The Vibrational Spectra of Silane and Germane Derivatives. Part IV. The Infrared and Raman Spectra of the Iodo(methyl)germanes

Abstract

The infrared and Raman spectra of the series of iodo(methyl)germanes, CH3GeI3, (CH3)2GeI2, and (CH3)3GeI have been recorded. A normal coordinate analysis based on a modified valence force field confirms the a priori assignments for all of the fundamental frequencies except the torsional modes.

Molecular Structure and Vibrational Spectra of Iodotrimethylgermane (GeIMe3) by Theory and Experiment

“…This band appears by FSD at 843 cm -1 , in agreement with the observation from the LT spectra (Figure ). Previously, only one band was observed in this region, at 840 cm -1 in the infrared spectrum of the liquid, which was also assigned to the ν 19 rocking mode . The feature at 763 cm -1 in both the RTIR and LTIR spectra is due to the ν 20 rocking mode, which appears in the Raman spectrum (760 cm -1 ) as a very weak depolarized band.…”

“… a Units are mdyn Å -1 for stretching and stretching/stretching interactions and mdyn Å rad -2 for deformations and deformation/deformation interactions. b Calculated with the SVFF method, taken from ref . …”

“…The only previous work related to the study of the vibrational spectra of ITMG was performed by Anderson et al as part of the vibrational analyses of halogenated derivatives of (CH 3 ) n GeI 4- n ( n = 1, 2, 3). IR spectra were recorded in the gas and liquid phases, while Raman spectra were obtained in the liquid phase.…”

Bromo(N,N-dimethyldithiocarbamato)dimethylgermanium and (N,N-dimethyldithiocarbamato)iododimethylgermanium

“…A comparison of the spectroscopic data of the three compounds (CH3) 2-GeX[S2CN(CHa)2], X= Cl, Br, I (Chadha, Drake & Sarkar, 1986), indicated that similar distorted trigonal bipyramidal structures might be expected for the bromo and iodo derivatives. In particular, the values of the Ge-Br and Ge-I stretching vibrations were of the order of 80 and 100 cm -1 respectively lower than in the related four-coordinate germanium halide derivatives (CH3)2GeBr 2 and (CH3)2GeI 2 (Anderson, Barker, Drake & Hemmings, 1971;Griffiths, 1964;Van de Vondel, Van der Kelen & Van Hooydonk, 1970). We have completed the crystal structures of bromo(N,Ndimethyldithiocarbamato)dimethylgermanium, (CH3) 2-GeBr[SECN(CHa)2], and (N,N-dimethyldithiocarbamato)iododimethylgermanium, (CH3)EGeI[S2CN-(CH3)2] , which not only confirm the predictions based on spectroscopy but also draw attention to some interesting trends.…”

Studies of silyl and germyl group VI species. Part VI. Synthesis and vibrational spectra of methylthiosilanes

“…The use of complex aluminates as synthetic reagents has been studied considerably (8,19). In this study, these were extended to Li[Al(SCH,),] to include a convenient preparation of a series of methylthiosilanes by the general reaction:…”