Compounds containing gallium–silicon bonding: syntheses and X-ray crystal structures of bis-[2(dimethylaminomethyl)phenyl]-[tris(trimethylsilyl)silyl]gallium, Aryl 2GaSi(SiMe 3) 3 and diphenyl-[tris(trimethylsilyl)silyl]gallium, Ph 2GaSi(SiMe 3) 3 · THF

Abstract

The preparation and characterization of two new compounds with gallium–silicon interatomic interactions are described. The single crystal X-ray diffraction structure of bis-[(2-dimethylaminomethyl)phenyl]-[tris(trimethylsilyl)silyl]gallium, Aryl 2GaSi(SiMe 3) 3 (Aryl=(2-dimethylaminomethyl)phenyl) ( 1) and diphenyl-[tris(trimethylsilyl)silyl]gallium tetrahydrofuranate, Ph 2GaSi(SiMe 3) 3 · THF ( 2), are described. Each compound is obtained from the reaction between LiSi(SiMe 3) 3 · 3THF and R 2GaCl (R=Aryl for ( 1) and R=Ph for ( 2)). ( 1) crystallizes in the monoclinic space group P2 1/ m, Z=4, a=9.0283(2), b=30.8751(6), c=12.3403(3) Å, β=104.4160(10)°. The gallium atom is four-coordinate, surrounded by two carbon atoms, a silicon atom and a nitrogen atom stemming from one of the amine ‘arms’ of one of the 2-(dimethylaminomethyl)phenyl ligands; 2 crystallizes in the triclinic space group P 1 , Z=2, a=9.51000(10), b=12.94050(10), c=13.1823(2) Å, α=78.7750(10)°, β=83.30°, γ=79.4740(10)°. The gallium atom is four-coordinate, bonding to two carbon atoms, a silicon atom and the THF-oxygen, in a near tetrahedral geometry. Both compounds, 1 and 2, are monomeric in the solid state.