DIMERIC GALLIUM AND INDIUM DIALKYLPHOSPHIDO COMPLEXES WITH UNUSUAL GROUP 13-15 STOICHIOMETRIES

Three group 13 dialkylphosphido complexes have been prepared with group 13-15 stoichiometries of 1:2, [t-Bu(i-Pr2P)Ga(A-P-i-Pr2)]2 (1) and [i-Pr(i-Pr2P)In(mu-P-i-Pr2)]2 (2), and 2:3, [t-Bu(i-Pr2P)Ga(mu-P-i-Pr2)2Ga(Cl)t-Bu] (3). These complexes were prepared in moderate yields via the reaction of the appropriate lithium dialkylphosphide and alkyl group 13 halide in the desired stoichiometric ratio. Each compound has been characterized by elemental analysis, H-1 and P-31 NMR, and mass spectroscopy. The structures of 2 and 3 were established by X-ray crystallography. Crystal data for 2: space group P2(1)/c, a = 11.283(1) angstrom, b = 11.429(5) angstrom, c = 15.836(3) angstrom, beta = 104.19(1)-degrees, V = 1980(6) angstrom3, Z = 4, R = 0.0401. Crystal data for 3: space group P2(1)/c, a = 18.453(4) angstrom, b = 9.516(2) angstrom, c = 20.745(4) angstrom, beta = 106.88(3)-degrees, V = 3486(2) angstrom3, z = 8, R = 0.0551. Both compounds feature structures with four-membered M2P2 rings.