Experimental and theoretical studies on bis(chlorocarbonyl)trisulfane, ClC(O)SSSC(O)Cl
作者:Yeny A. Tobón、Melina V. Cozzarín、Carlos O. Della Védova、Rosana M. Romano
DOI:10.1016/j.molstruc.2009.04.025
日期:2009.7
Bis(chlorocarbonyl)trisulfane, ClC(O)SSSC(O)Cl, was prepared by the reaction of (CH3)(2)CHOC(S)SC-(S)OCH(CH3)(2) and SO2Cl2 at 65 degrees C. The compound was characterized and identified by vibrational spectroscopy, GC-MS, matrix isolation and photochemical studies as well as by quantum chemical calculations. Matrix photochemical studies and vibrational spectra were interpreted in terms of the presence of three forms with syn-gauche-gauche-syn (I), syn-(-)gauche-gauche-syn (II), and syn-gauche-gauche-anti (III) conformations. The syn and anti conformations correspond to the orientation of each C=O group with respect to the adjacent S-S bond, while the gauche form refers to the conformation around each of the S-S bond. This result is in agreement with quantum chemical calculations which predict structures II and III to be higher in energy than conformer I by about 1.51/0.98 and 2.52/2.84 kcal/mol for the B3LYP/MP2 approximations in combination with the 6-31+G* basis set. An assignment of the liquid IR and Raman spectra is proposed for ClC(O)SSSC(O)Cl, as well as the possible mechanisms of the photolysis in Ar and N-2 matrices. The presence of ClC(O)SSCl as a photochemical product opens the possibility of further investigations for this family. (C) 2009 Elsevier B.V. All rights reserved.