INFRARED-SPECTRUM OF THE INTRA-MOLECULAR HYDROGEN-BONDED CHLOROFORM ANION CL--HCCL2 IN SOLID ARGON AT 15-K

The matrix photoionization products of chloroform, including its deuterium and 13C isotopes, and the CHCl2Br and CHCI2I compounds have been studied by infrared spectroscopy. The anion product exhibits isotopic data appropriate for a single H, single C, and two equivalent CI atom species, while bromine and iodine substitution data indicate the involvement of a third inequivalent halogen atom; these observations identify the Cl--HCCl2 anion, which is produced upon electron capture by chloroform. The infrared spectrum containing vs, 2vb, vb, and vx clearly demonstrates the effect of hydrogen bonding in Cl--HCCl2, which decreases in the Br--HCCl2 and I--HCCh anions. © 1979, American Chemical Society. All rights reserved.