Aggregation and photophysical properties of water-soluble sapphyrins

被引：10

作者：

Kubát, P

Lang, K

Zelinger, Z

Král, V

机构：

[1] Acad Sci Czech Republ, J Heyrovsky Inst Phys Chem, CR-18223 Prague 8, Czech Republic

[2] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic

[3] Inst Chem Technol, CR-16628 Prague 6, Czech Republic

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 395卷 / 1-3期

关键词：

D O I：

10.1016/j.cplett.2004.07.040

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：

Aggregation and photophysical properties of three sapphyrins were studied by UV/Vis, emission, resonance light scattering and laser kinetic spectroscopies. The relative abundance of various types of aggregates depends mainly on the structure of sapphyrin, solvent and temperature. The formation of H-dimers is related to negative entropy and enthalpy changes and it is controlled mainly by electrostatic interactions between the positively charged sapphyrin unit and negative substituents. Excitation of the H-dimers leads to the formation of the triplet states of the sapphyrin monomers. The quantum yields of the singlet oxygen in methanol vary between 0.30-0.33 and are independent of substitution. (C) 2004 Elsevier B.V. All rights reserved.

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页码：82 / 86

页数：5

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