190129-40-9Relevant academic research and scientific papers
Spectroscopic and crystallographic studies of phosphino adducts of gallium(III) iodide
Brown, Martyn A.,Castro, Jesus A.,Tuck, Dennis G.
, p. 333 - 341 (1997)
The solid state structures of the compounds GaI3·PPh3 and Ga2I6·dppe (dppe = 1,2-bis(diphenylphosphino)ethane) have been determined. For the former, in which the GaI3P core has C3v symmetry, the structure is trigonal, with a = 14.961 (2) A, c = 16.509(3) A, V = 3199.5(4) A3, Z = 6, space group R3. In Ga2I6·dppe, the ligand bridges two GaI3P centres; the structure is monoclinic, a = 10.196(7) A, b = 15.363(1) A, c = 23.027(9) A, β = 98.735(4)°, V = 3565.1(3.2) A3, Z = 4, space group P21/n. The use of 31P NMR spectroscopy shows that GaI3·PPh3 is slightly dissociated in nonaqueous solution, and the effect of adding Ph3P or I- has been investigated. Similar studies with Ga2I6·dppe are also reported. In each system, four-coordination at gallium is dominant; an equally important factor is the dimerization of uncomplexed GaI3 to Ga2I6 in these solutions.
