%0 Journal Article
%T The DQF-COSY NMR Experiment, a Way to Detect Small J Couplings in the Case of Fast Relaxing Nuclei: Application to <sup>59</sup>Co in the Tetrahedral Mixed-Metal Cluster HRuCo<sub>3</sub>(CO)<sub>11</sub>(PPh<sub>3</sub>)
%A Jacky Ros¨¦
%A Pierre Kempgens
%J Open Access Library Journal
%V 1
%N 3
%P 1-9
%@ 2333-9721
%D 2014
%I Open Access Library
%R 10.4236/oalib.1100622
%X The first investigation and analysis of 59Co 2D NMR homonuclear chemical shift correlation spectra for a ruthenium-based tetrahedral mixed-metal cluster HRuCo3(CO)11(PPh3) are reported. For this cluster in solution and by contrast to the conventional COSY NMR experiment, the double-quantum filtered (DQF) COSY NMR spectrum proves the existence of a scalar coupling constant between 59Co nuclei. In order to obtain a value of this coupling, the 2D COSY spectrum for a three-spin 7/2 AX2 system has been simulated by numerical density matrix calculations. The comparison between experimental and theoretical 2D NMR COSY spectra gives a spin-coupling constant <sup>1</sup>J(<sup>59</sup>Co-<sup>59</sup>Co))|<300 Hz for this cluster.
%K NMR
%K Cobalt-59
%K 2D COSY and DQF-COSY
%K Scalar Couplings
%K Tetrahedral Mixed-Metal Cluster
%U http://www.oalib.com/paper/3086489