Author(s): Zvezdanović Jelena B. | Marković Dejan Z. | Milenković Sanja M.
Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139
Volume: 77;
Issue: 2;
Start page: 187;
Date: 2012;
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Keywords: pheophytin | mesoporphyrin | heavy metal | complexes | UV-B kinetics
ABSTRACT
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.
Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139
Volume: 77;
Issue: 2;
Start page: 187;
Date: 2012;
VIEW PDF
DOWNLOAD PDF Original pageKeywords: pheophytin | mesoporphyrin | heavy metal | complexes | UV-B kinetics
ABSTRACT
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.
