The DQF-COSY NMR Experiment, a Way to Detect Small J Couplings in the Case of Fast Relaxing Nuclei: Application to 59Co in the Tetrahedral Mixed-Metal Cluster HRuCo3(CO)11(PPh3) - Open Access Library Journal

OALibJ > Vol.1 No.3, June 2014

Volume 1, Issue 3 (June 2014)

ISSN Print: 2333-9705 ISSN Online: 2333-9721

Google-based Impact Factor: 0.73 Citations

The DQF-COSY NMR Experiment, a Way to Detect Small J Couplings in the Case of Fast Relaxing Nuclei: Application to ⁵⁹Co in the Tetrahedral Mixed-Metal Cluster HRuCo₃(CO)₁₁(PPh₃) ()

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DOI: 10.4236/oalib.1100622 1,569 Downloads 2,895 Views Citations

Author(s)

Jacky Rosé¹, Pierre Kempgens^2*

Affiliation(s)

¹Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg, Strasbourg, France.
²Department of Chemistry, Rhodes University, Grahamstown, South Africa.

ABSTRACT

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 |¹J(⁵⁹Co-⁵⁹Co)| ＜ 300 Hz for this cluster.

KEYWORDS

NMR, Cobalt-59, 2D COSY and DQF-COSY, Scalar Couplings, Tetrahedral Mixed-Metal Cluster

Share and Cite:

Rosé, J. and Kempgens, P. (2014) The DQF-COSY NMR Experiment, a Way to Detect Small J Couplings in the Case of Fast Relaxing Nuclei: Application to ⁵⁹Co in the Tetrahedral Mixed-Metal Cluster HRuCo₃(CO)₁₁(PPh₃). Open Access Library Journal, 1, 1-9. doi: 10.4236/oalib.1100622.

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