CNMRPS

Computation of Nuclear Magnetic Relaxation in Paramagnetic Systems

 Coordinatore OULUN YLIOPISTO 

 Organization address address: Pentti Kaiteran Katu 1
city: OULU
postcode: 90014

contact info
Titolo: Dr.
Nome: Leila
Cognome: Risteli
Email: send email
Telefono: -5533621
Fax: -5533623

 Nazionalità Coordinatore Finland [FI]
 Totale costo 169˙888 €
 EC contributo 169˙888 €
 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) 2010-04-01   -   2012-03-31

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    OULUN YLIOPISTO

 Organization address address: Pentti Kaiteran Katu 1
city: OULU
postcode: 90014

contact info
Titolo: Dr.
Nome: Leila
Cognome: Risteli
Email: send email
Telefono: -5533621
Fax: -5533623

FI (OULU) coordinator 169˙888.00

Mappa


 Word cloud

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

spectral    electronic    magnetic    functions    nuclear    mri    paramagnetic    gd    resonance    spin    dynamics    sc    pnmr    redfield    correlation    chemistry    then    pre    relaxation    chemical    theory    electron    spins    curie    quantum    interaction    nmr    models    time    instantaneous    molecular    structural   

 Obiettivo del progetto (Objective)

'The spectral parameters of nuclear magnetic resonance (NMR) provide information on molecular structure and properties. Furthermore, NMR relaxation conveys information on molecular dynamics, rotation, chemical exchange and collisions. Paramagnetic NMR (pNMR) is gaining importance in chemistry, structural biology, magnetic resonance imaging (MRI) and materials science. Open-shell molecules experience the sc. paramagnetic relaxation enhancement (PRE) due to time-dependent interaction of the nuclear spin with the unpaired electron(s). Besides dynamics, the different contributions to PRE also encode structural information. Phenomenological theories describing PRE involve time correlation and spectral density functions of either the time-averaged or instantaneous hyperfine interaction, in the sc. Curie and electronic relaxation, respectively. These models rely on approximations such as single-exponential decay of the correlation functions, and simplified models of molecular dynamics. We will apply the full arsenal of state-of-the-art computational chemistry on PRE, by first performing ab initio molecular dynamics simulations, and then applying quantum-chemical calculations of the magnetic properties for instantaneous simulation snapshots. We apply the Redfield relaxation theory for the Curie mechanism, using the novel and general methodology for the pNMR shielding tensor developed by the host group, as well as the electron spin relaxation rate. The electronic relaxation of nuclear spins is then approached both by the semiclassical Redfield theory applied to the instantaneous dipolar interaction between the electronic and nuclear spins, as well as by fully quantum-mechanical, coupled time-evolution of the two systems. Methods are developed with the aqueous solution of the Ni(II) ion used as prototype system. Applications to Gd(aq) as well as endohedral Gd fullerenes are investigated, with impact on the development of novel, efficient and safe MRI contrast agents.'

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