Aggregation behaviour of a tetracarboxylic porphyrin in aqueous solution

被引：28

作者：

Giovannetti, Rita ^{[1
]}

Alibabaei, Leila ^{[1
]}

Petetta, Laura ^{[1
]}

机构：

[1] Univ Camerino MC, Dept Environm Sci, Sect Chem, I-62032 Camerino, Italy

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2010年 / 211卷 / 2-3期

关键词：

Coproporphyrin; Dimerization; Aggregation; Spectrophotometry; SEM; DENDRITIC MULTIPORPHYRIN ARRAYS; SUBSTITUTED PORPHYRINS; PHOTODYNAMIC THERAPY; PHOTOCHEMOTHERAPEUTIC AGENTS; SELECTIVE BIODISTRIBUTION; OPTICAL NONLINEARITY; CHARGE SEPARATION; COPROPORPHYRIN-I; ENERGY-TRANSFER; EXCITON MODEL;

D O I：

10.1016/j.jphotochem.2010.02.003

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：

The aggregation of 3,8,13,18-tetramethyl-21 H,23H-porphine-2,7,2,17-tetrapropionic acid (Coproporphyrin-1) has been investigated by UV-vis spectroscopy in aqueous solutions. The aggregation occurred by total neutralization of propionic groups and can be induced by alkaline salts, hydrogen peroxide or acidification. The hydrogen peroxide effect is investigated in the presence of different concentrations and it has been observed that only high concentrations favour the formation of H-aggregates. The dimerization constants in the several experimental conditions are reported. The H-dimers of Coproporphyrin-1 in particular experimental conditions formed highly aggregate species depending on the pH. The kinetic of aggregation has been studied at different pHs and the results have showed that the log of kinetic constants k(p) were linearly dependent on the pH. The morphology of these aggregates, investigated by SEM spectroscopy, showed that the solvent polarity influenced their structures. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：108 / 114

页数：7

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