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Issue 7, 2016
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Excitation wavelength-dependent EPR study on the influence of the conformation of multiporphyrin arrays on triplet state delocalization

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Abstract

The optoelectronic properties of conjugated porphyrin arrays render them excellent candidates for use in a variety of molecular electronic devices. Understanding the factors controlling the electron delocalization in these systems is important for further developments in this field. Here, we use transient EPR and ENDOR (Electron Nuclear Double Resonance) to study the extent of electronic delocalization in the photoexcited triplet states of a series of butadiyne-linked porphyrin oligomers. We are able to distinguish between planar and twisted arrangements of adjacent porphyrin units, as the different conformations are preferentially excited at different wavelengths in the visible range. We show that the extent of triplet state delocalization is modulated by the torsional angle between the porphyrins and therefore by the excitation wavelength. These results have implications for the design of supramolecular systems with fine-tuned excitonic interactions and for the control of charge transport.

Graphical abstract: Excitation wavelength-dependent EPR study on the influence of the conformation of multiporphyrin arrays on triplet state delocalization

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Supplementary files

Article information


Submitted
02 Dec 2015
Accepted
08 Jan 2016
First published
08 Jan 2016

Phys. Chem. Chem. Phys., 2016,18, 5275-5280
Article type
Paper
Author version available

Excitation wavelength-dependent EPR study on the influence of the conformation of multiporphyrin arrays on triplet state delocalization

C. E. Tait, P. Neuhaus, M. D. Peeks, H. L. Anderson and C. R. Timmel, Phys. Chem. Chem. Phys., 2016, 18, 5275
DOI: 10.1039/C5CP07424J

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