Spectral studies of zinc octacarboxyphthalocyanine aggregation

被引：40

作者：

Suchan, Artur ^{[1
]}

Nackiewicz, Joanna ^{[1
]}

Hnatejko, Zbigniew ^{[2
]}

Waclawek, Witold ^{[1
]}

Lis, Stefan ^{[2
]}

机构：

[1] Univ Opole, Inst Chem, PL-45957 Opole, Poland

[2] Adam Mickiewicz Univ Poznan, Fac Chem, PL-60780 Poznan, Poland

来源：

DYES AND PIGMENTS | 2009年 / 80卷 / 02期

关键词：

Zinc octacarboxyphthalocyanine; Aggregation; UV-vis spectra; Fluorescence; SULFUR-CONTAINING-COMPOUNDS; PHTHALOCYANINE DERIVATIVES; TETRASULFONATED PHTHALOCYANINE; AQUEOUS-SOLUTIONS; ORGANIC-SOLVENTS; METALLOPHTHALOCYANINES; COMPLEXES; PHOTOOXIDATION; DIMERIZATION; ABSORPTION;

D O I：

10.1016/j.dyepig.2008.06.009

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The association of zinc octacarboxyphthalocyanine, was studied using UV-vis absorption and fluorescence emission spectroscopy; the effects of dye concentration, pH and solvents on spectra were discussed. Calculations showed that the dye dimerized in aqueous solutions ranging from 5.0 x 10(-7) to 5.0 x 10(-5) mol/dm(3), at 25 degrees C. The dimerization constant of 10(6) dm(3)/mol and the spectral Q band shift of 1185 cm(-1) imparted by dimerization indicated strong pi-pi interactions between phthalocyanine molecules. Red S-1 fluorescence of the dye monomer was observed in various solutions which was quenched owing to molecular association and other factors. The strong influence of pH on both aggregation and fluorescence was discussed. At pH < 5.0, only dye aggregates were present in solution; monomers appeared at pH >= 5.0 and, in alkaline solution, only the monomeric anions of phthalocyanine existed. The spectral absorption and emission data for the dye in binary solvents revealed that at concentrations ranging from 0.5 x 10(-5) to 1.0 x 10(-5) mol/dm(3), the dye can be used in photosensitised oxidation reactions. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：239 / 244

页数：6

共 42 条

[1] The characterisation of three substituted zinc phthalocyanines of differing charge for use in photodynamic therapy. A comparative study of their aggregation and photosensitising ability in relation to mTHPC and polyhaematoporphyrin [J].