Dibenzyltin(IV) derivatives of tetraphenyldichalcogeno-imidodiphosphinato ligands. X-ray molecular structures of (C6H5CH2)(2)Sn[(OPPh2)(2)N](2) and (C6H5CH2)(2)Sn[(OPPh2)(SPPh2)N](2)center dot C6H6

(C6H5CH2)(2)Sn[(OPPh2)(2)N](2) (1) and (C6H5CH2)(2)Sn[(OPPh2)(SPPh2)N](2) (2) were prepared from (C6H5CH2)(2)SnCl2 and M[(OPPh2)(XPPh2)N] (M = Na, X = O; M = K, X = S), using methods described previously. The monothio derivative was isolated as a benzene solvate, 2 C6H6, during attempts to grow single crystals from a benzene solution. Both compounds were investigated by Sn-119m Mossbauer spectroscopy and their crystal and molecular structures were determined by single-crystal X-ray diffraction. Both compounds exhibit very similar spiro-bicyclic structures, with the tin atom as spiro atom. The ligand moieties are monometallic biconnective (bidentate) through the chalcogen atoms [1: Sn(1)-O(1) 2.198(8), Sn(1)-O(2) 2.251(8) Angstrom; 2.C6H6: Sn(1)-O(1) 2.217(9), Sn(1)-S(1) 2.719(4) Angstrom]. The coordination geometry around the central metal atom is octahedral, with trans-angles of 180degrees, and cis-angles in the range 87.0-93.0degrees for 1 and 85.3-94.7degrees for 2, respectively. The conformation of the six-membered SnOXP2N (X = O, S) rings is twisted boat.