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6 March 2009 Multifluorescence emission of several novel phthalocyanines as potential photodynamic diagnosis materials
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Two kinds of novel phthalocyanines: tetra-azobenzene substituted phthalocyanine (metal free and with zinc as centric atom) and novel polymeric phthalocyanine carboxyl based on pentaerythritol framework (with ytterbium and aluminum as centric atoms) have been synthesized and their electronic adsorption and emission spectrum haven been investigated in water solution and organic solvent. Both synthesized compounds can emit two fluorescence peaks when excited at low wavelength (below 400nm) and one emission peak when excited at long wavelength (higher than 600 nm). For polymeric aluminum phthalocyanine carboxyl, in pH7.4 buffer solution, when excited at 330nm, beside normal fluorescence peak at 720nm, a second emission peak appears at 455nm. The emission at 720 nm can be intensified by addition of hexadecyl trimethyl ammonium bromide (CTAB) while the peak at 455nm does not. The fluorescence quantum yield of two emission peaks is 0.35 (720nm em, 635nm ex) and 0.33 (455nm em, 330nm ex), respectively. This equivalent multi-emission phenomenon by different excited wavelength indicates well applied potential in dual-wavelength photodynamic diagnose and fluorescence imagination.
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Yong-Sung Park, Je-Wan Woo, Peng Zhao, Zihui Chen, and Fushi Zhang "Multifluorescence emission of several novel phthalocyanines as potential photodynamic diagnosis materials", Proc. SPIE 7280, Seventh International Conference on Photonics and Imaging in Biology and Medicine, 72802M (6 March 2009);

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