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Structural Considerations of Meso ‐Substituted Zinc Tetrabenzporphyrins by Liquid Secondary Ionization Mass Spectroscopy
Author(s) -
Carlson Joel B.,
Vouros Paul
Publication year - 1996
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199612)31:12<1403::aid-jms436>3.0.co;2-u
Subject(s) - chemistry , ion , polyatomic ion , mass spectrometry , substituent , zinc , ionization , analytical chemistry (journal) , electron ionization , spectroscopy , electron affinity (data page) , molecule , stereochemistry , organic chemistry , chromatography , physics , quantum mechanics
Metallotetrabenzporphyrins are being extensively investigated because of their large and rapid non‐linear optical response. This non‐linear optical response, which has potential applications in the fields of optical communications and optical data processing, varies relative to the structural characteristics of the meso ‐substituted metallotetrabenzporphyrin. A group of meso ‐substituted zinc tetrabenzporphyrins (ZnTBP) were evaluated by liquid secondary ion mass spectrometry (LSIMS). The ionization of these highly symmetrical, charged/neutral complexes produces a stable odd‐electron molecular ion (M +• ) and fragments representing the loss of up to three meso ‐substituents. The number of fragments and their ratio relative to that of the molecular ion is related to the electron‐withdrawing or electron‐donating characteristics of the meso ‐substituent. The observed isotope ratios of the molecular ion as well as the fragments are consistent with calculated isotope ratios. No LSIMS‐induced reduction of the zinc ion was observed with the tetrabenzporphyrins.