DICHLORODIPHENYLANTIMONY(V) DERIVATIVES OF OXOIMIDODIPHOSPHINIC AND THIOIMIDODIPHOSPHINIC ACIDS, CONTAINING NOVEL INORGANIC SBO2P2N AND SBOSP2N RINGS - CRYSTAL AND MOLECULAR-STRUCTURES OF PH(2)SBCL(2)[(OPPH(2))(XPPH(2))N] (X=O,S)

Ph(2)SbCl(2)[(OPPh(2))(XPR(2))N] (X = 0, S; R = Me, Ph) were prepared by metathesis reactions between Ph(2)SbCl(3) and an alkali metal salt of the corresponding imidodiphosphinic acid. All new compounds were ch aracterized by IR, multinuclear NMR and mass spectrometry. The molecul ar structures of Ph(2)SbCl(2)[(OPPh(2))(2)N] (1) and Ph(2)SbCl(2)[(OPP h(2))(SPPh(2))N] (2) were determined by X-ray diffractometry, In both compounds the imidodiphosphinato ligand is coordinated through both ch alcogen atoms to antimony (Sb-O(1) 2.128(3), Sb-O(2) 2.112(3) in (1), and Sb-O(1) 2.113(3), Sb-S(1) 2.614(2)Angstrom in (2)), leading to nov el, non-planar inorganic SbO2P2N and SbOSP2N rings respectively. In bo th cases the coordination geometry around the metal atom is slightly d istorted octahedral, with the phenyl groups in axial positions (C(1)-S b-C(7) 173.5(2) and 176.8(2)degrees in (1) and (2) respectively).