Abstract

The mass spectra of some chlorinated copper phthalocyanines have already been reported. These observations suggested that at least two processes were occurring, namely electron-impact-induced dissociation and thermal depolymerization. The combined effect of these yielded the mass spectrum that comprised the parent molecular ion, a composite ion which represents one quarter of the molecule with a copper atom attached, and halogenated phthalonitrile ions together with some fragments corresponding to halogen atoms. Even if the parent molecular ion is absent, as happens with highly substituted compounds, a partial structure may be deduced from a consideration of the phthalonitrile ions produced by the depolymerization. Each molecule of phthalocyanine depolymerizes to yield four phthalonitrile molecules.

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