胶体TiO(2)对中位-四（4-磺酸基苯基）卟啉的荧光猝灭作用
Fluorescence quenching of meso-tetrakis (4-sulfonatophenyl) porphyrin by colloidal TiO(2).
作者信息
Kathiravan A, Anbazhagan V, Asha Jhonsi M, Renganathan R
机构信息
School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Aug;70(3):615-8. doi: 10.1016/j.saa.2007.08.007. Epub 2007 Aug 17.
A stable colloidal TiO(2) has been prepared. The interaction of meso-tetrakis (4-sulfonatophenyl) porphyrin (TSPP) with colloidal TiO(2) was studied by absorption and fluorescence spectroscopy. Upon excitation of its absorption band, the fluorescence emission of TSPP was quenched by colloidal TiO(2). The bimolecular quenching rate constant (k(q)) is 1.78 x 10(11)M(-1)s(-1). The porphyrin can participate in the quenching process by injecting electrons from its excited states into the conduction band of TiO(2). The quenching mechanism is discussed on the basis of the quenching rate constant as well as the reduction potential of the colloidal TiO(2). Rehm-Weller equation was applied for the calculation of free energy change (DeltaG(et)).
已制备出一种稳定的胶体二氧化钛。通过吸收光谱和荧光光谱研究了中-四（4-磺基苯基）卟啉（TSPP）与胶体二氧化钛的相互作用。在激发其吸收带时，TSPP的荧光发射被胶体二氧化钛猝灭。双分子猝灭速率常数（k(q)）为1.78×10(11)M(-1)s(-1)。卟啉可通过将其激发态的电子注入二氧化钛的导带参与猝灭过程。基于猝灭速率常数以及胶体二氧化钛的还原电位对猝灭机理进行了讨论。应用雷姆-韦勒方程计算自由能变化（ΔG(et)）。
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