Accession Number : AD0742588

Title :   The Mass Spectra of Polychlorinated Biphenyls,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA HALIFAX (NOVA SCOTIA) ATLANTIC REGIONAL LAB

Personal Author(s) : Safe,S. ; Hutzinger,O.

Report Date : 17 SEP 1971

Pagination or Media Count : 7

Abstract : The mass spectra of several di- and tetra-chlorobiphenyls suggested randomization of chlorine over both phenyl rings in the molecular ion prior to fragmentation. The exceptions, 2,2'- and 2,6-dichloro-, 2,2',4,4'-,2,2',5,5'-, 2,3,5,6-, and 2,2',6,6'-tetrachloro-biphenyls, all contain two or more chlorine atoms ortho to the Ph--Ph bond and their metastable ion intensities which result from the M to M - Cl2 reaction are markedly different from those of the other isomers. The primary ion spectra of most isomeric compounds are similar, with successive losses of Cl radical from the molecular ion. This process is often accompanied by expulsion of HCl from the lower chlorine homologues. The ion kinetic energy spectra of the di- and tetra-chloroisomers confirm the suggested fragmentation pathways. (Author)

Descriptors :   (*BIPHENYL, MASS SPECTRA), (*HALOGENATED HYDROCARBONS, *MASS SPECTRA), CHLORINE COMPOUNDS, GAS IONIZATION, CHEMICAL BONDS, DISSOCIATION, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE