GAS-PHASE REACTION OF NEUTRAL CARBON-DISULFIDE WITH ITS HYDRIDE ADDUCT ANIONS - TANDEM MASS-SPECTROMETRY AND THEORETICAL-STUDIES

In a chemical ionization source with CH4/N2O, carbon disulfide (CS2) y ields its radical anion by electron capture and CHS2- by hydride attac hment, By combining tandem mass spectrometric experiments and theoreti cal ab initio calculations, we demonstrate that hydride attachment can yield either thioformate anion or thiohydroxythiocarbonyl carbanion w ithout interconversion. The thioformate anion reacts with neutral at C S2 carbon, whereas the syn thiohydroxythiocarbonyl carbanion attacks a t the sulfur site to ultimately form HSCS2- and CS species.