A novel unsymmetrical metal‐free phthalocyanine with a nitro group as an acceptor substituent and three t‐butyl groups as donor groups, namely nitro‐tri‐t‐butylphthalocyanine (NtBuPc) was synthesized for the first time by mixed condensation of two corresponding diiminoisoindolines. The NtBuPc can be separated by common column chromatography on silica gel using chloroform‐hexane as the elution solvent. The structure was confirmed by elemental analysis, nmr, uv‐vis, ir and mass spectroscopy. No contamination of either symmetrical or other related phthalocyanines was observed.
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Liu et al. (1994) studied this question.
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