Reactions of GaX3 (x  br,i) with AS(SiMe3)3; crystal structures of I3Ga · as(SiMe3)3 and [I2GaAS(sime3)2]2

Reactions of GaX₃ (X ? Br, I) with As(SiMe₃)₃ in 1:1 and 2:1 mole ratios were investigated. For the latter reactant stoichiometry, substances having the empirical formulae AsBr₃Ga₂ (1) and Asl₃Ga₂ (2), the analogues of the previously reported single-source GaAs precursor (AsCl₃Ga₂)_n, were isolated as yellow isolated as yellow insoluble powders. Low-temperature reactions in a 1:1 mole ratio resulted in the isolation of the adducts Br₃Ga.As(SiMe₃)₃ (3) and I₃Ga.As(SiMe₃)₃ (4). On the other hand, at room temperature the GaBr₃ reaction resulted in a complex mixture from which no characterizable compounds were isolated, whereas the Gal₃ reaction afforded the crystalline compound [I₂GaAs(SiMe₃)₂]₂ (5). The structures of 4 and 5 were elucidated by complete single-crystal X-ray analysis (crystal data: 4, monoclinic, space group P2₁/c, a = 16.497(2) Å, b = 9.629(1) Å, c = 16.658(2) Å, β = 113.21(1)°, V = 2432(1) ų, Z = 4; 5, orthorhombic, space group Pbca, a = 14.279(2) Å, b = 17.509(2) Å, c = 13.818(2), Å, V = 3455(1) ų, Z = 4).