Fly ash as raw material for the synthesis of zeolite-encapsulated porphyrazine and metallo porphyrazine tetrapyrrolic macrocycles

In this work, free-base thioethyl-porphyrazine and its copper (II) complex were encapsulated into zeolites during their synthesis by hydrothermal method at low incubation temperature (45 °C and 60 °C) using fly ash as raw material. The zeolite-included tetrapyrroles, H2(OESPz)-Zeo and Cu(OESPz)-Zeo, were characterized by XRD, SEM, TG/DTA and UV–Vis. X-ray diffraction patterns show that large amount of zeolite A and sodalite formed in H2(OESPz)-Zeo and Cu(OESPz)-Zeo, respectively whereas thermal analysis as well as UV–Vis spectroscopic investigation reveal the presence of tetrapyrroles inside newly-formed zeolitic solid matrix. The mechanism of zeolite synthesis around organic compounds to form “ship in a bottle” complexes is displayed by SEM analysis