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

Three group 13 dialkylphosphido complexes have been prepared with grou p 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 gr oup 13 halide in the desired stoichiometric ratio. Each compound has b een characterized by elemental analysis, H-1 and P-31 NMR, and mass sp ectroscopy. The structures of 2 and 3 were established by X-ray crysta llography. Crystal data for 2: space group P2(1)/c, a = 11.283(1) angs trom, 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) angstrom 3, z = 8, R = 0.0551. Both compounds feature structures with four-memb ered M2P2 rings.