Investigation of photochemical and photophysical properties of novel silicon(IV) phthalocyanines and their $\mu $-oxo dimers

Authors : Ömer GÜNGÖR, Mahmut DURMUŞ, Vefa AHSEN

Pages : 803-812

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The synthesis and characterization of novel tetraalkylthio insert ignore into journalissuearticles values(SC$_{6}$H$_{13}$ or SC$_{12}$H$_{25});$ substituted $\mu $-oxo siliconinsert ignore into journalissuearticles values(IV); phthalocyanines insert ignore into journalissuearticles values(3a and 3b); and their $\mu$-oxo derivatives insert ignore into journalissuearticles values(4a and 4b); were described in this study. These siliconinsert ignore into journalissuearticles values(IV); phthalocyanines were characterized using different spectroscopic techniques such as UV-Vis, $^{1}$H NMR, FT-IR, and mass and elemental analysis, as well. Furthermore, the photophysical insert ignore into journalissuearticles values(fluorescence quantum yields and lifetimes); and photochemical insert ignore into journalissuearticles values(singlet oxygen generation); properties of the newly synthesized siliconinsert ignore into journalissuearticles values(IV); phthalocyanines insert ignore into journalissuearticles values(3a, 3b, 4a, and 4b); were investigated in dimethylformamide solution. The absorption and fluorescence excitation wavelengths of the studied siliconinsert ignore into journalissuearticles values(IV); phthalocyanines were blue-shifted when they converted to their $\mu $-oxo dimers. The fluorescence quantum yield and lifetime values decreased with the substitution of the tetraalkylthio groups on the phthalocyanine ring. The singlet oxygen generation of the studied siliconinsert ignore into journalissuearticles values(IV); phthalocyanines increased with the formation of the $\mu $-oxo bridge between two phthalocyanine rings.
Keywords : Phthalocyanine, silicon, photochemical, photophysical, singlet oxygen, fluorescence