Raman spectra of seleninyl halides

Article abstract of DOI:10.1016/0584-8539(82)80148-7

The Raman spectra of selenium oxide difluoride, dichloride, dibromide, chloride fluoride and bromide chloride have been measured in solid and liquid phases and in solution in acetonitrile (MeCN).In all cases, as the state of molecular aggregation increases, the SeO strethcing frequency falls, indicating the formation of oxygen bridges.Vibrational assignments are given for selenium oxide dibromide, bromide chloride and chloride fluoride and force constants have been calculated for all of the selenium halides.The degree of formation of selenium oxide fluoride from selenium oxide dichloride and difluoride is shown to be less than that of selenium oxide bromide chloride from the dibromide and dichloride and this is attributed to the importance of the back bonding mechanism in SeF bonds, which favours increased SeF bond strength when the secondd halogen is fluorine instead of chlorine, a mechanism which is not as significant for SeCl and SeBr bonds.