DIMETHYLGALLIUM-BIS(TRIMETHYLSILYL)PHOSPH ANE, VIBRATIONAL-SPECTRUM, FORCE-CONSTANTS, AND X-RAY STRUCTURE

Dimeric dimethylgallium-bis (trimethylsilyl)phosphane, [Me(2)Ga-P(SiMe (3))(2)](2), (Me = CH3) is synthesized from Me(2)GaCl and P(SiMe(3))(3 ) in hot toluene. The compound crystallizes in the triclinic space gro up P (1) over bar with the cell parameters a = 909.8(2), b = 960.5(2), c = 971.6(2) pm; alpha = 76.75(1)degrees, beta = 80.35(1)degrees, gam ma = 63.94(1)degrees and Z = 1 (dimer). The Ga-P distances are 244.8 a nd 245.2 pm, the ring angles are 91.8 degrees (Ga-P-Ga) and 88.2 degre es (P-Ga-P), respectively. The vibrational spectrum (IR and Raman for the solid) has been measured and assigned; force constants calculation s are carried out for the skeleton [C2Ga-P(SiC3)(2)](2) using Fleischh auers [26] PC-program.