Abstract: (1)H nuclear magnetic resonance (NMR) measurements are reported for the D(2)O solutions of [Ln(3+)(EDTA(4-))](-) complexes, where EDTA(4-) is ethylenediaminetetraacetate anion, Ln(3+) = Tb(3+) (I), Ho(3+) (II), Tm(3+) (III), Yb(3+) (IV) and Lu(3+) (V). Temperature dependencies of the (1)H NMR spectra of paramagnetic I-IV have been analyzed using the dynamic NMR methods. It is found that the activation free energies (ΔG(‡)(298)) of the intermolecular EDTA ions exchange at [Ln(3+) (EDTA(4-))](-) complexes are 60±3 (I), 66±3 (II), 69±3 (III) and 74±3 (IV) kJ/mol (at pD = 7). A monotonic increase of the free energy of chemical exchange processes along the series of lanthanide [Ln(3+) (EDTA(4-))](-) complexes is probably related to the lanthanide contraction. The obtained results indicate that coordination compounds I-IV may be considered as thermometric NMR sensors and lanthanide paramagnetic probes for in situ temperature control in solution.

Cite: Babailov S.P.
Intermolecular dynamics and paramagnetic properties of ethylenediaminetetraacetate complexes with the yttrium subgroup rare earth elements using nuclear magnetic resonance
Magnetic Resonance in Chemistry. 2012. V.50. N12. P.793-797. DOI: 10.1002/mrc.3884 WOS Scopus РИНЦ OpenAlex

Dates:

Published print:

Dec 12, 12

Identifiers:

Web of science:	WOS:000311378700003
Scopus:	2-s2.0-84869884308
Elibrary:	20491372
OpenAlex:	W1512637021

Citing:

DB	Citing
Scopus	18
OpenAlex	18
Web of science	19
Elibrary	18

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