselenophosphinate-Se,Se′) ligand. The synthesis and X-ray crystal structures of Bu2Sn[{N(SePPh2) 2-Se,Se′}2] and Ph2ClSn[N( SePPh2) 2-Se,Se′] · H2O

Article abstract of DOI:10.1016/S0022-328X(97)00340-9

Reaction of the appropriate R₂SnCl₂ with the potassium salt of the imidobis(diphenylselenophosphinate-Se,Se′) ligand (1c) in 1:2 stoichiometry yields n-Bu₂Sn[{N(SePPh₂)₂-Se,Se′}₂] (2) and Ph₂ClSn[N(SePPh₂)₂-Se,Se′] · H₂O (3). The crystal and the molecular structures of both compounds were determined by X-ray diffractometry. The core geometry in compound 2 is a quasi perfect octahedron. Two selenide ligands are coordinated symmetrically to the tin atom forming a spiro-bicyclic NP₂Se₂SnSe₂P₂N system [ Σ(Se-Sn-Se) = 360°]. Both organo substituents are in trans positions [(C′-Sn-C′A) = 180.0(1)°] and they are almost perpendicular to the SnSe₄ plane. In derivative 3 only one selenium-based ligand is coordinated asymmetrically to the tin atom and unexpectedly a chlorine atom remains attached to the metal center. The geometry around the tin atom corresponds to a distorted trigonal bipyramid with the Se(1) and Cl atoms at the axial positions.