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An investigation of the behavior of quaternized peripherally tetra mercaptopyridine substituted metallophthalocyanines in the presence of quantum dots

Paper ID Volume ID Publish Year Pages File Format Full-Text
28885 44102 2010 9 PDF Available
Title
An investigation of the behavior of quaternized peripherally tetra mercaptopyridine substituted metallophthalocyanines in the presence of quantum dots
Abstract

The preparation of quaternized peripherally tetra 2-mercaptopyridine substituted phthalocyanines (Pcs) containing Ga3+ (3) and In3+ (4) as central metal ions is reported for the first time in this study. In order to determine the potential of these water soluble complexes as photosensitizers for use in photodynamic therapy, photophysical and photochemical studies were carried out on these compounds. In a water:ethanol solvent mixture fluorescence quantum yields (ΦF) were 0.27 (3) and 0.18 (4); triplet quantum yields (ΦT) were 0.75 (3) and 0.84 (4), respectively. The triplet lifetimes ranged from 20 to 650 μs, and were larger in DMSO when compared with those in the water:ethanol solvent mixture. The behavior of both complexes in the presence of quantum dots (QDs) was studied and gave evidence of reduction of the complexes by the mercaptopropionic acid stabilizing agent on the surface of the QDs.

Keywords
Quaternization; Metallophthalocyanine; 2-Mercaptopyridine; Singlet oxygen; Fluorescence; Quantum yield; Quantum dots
First Page Preview
An investigation of the behavior of quaternized peripherally tetra mercaptopyridine substituted metallophthalocyanines in the presence of quantum dots
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 215, Issues 2–3, 25 September 2010, Pages 196–204
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering