Frequency-switching inversion-recovery for severely hyperfine-shifted NMR: evidence of asymmetric electron relaxation in high-spin Co(II).
A new method for reliably measuring longitudinal relaxation rates for severely hyperfine-shifted NMR signals in aqueous solutions is presented. The method is illustrated for a well-defined cobalt tetracysteinate, with relevance to cobalt-substituted metalloproteins. The relaxation measurements are indicative of asymmetric electronic relaxation of the high-spin Co(II) ion.
Riley
Erin A
EA
Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, USA.
Petros
Amy K
AK
Smith
Karen Ann
KA
Gibney
Brian R
BR
Tierney
David L
DL