SYNTHESIS, NUCLEAR-MAGNETIC-RESONANCE SPE CTRUM, INFRARED-SPECTRUM, RAMAN-SPECTRUM, NORMAL-COORDINATE ANALYSIS AND AB-INITIO CALCULATIONS OF 1,1-DIIODODISILANE AND 1,1-DIIODODISILANE-D(4)

1,1-Diphenyldisilane and 1,1-diphenyldisilane-d(4) react with liquid h ydrogen iodide forming the iododisilanes I2HSiSiH3 and I2DSiSiD3. The IR and Raman spectra have been recorded for the liquid phases. Assiste d by ab initio calculations, the vibrational spectra have been assigne d using C-s symmetry, and the results of normal coordinate calculation s are discussed. Scaled and unsealed ab initio frequencies and harmoni c force constants for IH2SiSiH3, I2HSiSiH3 and I3SiSiH3 are reported. The Si-29 spectrum of 1,1-diiododisilane has been recorded and the (Si Si)-Si-29-Si-29 coupling constant has been measured. (C) 1997 Elsevier Science B.V.