REACTION CNTR CIDNP

Origin of the asymmetric electron transfer in photosynthesis explored by photo-CIDNP MAS NMR

 Coordinatore UNIVERSITEIT LEIDEN 

 Organization address address: RAPENBURG 70
city: LEIDEN
postcode: 2300 RA

contact info
Nome: Tonnis
Cognome: Brouwer
Email: send email
Telefono: 31715273149
Fax: 31715275269

 Nazionalità Coordinatore Netherlands [NL]
 Totale costo 161˙248 €
 EC contributo 161˙248 €
 Programma FP7-PEOPLE
Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
 Code Call FP7-PEOPLE-2009-IEF
 Funding Scheme MC-IEF
 Anno di inizio 2010
 Periodo (anno-mese-giorno) 2010-03-01   -   2011-10-31

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    UNIVERSITEIT LEIDEN

 Organization address address: RAPENBURG 70
city: LEIDEN
postcode: 2300 RA

contact info
Nome: Tonnis
Cognome: Brouwer
Email: send email
Telefono: 31715273149
Fax: 31715275269

NL (LEIDEN) coordinator 161˙248.80

Mappa


 Word cloud

Esplora la "nuvola delle parole (Word Cloud) per avere un'idea di massima del progetto.

molecular    orbital    transfer    reconstruction    donor    purple    homo    bacteria    single    photosystem    lumo    triplet    light    structure    electron    directionality    rcs    induced   

 Obiettivo del progetto (Objective)

'Photosynthetic reaction centres (RCs), such as the RC from purple bacteria or photosystems I and II of plants, have their cofactors arranged in a nearly C2 symmetry. Despite this symmetrical arrangement, the electron pathway in RCs of purple bacteria and photosystem II is entirely unidirectional occurring along a single branch. In photosystem I, however, both electron transfer branches are equally active. It appears that the understanding of the very basic principles of the directionality of light-induced electron transfer is lacking. Here we propose to solve this question by combining laser-flash photochemically induced dynamic nuclear polarization (photo-CIDNP) magic angle spinning (MAS) NMR, providing electronic structure information of the highest occupied molecular orbital (HOMO) and the donor triplet at atomic resolution. This experimental data in combination with theoretical calculations will allow reconstructing the lowest unoccupied molecular orbital (LUMO) from which the electron is transferred. Our approach is based on the assumptions that (i) the donor triplet can be approximated by single electron occupation of both HOMO and LUMO, (ii) the structure of the LUMO is responsible for the directionality of the light-induced electron transfer. Hence, we aim at reconstruction of the LUMO of the electron donor as key for understanding directionality. This reconstruction may also stimulate research on artificial photosynthesis, which is currently facing the problem to direct charge separation into macroscopically useful units.'

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