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Singlet and Triplet Energy Transfer Dynamics in Self-Assembled Axial Porphyrin-Anthracene Complexes: Towards Supra-molecular Structures for Photon Upconversion

Abstract

Energy and electron transfer reactions are central to many different processes and research fields, from photosynthesis and solar energy harvesting to biological and medical applications. Herein we report a comprehensive study of the singlet and triplet energy transfer dynamics in porphyrinanthracene coordination complexes. Seven newly synthesized pyridine functionalized anthracene ligands, five with varying bridge lengths and two dendrimer structures containing three and seven anthracene units, have been prepared. We find that triplet energy transfer from ruthenium octaethylporphyrin to an axially coordinated anthracene is possible, and is in some cases followed by back triplet energy transfer to the porphyrin. The triplet energy transfer follows an exponential distance dependence with an attenuation factor, β, of 0.64 Å-1. Further, singlet energy transfer from the anthracene to the ruthenium porphyrin appears to follow a r6 Förster distance dependence. The porphyrin-anthracene complexes are also used as triplet senzitizers for triplet-triplet annihilation (TTA) based photon upconversion, demonstrating their potential for photophysical and photochemical applications. The triplet lifetime of the complex is extended by the anthracene ligands, resulting in a twofold increase in the upconversion efficiency, ΦUC to 4.5% compared to the corresponding ruthenium porphyrin-pyridine complex. Based on the results herein we discuss the future design of supra-molecular structures for TTA upconversion.

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Publication details

The article was accepted on 12 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C8CP00884A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Singlet and Triplet Energy Transfer Dynamics in Self-Assembled Axial Porphyrin-Anthracene Complexes: Towards Supra-molecular Structures for Photon Upconversion

    V. Gray, B. Küçüköz, F. Edhborg, M. Abrahamsson, K. Moth-Poulsen and B. Albinsson, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00884A

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