Cargando…

The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins

Understanding how specific protein environments affect the mechanisms of non-radiative energy dissipation within densely assembled chlorophylls in photosynthetic protein complexes is of great interest to the construction of bioinspired solar energy conversion devices. Mixing of charge-transfer and e...

Descripción completa

Detalles Bibliográficos
Autores principales: Wahadoszamen, Md., Margalit, Iris, Ara, Anjue Mane, van Grondelle, Rienk, Noy, Dror
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4255223/
https://www.ncbi.nlm.nih.gov/pubmed/25342121
http://dx.doi.org/10.1038/ncomms6287
_version_ 1782347405115523072
author Wahadoszamen, Md.
Margalit, Iris
Ara, Anjue Mane
van Grondelle, Rienk
Noy, Dror
author_facet Wahadoszamen, Md.
Margalit, Iris
Ara, Anjue Mane
van Grondelle, Rienk
Noy, Dror
author_sort Wahadoszamen, Md.
collection PubMed
description Understanding how specific protein environments affect the mechanisms of non-radiative energy dissipation within densely assembled chlorophylls in photosynthetic protein complexes is of great interest to the construction of bioinspired solar energy conversion devices. Mixing of charge-transfer and excitonic states in excitonically interacting chlorophylls was implicated in shortening excited states lifetimes but its relevance to active control of energy dissipation in natural systems is under considerable debate. Here we show that the degree of fluorescence quenching in two similar pairs of excitonically interacting bacteriochlorophyll derivatives is directly associated with increasing charge transfer character in the excited state, and that the protein environment may control non-radiative dissipation by affecting the mixing of charge transfer and excitonic states. The capability of local protein environments to determine the fate of excited states, and thereby to confer different functionalities to excitonically coupled dimers substantiates the dimer as the basic functional element of photosynthetic enzymes.
format Online
Article
Text
id pubmed-4255223
institution National Center for Biotechnology Information
language English
publishDate 2014
record_format MEDLINE/PubMed
spelling pubmed-42552232015-04-24 The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins Wahadoszamen, Md. Margalit, Iris Ara, Anjue Mane van Grondelle, Rienk Noy, Dror Nat Commun Article Understanding how specific protein environments affect the mechanisms of non-radiative energy dissipation within densely assembled chlorophylls in photosynthetic protein complexes is of great interest to the construction of bioinspired solar energy conversion devices. Mixing of charge-transfer and excitonic states in excitonically interacting chlorophylls was implicated in shortening excited states lifetimes but its relevance to active control of energy dissipation in natural systems is under considerable debate. Here we show that the degree of fluorescence quenching in two similar pairs of excitonically interacting bacteriochlorophyll derivatives is directly associated with increasing charge transfer character in the excited state, and that the protein environment may control non-radiative dissipation by affecting the mixing of charge transfer and excitonic states. The capability of local protein environments to determine the fate of excited states, and thereby to confer different functionalities to excitonically coupled dimers substantiates the dimer as the basic functional element of photosynthetic enzymes. 2014-10-24 /pmc/articles/PMC4255223/ /pubmed/25342121 http://dx.doi.org/10.1038/ncomms6287 Text en Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms
spellingShingle Article
Wahadoszamen, Md.
Margalit, Iris
Ara, Anjue Mane
van Grondelle, Rienk
Noy, Dror
The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title_full The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title_fullStr The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title_full_unstemmed The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title_short The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
title_sort role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll-proteins
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4255223/
https://www.ncbi.nlm.nih.gov/pubmed/25342121
http://dx.doi.org/10.1038/ncomms6287
work_keys_str_mv AT wahadoszamenmd theroleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT margalitiris theroleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT araanjuemane theroleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT vangrondellerienk theroleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT noydror theroleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT wahadoszamenmd roleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT margalitiris roleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT araanjuemane roleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT vangrondellerienk roleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins
AT noydror roleofchargetransferstatesinenergytransferanddissipationwithinnaturalandartificialbacteriochlorophyllproteins