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Stability of Zn(II) and Cu(II) complexes of porphyrin derivatives (pheophytin  and mesoporphyrin) to UV-B -irradiation has been studied by absorbance  spectroscopy in 95% ethanol. The chosen porphyrins as well as their heavy  metal complexes undergo photochemical decomposition obeying first-order  kinetics. In general, pheophytin is more stable than mesoporphyrin to UV-B  irradiation. On the other hand, stability of Zn(II)-complex is smaller than  Cu(II)-complex both for pheophytin and mesoporphyrin; however while  Cu(II)-complex with pheophytin is more stable than the one with  mesoporphyrin, with Zn(II)-complex the situation is vice versa

Zinc(II) and copper(II) complexes with pheophytin and mesoporphyrin and their stability to UV-B irradiation: Vis spectroscopy studies