Synthesis and characterization of compounds containing the As(SiMe3)2 bridging group: Crystal structures of [tBu2GaAs(SiMe3)2]2 and tBu2GaAs(SiMe3)2Ga(tBu)2Cl

^tBu2GaCl reacts with LiAs(SiMe3)2·2thf (1:1 mole ratio) to yield I, which on reaction with ^tBu2GaCl (1:2 mole ratio) affords II quantitatively. [^tBu2GaAs(SiMe3)2]2 (I) and ^tBu2GaAs(SiMe3)2Ga(^tBu)2Cl (II) were not produced from reaction mixtures of ^tBu2GaCl with (Me3Si)3As (1:1 and 2:1 mole ratio mixtures) and only starting materials were recovered. Compound II is the fifth example of a compound containing the GaAsGaX (X = Cl, Br) core, and the second wherein the organogallium four-membered ring with arsenic, halogen mixed-bridging is not puckered. In addition to partial elemental analyses and NMR spectroscopic characterization data, the molecular structures of I and II have been elucidated by single-crystal X-ray diffraction methods. Crystal data I: monoclinic, space group C2/m(C³2h), a = 18.188(2) Å, b = 13.017(1) Å, c = 9.916(1) Å, β = 118.54(1)°, V = 2062.4(8) ų, Z = 2; II: monoclinic, space group C2/c(C⁶2h), a = 20.872(4) Å,b = 9.798(1) Å,c = 19.397(4) Å, β = 124.13(2)°, V = 3284(2) ų, Z = 4. © 1992.

Duke Scholars

Author Andrew T. McPhail Chemistry