Macrocyclic porphyrazine-type compounds, metal derivatives thereof and process for their preparation

Abstract

The invention relates to new macrocyclic phthalocyanine-like systems. In particular, object of the invention are new macrocyclic porphyrazine-type compounds and metal derivatives thereof, in which heterocycle rings are provided at the periphery of the inner porphyrazine fragment. A further object of the invention is a process for obtaining, as an example, tetra(thiadiazolo)porphyrazine, or tetra(selenediazolo)porphyrazine, by means of cyclotetramerization of the monomers 3,4-dicyano-1,25-thiadizole, or 3,4-dicyano-1,2,5-selenodiazole with metallorganico or inorganic salts, in organic solvents, extraction, if any, of the metal from the complexes thus formed by treatment with strong acids to obtain tetra(thiadiazolo)porphyrazine, or tetra(selenediazolo)porphyrazine, and by treatment, if any, of these compounds with a metallorganic or inorganic salt to obtain the metal derivatives thereof different from those previously extracted.

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