Journal article
Aggregation of zinc tetraphenylporphyrin characterized by ensemble and single-molecule fluorescence spectroscopy
JA O'Brien, Y Lu, EN Hooley, KP Ghiggino, RP Steer, MF Paige
Canadian Journal of Chemistry | CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS | Published : 2011
DOI: 10.1139/V10-103
Abstract
The aggregation of metalloporphyrins is believed to play a crucial role in the excited-state annihilation process known as triplet-triplet annihilation, which in turn has significant potential applications in photon upconversion schemes. In this work, the propensity of the water-soluble metalloporphyrin zinc (II) meso-tetra(4-sulfonatophenyl)porphine to undergo aggregation when adsorbed to glass cover slips was investigated by single-molecule fluorescence microscopy. In proof-of-principle experiments, it was demonstrated (1) that individual molecules of the metalloporphyrin can be directly visualized in spite of their very weak fluorescence emission, and (2) that at low concentrations (10-8 ..
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Funding Acknowledgements
The authors are pleased to acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Foundation for Innovation (CFI), the Province of Saskatchewan, the Australian Research Council, and the University of Saskatchewan for providing financial support for this research. Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund for support of this research. We also thank Professors Trevor Smith (University of Melbourne) and Toby Bell (Monash University) for their assistance and for insightful comments during this project.