SiH and GeH stretching frequency variations in rotational conformers of MHCH 2X compounds

Abstract

IR spectra of the species GeHD 2CH 2F and GeHD 2CH 2Cl are reported which show two bands each, assigned to the solitary GeH bond either gauche or trans to the halogen atom, the splittings being 17 cm −1 (F) and 25.5 cm −1 (Cl), respectively. Similar pairs of bands are identified as due to GeHD 2CH 2Br, SiHD 2CH 2Cl and SiHD 2CH 2Br in earlier spectra. This conformational effect of halogen on ν(SiH) or ν(GeH) accounts for the doublets seen earlier in the spectra of R 2MHCH 2Cl and R 2MHCHCl 2 compounds by Egorochkin et al. and alternatively attributed by them to “free”, and “intramolecularly bonded” germanium of the type ▪.