Gaggelli Elena, Gaggelli Nicola, Valensin Daniela, Valensin Gianni, Jezowska-Bojczuk Małgorzata, Kozłowski Henryk
Department of Chemistry, University of Siena, Via Aldo Moro, 53100 Siena, Italy.
Inorg Chem. 2002 Mar 25;41(6):1518-22. doi: 10.1021/ic010388e.
The copper(II) complex of lincomycin in water solution at pH = 7.15 was characterized by (1)H and (13)C NMR and UV-vis spectroscopy. A 1:1 complex is formed in these conditions. The temperature dependence of spin-lattice relaxation rates was measured, showing that all protons behave in a similar fashion and slow exchange conditions prevail. The spin-lattice relaxation rate enhancements were interpreted by the Solomon-Bloembergen-Morgan theory. Reorientational dynamics of the complex was approximated by evaluating the motional correlation time of free lincomycin in water solution. The observed proton and carbon relaxation rate enhancements allowed us to calculate copper-proton and copper-carbon distances that were used for building a molecular model of the complex. The obtained data provide an interpretation of the relatively high stability constant.
