Solvent effect on the photogeneration of singlet molecular oxygen by copper tetra(tert-butyl)phthalocyanine

The photogeneration of the singlet molecular oxygen ( 1 O 2 ) by copper tetra(4- tert -butyl) phthalocyanine in organic solvents of different nature was substantiated. The apparent quantum yields of 1 O 2 in benzene and pyridine were determined. The data obtained indicate an influence of the coordinating properties of the solvent on the 1 O 2 yield. However, this factor is not “critical” as in the case of photogeneration of 1 O 2 by copper tetra(5- tert -butylpyrazino)porphyrazine.