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Study of the formation of copper phthalocyanine by EPR spectroscopy
Author(s) -
Döscher Burghard,
Priess Renate,
Gunsser Walter
Publication year - 1984
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270221012
Subject(s) - electron paramagnetic resonance , copper , phthalonitrile , phthalic anhydride , phthalocyanine , chemistry , spectroscopy , infrared spectroscopy , photochemistry , inorganic chemistry , organic chemistry , nuclear magnetic resonance , catalysis , physics , quantum mechanics
The mechanism of the formation of copper phthalocyanine in the phthalic anhydride/urea process was elucidated by employing 14 N, 15 N or mixed nitrogen donors and enriched 63 Cu for the synthesis of the pigment. Both EPR spectroscopy of the magnetically dilute complex and IR spectroscopy of oxidative fission products provide information about the isotopic composition of the inner chelate sphere. The range of superhyperfine interaction detectable by the EPR method was analysed by means of copper phthalocyanine labelled with 13 C at positions 1, 4, 6, 9, 11, 14, 16 and 19. The results confirm a reaction mechanism which includes the formation of phthalonitrile as an intermediate product.