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A simple zinc-porphyrin-NDI dyad system generates a light energy to proton potential across a lipid membrane

Version 2 2024-06-13, 10:36
Version 1 2017-07-17, 14:30
journal contribution
posted on 2024-06-13, 10:36 authored by MMA Kelson, RS Bhosale, K Ohkubo, LA Jones, SV Bhosale, A Gupta, S Fukuzumi
We report a simple donor-acceptor dyad system capable of acting as an artificial mimic of the photosynthetic apparatus by transporting electrons across a lipid bilayer resulting in the conversion of light energy to a proton potential. The active dyad described here consists of a zinc-porphyrin as a donor and NDI as an acceptor, connected through a dithiophene spacer. Incorporation of the dyad into a lipid bilayer, followed by excitation of the zinc-porphyrin, resulted in charge separation to create a reduction potential near the inner surface and an oxidation potential near the outer surface. This led to transmembrane electron transfer where quinone was converted into hydroquinone inside the vesicle by accepting protons from the HPTS dye, creating a pH gradient. This phenomenon was supported by use of a control molecule without an appropriate spacer and electrochemical and photophysical measurements further support the existence of charge separated states and formation of stable radicals.

History

Journal

Dyes and pigments

Volume

120

Pagination

340-346

Location

Kidlington, Eng.

ISSN

0143-7208

eISSN

1873-3743

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier

Publisher

Elsevier