Synthesis and characterization of metal-free phthalocyanine containing 16-membered N2S2-donor macrocycles linked to a 2-pyridinyl methyl moiety

A metal-free phthalocyanine (H2Pc) containing four diazadithiamacrocycles a with 2-pyridinyl methyl groups attached was synthesized via cyclotetramerization of 4,5-bis{2-[13(2-pyridinylmethyl)-1,9-dithia-5,13-diazacyclohexadecanyl-5]ethyl} thiophthalonitrile in the presence of DBU as a strong organic base. New compounds were characterized by a combination of elemental analysis, 1H NMR, 13C NMR, IR, UV/vis, and MS spectral data.