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

Marina K. Kuimova, Markus Hoffmann, Mikael U. Winters, Mattias Eng, Milan Balaz, Ian P. Clark, Hazel A. Collins, Susan M. Tavender, Craig J. Wilson, Bo Albinsson, Harry L. Anderson, Anthony W. Parker, David Phillips

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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.

Original languageEnglish
Pages (from-to)675-682
Number of pages8
JournalPhotochemical and Photobiological Sciences
Volume6
Issue number6
DOIs
Publication statusPublished - 2007 Jan 1

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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    Kuimova, M. K., Hoffmann, M., Winters, M. U., Eng, M., Balaz, M., Clark, I. P., Collins, H. A., Tavender, S. M., Wilson, C. J., Albinsson, B., Anderson, H. L., Parker, A. W., & Phillips, D. (2007). Determination of the triplet state energies of a series of conjugated porphyrin oligomers. Photochemical and Photobiological Sciences, 6(6), 675-682. https://doi.org/10.1039/b700557a