Abstract
The copper(II) complex of amitraz, a formamidine pesticide, was investigated by measuring 1H NMR spin-lattice relaxation rate enhancements (PRRE) in [ 2H 6]-DMSO solution. The occurrence of fast exchange conditions was demonstrated by the temperature dependence of the PRRE. The PRRE was interpreted by the Solomon-Bloembergen-Morgan approach; the number of solvent molecules in the coordination shell was calculated at q = 2; the reorientational correlation time in the 1 : 1 metal complex was assumed to be the same as in the free ligand and calculated at τ c = 69 ps. The metal ion was shown to stabilize a cisoid conformation of the ligand.
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