Effect of protonation on the photophysical properties of meso-tetra(sulfonatophenyl) porphyrin

被引：79

作者：

Gonçalves, PJ

De Boni, L

Neto, NMB

Rodrigues, JJ

Zílio, SC

Borissevitch, IE

机构：

[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Fis & Matemat, BR-14040901 Ribeirao Preto, SP, Brazil

[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 407卷 / 1-3期

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1016/j.cplett.2005.03.100

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present an experimental investigation on the photophysical properties of meso-tetra(sulfonatophenyl) porphyrin (TPPS4) in its bi-protonated and deprotonated states in water solutions at pH 4.0 and 7.0, respectively. The Z-scan technique at 532 nm with single 70 ps pulses as well as with pulse trains, was used in association with other complementary techniques such as UV-Vis absorption spectroscopy and time resolved fluorescence. The saturation behavior and the time evolution of nonlinear optical absorption were analyzed with a five-energy-level diagram. Photophysical parameters such as ground and excited states absorption cross-sections, together with the fluorescence lifetime and intersystem crossing time were determined. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：236 / 241

页数：6

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