A synthetic approach to asymmetric phthalocyanines with peripheral metal-binding sites

  • Haas M
  • Liu S
  • Neels A
 et al. 
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Abstract

A phthalonitrile derivative 1, functionalized with two pyridyl groups, undergoes a cyclotetramerization reaction to afford the symmetric metal-free phthalocyanine 2 with peripheral metal-binding sites. In view of its insufficient solubility in or- ganic solvents, a synthetic route to asymmetric peripherally octasubstituted Pcs, which contain a combination of 2,3-di(2- pyridyl)pyrazino and p-pentylphenoxy or p-(tert-butyl)phen- oxy substituent groups, has been developed. The compounds 5–9 were synthesized by a statistical condensation reaction between two different phthalonitriles, and remarkably, all of them have been isolated and characterized as single com- pounds. For structural characterization, an X-ray study of the asymmetric Zn phthalocyanine 11 is given.

Author-supplied keywords

  • Asymmetric phthalocyanines
  • N ligands
  • Solid-state structures
  • Synthesis
  • UV/Vis spectroscopy

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