Microwave assisted synthesis and characterization of novel metal-free and metallophthalocyanines containing four pyridyl groups

The novel tetrasubstituted metal-free phthalocyanine (4) and metallophthalocyanines (5, 6, 7 and 8) bearing four pyridyl group moieties on peripheral positions have been synthesized by cyclotetramerization of the phthalonitrile derivative (3) in a multi-step reaction sequence. The new compounds were characterized by a combination of elemental analysis, ¹H- and ¹³C-n.m.r., i.r., U.V.–vis and m.s. spectral data.