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By 1Н dynamic NMR method the conformational reorientation of the 18-crown-6 ether molecules in [(Ce(ptfa)3)2(18crown-6)] complexes has been experimentally studied in the CDCl3 solution. The results of the present work demonstrate that there is a conformational dynamic processes in [(Ce(ptfa)3)2(18-crown-6)] complex (with the activation free energy ∆G‡(320K) = 49 ± 4 kJ/mol ). It is conditioned by conformational reorientation of 18-crown-6 molecule. These complexes are promising to be subnanoscale NMR spectroscopic probes to determine the temperature in nonaqueous media.

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Lanthanide Paramagnetic Probes for NMR Spectroscopic Studies of Fast Molecular Conformational Dynamics and Temperature Control. 18-Crown-6 Intramolecular Reorientation in Complexes of Cerium(III) Chelates