Abstract: 1H and 13C NMR measurements are reported for the CDCl3 and CD2Cl2 solutions of [La(NO3)3(18-crown-6)] (I), [Pr(NO3)3(18-crown-6)] (II) and [Ce(NO3)3(18-crown-6)] (III) complexes. Temperature dependencies of the 1H NMR spectra of II have been analyzed using the dynamic NMR methods for multi-site exchange. Two types of conformational dynamic processes in II were identified (the first one with activation enthalpy ΔH ‡=264kJ/mol is conditioned by interconversion of complex enantiomeric form and pseudorotation of macrocycle molecule upon the C 2 symmetry axis, the second one with ΔH ‡=465kJ/mol is conditioned by macrocycle molecule inversion). Studies of the values of the lanthanide-induced shifts revealed that the structure of complexes in solution is similar to that reported for the complex I in the crystal state.

Cite: Babailov S.P. , Nikulina L.D.
NMR Studies of Mixed-Ligand Lanthanide Complexes in Solution: Pseudorotation and Ring Inversion of 18-Crown-6 Molecule in Cerium Subgroup Chelates
Journal of Inclusion Phenomena and Macrocyclic Chemistry. 2005. V.51. N1-2. P.103-109. DOI: 10.1007/s10847-004-4673-5 WOS Scopus РИНЦ OpenAlex

Dates:

Published print:

Jan 1, 2005

Identifiers:

Web of science:	WOS:000230591800015
Scopus:	2-s2.0-18844442908
Elibrary:	13476436
OpenAlex:	W2004982679

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Scopus	14
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