Photophysical, photochemical properties of chalcone substituted Zinc(II) and Magnesium(II) metallophthalocyanines bearing thiophene units

The novel thiophene-chalcone compound (2), phthalonitrile derivatives bearing thiophene-chalcone group (3 and 4) and their zinc (II) (ZnPcs) (3a and 4a) and magnesium (II) (MgPcs) (3b and 4b) phthalocyanine compounds were synthesized in this study. The structure of all these new compounds were elucidated by spectroscopic techniques like IR, (1) H NMR, (13) C NMR (for compounds 2, 3 and 4), MALDI-TOF mass and UV-Vis. The fluorescence quantum yields and lifetimes (photophysical properties), and the singlet oxygen and photodegradation quantum yields (photochemical properties) of thiophene bearing chalcone substituted ZnPcs (3a and 4a) and MgPcs (3b and 4b) were studied in DMSO (dimethylsulfoxide) to determine if they are convenient photosensitizers for photodynamic therapy (PDT) applications.