Affiliations: Department of Chemistry, Paul M. Gross Chemical Laboratory, Duke University, Durham, North Carolina 27708-0346 | Department of Chemistry, Venable Hall, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27514
Abstract: The first four-membered ring compound containing two gallium atoms bridged by two different Group 15 elements. I2GaAs(SiMe3)2Ga(I) 2P(SiMe3)2 (l), to be completely characterized was synthesized by both the equilibration of [I2GaAs(SiMe3)2]2 (2) and [I2GaP(SiMe3)2]2 (3) in a 1 : 1 mole ratio and the direct reaction of GaI3 with As (SiMe3)3 and P(SiMe3)3 in a 2 : 1 : 1 mole ratio. Single-crystal X-ray structures were determined for both 1 and 3. Crystals of 1 belong to the orthorhombic system, space group Pbca, with a = 17.349 (3), b = 13.9187(21),c = 13.7570(24)Å, V = 3322.0(10) Å3, Dcalc = 1.879 g cm−3, for Z = 4; the average Ga-As/P bond length is 2.44 Å, and crystals of 1 are isomorphous with those of 2. Crystals of 3 belong to the monoclinic system, space group P21/c, with a = 11.040(9), b = 10.228(4), c = 19.619(9) Å V = 2169.4(22) Å3, Dcalc= 1.816 g cm−3 for Z = 4; the average Ga-p bond length is 2.39 Å.
