Table of Contents
Metal-Based Drugs
Volume 2008, Article ID 498916, 9 pages
http://dx.doi.org/10.1155/2008/498916
Research Article

Synthesis and Photophysical Properties of Tetra- and Octasubstituted Phosphorous Oxide Triazatetrabenzcorrole Photosensitizers

Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa

Received 27 August 2007; Accepted 10 December 2007

Academic Editor: Michael J. Cook

Copyright © 2008 Edith M. Antunes and Tebello Nyokong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The synthesis of phosphorous oxide triazatetrabenzcorroles (TBC) tetra- (9, 11) or octa- (13) substituted on the ring with halogenated functional groups is reported. The complexes are not aggregated in dimethylsulfoxide (DMSO) and show solubility in solvents such as pyridine. The Q band absorption spectra of the complexes are red-shifted compared to unsubstituted PTBC. The latter complex shows a large triplet lifetime (1.7 milliseconds), higher than for MPc derivatives. The chlorinated derivatives show good triplet yields (ΦT 0.46 and 0.36) and relatively long lifetimes (256 and 452 microseconds), respectively, for 11 and 13.