Abstract: | Preparation and Characterization of Thiocyanate Derivatives of the Hydroborate Anions B10H102? and B12H122? The reaction of B10H102? or B12H122? with (SCN)2 in dichloromethane yields mixtures of thiocyanatohydroborates from which the pure isomers 1-and 2-(SCN)B10H92?, 1, 10-(SCN)2B10H82?, and 1-(SCN)B12H112? are isolated by ion exchange chromatography on diethylaminoethyl cellulose. The structures are determined by 11B and 11B{1H}NMR spectroscopy. There are characteristic chemical shifts due to apical and equatorial substituents, respectively. In B10H102? the substitution at apical positions is prefered. The IR and Raman spectra are similar to those of isosteric halogeno derivatives in the region of ν(BH) and of the borate cages. Because of the high frequencies of ν(CN): 2120–2140 cm?1 S coordination of SCN? is supposed. |