Jump to main content
Jump to site search

Issue 6, 2007
Previous Article Next Article

Determination of the triplet state energies of a series of conjugated porphyrin oligomers

Author affiliations

Abstract

We report a systematic study of the photophysical parameters relevant to photodynamic therapy (PDT) by a new type of sensitizers, conjugated porphyrin oligomers. Due to the strong nonlinear properties of oligomers containing 2, 4 and 8 porphyrin units, these molecules are attractive candidates for PDT via multiphoton excitation. The triplet state energy levels for all molecules have been determined by the triplet quenching method, phosphorescence measurements and DFT calculations. We find that the triplet energies of all the oligomers are sufficient to generate singlet oxygen, >94 kJ mol−1. However, low singlet oxygen quantum yields are observed for the tetramer and the octamer, as compared to the conjugated dimer and monomeric porphyrin, reflecting the decrease in triplet yield. Thus the conjugated porphyrin dimer is the most promising core structure for PDT applications via multiphoton excitation.

Graphical abstract: Determination of the triplet state energies of a series of conjugated porphyrin oligomers

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 23 Jan 2007, accepted on 26 Feb 2007 and first published on 03 Apr 2007


Article type: Paper
DOI: 10.1039/B700557A
Citation: Photochem. Photobiol. Sci., 2007,6, 675-682
  •   Request permissions

    Determination of the triplet state energies of a series of conjugated porphyrin oligomers

    M. K. Kuimova, M. Hoffmann, M. U. Winters, M. Eng, M. Balaz, I. P. Clark, H. A. Collins, S. M. Tavender, C. J. Wilson, B. Albinsson, H. L. Anderson, A. W. Parker and D. Phillips, Photochem. Photobiol. Sci., 2007, 6, 675
    DOI: 10.1039/B700557A

Search articles by author