Research Article: Tetra­bromidobis(dicyclo­hexyl­phosphane-κP)digallium(Ga—Ga)

Date Published: October 01, 2012

Publisher: International Union of Crystallography

Author(s): Dennis H. Mayo, Yang Peng, Peter Zavalij, Kit H. Bowen, Bryan W. Eichhorn.


The title compound, a GaII dimer, [Ga2Br4(C12H23P)2], was synthesized by reaction of GaBr(THF)n (THF is tetra­hydro­furan) with dicyclo­hexyl­phosphine in toluene. At 150 K the crystallographically centrosymmetric molecule exhibits disorder in which one of the two independent cyclo­hexyl groups is modelled over two sites in a 62 (1):38 (1) ratio. In d6-benzene solution, the compound exhibits virtual C2h symmetry as determined by 1H NMR. The coordination environment of the GaII atom is distorted tetrahedral.

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For references related to the synthesis of the ‘GaBr’ precursor and to cluster formation, see: Schnoeckel (2010 ▶); Steiner et al. (2004 ▶). For other Ga—Ga containing compounds, see: Baker et al. (2003 ▶) (the analogous digallium tetra­iodide compound); Uhl et al. (1989 ▶) [the first-reported Ga(II) dimer compound].