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Electron-impact spectra of ms-tetra-phenylchlorins and the stability of chlorins

✍ Scribed by M. Meot-Ner; A. D. Adler; J. H. Green

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
186 KB
Volume
7
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

The mass spectrum of ms‐tetraphenylchlorin was observed to contain a significant porphyrin peak. Attempts to obtain metallochlorin spectra yeilded mainly metalloporphyrin spectra. Sublimation experiments established that the chlorin to porphyrin conversion resulted from electron‐impact excitation and did not arise from thermolysis on the probe or from impurities. In conjunction with previous literature data, this is interpreted as showing that the apparent stability of chlorins with respect to porphyrins is mainly a matter of the activation energies required under specific constraints.

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