Accession Number : AD0220658

Title :   Microwave spectrum, Structure, Dipole Moment and Nuclear Quadrupole Effects in Vinyl Chloride.

Corporate Author : MALLINCKRODT CHEMICAL LAB HARVARD UNIV CAMBRIDGE MASS

Personal Author(s) : Kivelson ,Daniel ; Wilson,E. Bright ,Jr. ; Lide,David R. ,Jr.

Report Date : 1959

Pagination or Media Count : 19

Abstract : The microwave spectra of nine isotopic species of vinyl chloride have been measured and analysed, yielding moments of inertia from which a molecular structure was calculated. The bond lengths found are (in A) C=C 1.33(2), C-Cl 1.72(6), average C-H 1.08. The bond angles are C2C1Cl 122, C2C1H1 124, C1C2H3 (cis to Cl) 121, C1C2H2 (trans to Cl) 120. Planarity was assumed. The chlorine nuclear quadrupole hyperfine lines were re-examined. From the data for several isotopic species it was shown that the C-C1 bond direction is within five degrees of a principal axis of the field gradient tensor. The lack of cylindrical symmetry of the field gradient about the C-C1 bond was confirmed. This is evidence that the observed shortening of the C-C1 bond is at least in part due to conjugation with the C=C double bond and not solely to hybridization effects. The component of dipole moment along the a inertial axis was found to be 1.42 = 0.02 D. (Author)

Descriptors :   DIPOLE MOMENTS, HYPERFINE STRUCTURE, MICROWAVE SPECTROSCOPY, MOLECULAR STRUCTURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE