Ligand behaviour of P-functional organotin halides: Nickel(II), palladium(II), and platinum(II) complexes with Me-2(Cl)SnCH2CH2PPh2

Me-2(Cl)SnCH2CH2PPh2 (1) reacts with Ni-II, pd(II) and Pt-II halides in mol ar ratio 2:1 forming the complexes [MX2{PPh2CH2CH2Sn(Cl)Me-2}(2)] (M=Ni, Pd , Pt; X=Cl, Br) (3-6, 9, 10) (7, 8: M = Ni; Br instead of Cl). The nickel c omplexes were isolated and characterized both as the planar (3, 5, 7) and t he tetrahedral (4, 6, 8) isomer. Crystal structure analyses and NMR data in dicate for the planar nikkel complexes 3, 5, 7 and [MCl2{PPh2CH2CH2Sn(Cl)Me -2}(2)] (9: M = Pd; 10: M = Pt) the existence of intra and intermolecular M -Hal ... Sn bridges. In a ligand:metal molar ratio of 3:1 the complexes [MCl{PPh2CH2CH2Sn-Cl2Me2}-{PPh2CH2CH2Sn(Cl)Me-2}(2)] (11: M = Pd; 12: M = Pt) are formed which represent intramolecular ion pairs. By dehaloge nation of [PdCl2{PPh2CH2CH2Sn(Cl)Me-2}(2)] (9) with sodium amalgam and graphite pota ssium (C8K), respectively, the palladacycles cis-[Pd{PPh2CH2CH2SnMe2}(2)] ( 13) and trans-[Pd(Cl)PPh2CH2CH2SnMe2{PPh2CH2CH2Sn(Cl)Me-2}] (14) are formed . From the compounds 1, 3, 9, 11, and 12 the crystal structures are determi ned. All compounds are characterized by H-1, P-31 and Sn-119 NMR spectrosco py.