Michael J. Cook, Martin J. Heeney

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74 Scopus citations


4-Bromo- and 4,5-dibromo-3,6-dibutoxyphthalonitrile have been prepared and treated with 3,6-didecylphthalonitrile in cross tetramerisation reactions in the presence of nickel acetate to afford monobromo- and dibromo-dibutoxyhexadecylphthalocyaninato nickel(n) complexes. Sonogashira and Stille coupling reactions on these compounds displaced the bromine substituents by ethynyl groups. Oxidative coupling of the monoethynyl derivatised nickel phthalocyanine afforded a butadiynyl-linked dinuclear phthalocyanine. The corresponding coupling reaction of the diethynylated phthalocyanine gave a mixture of phthalocyaninodehydroannulenes. Separation of the mixture yielded the diphthalocyaninodehydro[12]annulene as the major product. Electrospray mass spectrometry provides evidence for its aggregation in solution. The corresponding cyclic trimer, the triphthalocyaninodehydro[18]annulene, has been identified as a minor product. Both compounds show a large splitting of the Q-band absorption in the visible region spectrum. Most of the mononuclear phthalocyanine precursors exhibit discotic liquid crystal behaviour. The diphthalocyaninodehydro[12]annulene also enters a mobile phase on heating, but undergoes an irreversible change at 220°C. MALDI-TOF mass spectrometry of the product reveals that the compound undergoes oligomerisation at this temperature.
Original languageEnglish (US)
Pages (from-to)3958-3967
Number of pages10
JournalChemistry - A European Journal
Issue number21
StatePublished - Nov 3 2000
Externally publishedYes

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ASJC Scopus subject areas

  • General Chemistry


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