Determination of metal-proton distances and electronic relaxation times in lanthanide complexes by nuclear magnetic resonance spectroscopy

Silvio Aime, Luca Barbero, Mauro Botta, Giuseppe Ermondi

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The longitudinal and transverse relaxation times of the proton resonances of three lanthanide(III) complexes of 1,4,7,10-tetraazacyclododecane-N,N′,N″,N′″-tetraacetate have been measured. This allows determination of the metal-proton distances and the electronic relaxation times of the paramagnetic metal ions by exploiting the Curie-spin mechanism contribution to the transverse relaxation rates, once the molecular reorientational time τr is known by an independent experiment. Values of the parameters calculated from data obtained at a single magnetic field (9.4 T) were in good agreement with those found from the evaluation of the magnetic field-induced line broadening of the proton resonances as measured at 2.1, 4.7 and 9.4 T. A chemical exchange contribution to the linewidths is excluded on the basis of experiments performed at different temperatures.

Lingua originaleInglese
pagine (da-a)225-228
Numero di pagine4
RivistaJournal of the Chemical Society. Dalton Transactions
Numero di pubblicazione2
DOI
Stato di pubblicazionePubblicato - 1992
Pubblicato esternamente

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