Sonophotochemical and photochemical efficiency of thiazole-containing metal phthalocyanines and their gold nanoconjugates

Abstract

This study presents the synthesis of some metal {M = Zn(II), Lu(III), Si(IV)} phthalocyanines bearing chlorine and 2-(4-methylthiazol-5-yl) ethoxy groups at peripheral or axial positions. The newly synthesized metal phthalocyanines were characterized by applying FT-IR, 1 H NMR, mass, and UV-Vis spectroscopic approaches. Additionally, the surface of gold nanoparticles was modified with zinc(II) and silicon(IV) phthalocyanines. The resultant nanoconjugates were characterized using TEM images. Moreover, the effect of metal ions and position of substituent, and gold nanoparticles on the photochemical and sonophotochemical properties of the studied phthalocyanines was investigated. The highest singlet oxygen quantum yield was obtained for the lutetium phthalocyanine by applying photochemical and sonophotochemical methods. However, the linkage of the zinc(II) and silicon(IV) phthalocyanines to the surface of gold nanoparticles improved significantly their singlet oxygen generation capacities.

Novel non-peripheral mercaptopyridine-substituted mono- and double-decker lutetium(iii) phthalocyanines: synthesis, photophysicochemical and electrochemical properties

“…The large atomic number of lutetium coordinating atoms in the cavity of these phthalocyanines could support the intersystem crossing to their excited triplet state upon excitation, which may be responsible for the low fluorescence quantum yields ( Φ F ). 38 The synthesized LuPc and mono-lutetium( iii ) phthalocyanine bearing 2-(4-methylthiazol-5-yl) ethoxy groups ( Φ F = 0.007) 43 showed similar fluorescence quantum yields. Also, the synthesized LuPc 2 and asymmetric double-decker lutetium( iii ) phthalocyanine ( Φ F = 0.002) exhibited the same values.…”