Position isomer separation of non-peripheral substituted zinc dibenzo-di(3,4-pyrido)porphyrazines

The cyclotetramerisation products from the 1,8-diazabicyclo[5,4,0]undec-7-e ne catalysed reaction of a 1:1 mol mixture of 3,6-didecylphthalonitrile and 3,4-dicynopyridine in the presence of zinc chloride have been isolated by chromatography. The fractions comprise zinc octadecylphthalocyanine and com pounds in which one, two, three and four pyridinoid rings replace the didec ylbenzenoid moiety. The zinc bis(1,4-didecylbenzo)bis(3,4pyrido)porphyrazin e fraction was separated further into four sub-fractions and the components have been characterised by 400 MHz proton nuclear magnetic resonance spect roscopy, visible region spectroscopy, fluorescence spectroscopy and by cycl ic voltammetry. Copyright (C) 2001 John Wiley & Sons, Ltd.