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Issue 25, 2020
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Anisotropic energy transfer in a clay–porphyrin layered system with environment-responsiveness

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Abstract

The adsorption orientation behavior of tetrakis(1-methylpyridinium-3-yl)porphyrin (m-TMPyP) and tetrakis(1-methylpyridinium-4-yl)porphyrin (p-TMPyP) on the clay monolayer prepared by the Langmuir Blodgett (LB) technique was investigated using the absorption and dichroic spectra obtained on a waveguide. It was revealed that the orientation of m-TMPyP and p-TMPyP on the clay monolayer, that is parallel and tilted with respect to the clay surface, depends on the surrounding environments such as water and N,N-dimethylformamide (DMF). The anisotropic photochemical energy transfer between m-TMPyP as a donor and p-TMPyP as an acceptor in the layered system was investigated in water and in DMF–water (9/1 (v/v)) by a fluorescence observation. As a result, while energy transfer efficiency (ηET) was 60% for the parallel–parallel orientation in water, that was 10% for the tilted–tilted orientation in DMF–water (9/1 (v/v)). The major factor for the change of ηET could be a change of the distance between m-TMPyP and p-TMPyP, and the J value that is a parameter for spectral overlap between energy donor's fluorescence and acceptor's absorption.

Graphical abstract: Anisotropic energy transfer in a clay–porphyrin layered system with environment-responsiveness

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Supplementary files

Article information


Submitted
28 Apr 2020
Accepted
05 Jun 2020
First published
05 Jun 2020

Phys. Chem. Chem. Phys., 2020,22, 14261-14267
Article type
Paper

Anisotropic energy transfer in a clay–porphyrin layered system with environment-responsiveness

H. Nishina, S. Hoshino, Y. Ohtani, T. Ishida, T. Shimada and S. Takagi, Phys. Chem. Chem. Phys., 2020, 22, 14261
DOI: 10.1039/D0CP02263B

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