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1H and 13C NMR and 1H NMR relaxation spectroscopy (RS) measurements are reported for the CDCl3 and CD 2Cl2 solutions of [La(NO3)3 (diaza-18-crown-6)] (I), [Pr(NO3)3 (diaza-18-crown-6)] (II) and [Nd(NO3)3 (diaza-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. Enantiomeric isomer interconversion in II is characterized by ΔH‡ = 21.5 ± 4 kJ mol-1. Studies of the values of the lanthanide-induced shifts and the longitudinal relaxation rate enhancement revealed that the structure of complexes in solution is similar to that reported for the [La(NO3)3(18-crown-6)] complex in the crystal state. Nevertheless, it appears that the principal values of the molar paramagnetic susceptibility tensor (χi) significantly differ in complexes II and III. The possible reasons for the different characteristics of these complexes are discussed.
| Язык оригинала | Английский |
|---|---|
| Страницы (с-по) | 25-29 |
| Число страниц | 5 |
| Журнал | Journal of Inclusion Phenomena and Macrocyclic Chemistry |
| Том | 43 |
| Номер выпуска | 1-2 |
| DOI | |
| Состояние | Опубликовано - 2002 |
| Опубликовано для внешнего пользования | Да |
Отпечаток
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
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Intramolecular dynamics of lanthanide(III) tetraoxadiaza macrocycle complexes in solution as studied by NMR. / Babailov, S. P.; Nikulina, L. D.; Krieger, J. H.
В: Journal of Inclusion Phenomena and Macrocyclic Chemistry, Том 43, № 1-2, 2002, стр. 25-29.Результат исследований: Материалы для журнала › Статья
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TY - JOUR
T1 - Intramolecular dynamics of lanthanide(III) tetraoxadiaza macrocycle complexes in solution as studied by NMR
AU - Babailov, S. P.
AU - Nikulina, L. D.
AU - Krieger, J. H.
PY - 2002
Y1 - 2002
N2 - 1H and 13C NMR and 1H NMR relaxation spectroscopy (RS) measurements are reported for the CDCl3 and CD 2Cl2 solutions of [La(NO3)3 (diaza-18-crown-6)] (I), [Pr(NO3)3 (diaza-18-crown-6)] (II) and [Nd(NO3)3 (diaza-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. Enantiomeric isomer interconversion in II is characterized by ΔH‡ = 21.5 ± 4 kJ mol-1. Studies of the values of the lanthanide-induced shifts and the longitudinal relaxation rate enhancement revealed that the structure of complexes in solution is similar to that reported for the [La(NO3)3(18-crown-6)] complex in the crystal state. Nevertheless, it appears that the principal values of the molar paramagnetic susceptibility tensor (χi) significantly differ in complexes II and III. The possible reasons for the different characteristics of these complexes are discussed.
AB - 1H and 13C NMR and 1H NMR relaxation spectroscopy (RS) measurements are reported for the CDCl3 and CD 2Cl2 solutions of [La(NO3)3 (diaza-18-crown-6)] (I), [Pr(NO3)3 (diaza-18-crown-6)] (II) and [Nd(NO3)3 (diaza-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. Enantiomeric isomer interconversion in II is characterized by ΔH‡ = 21.5 ± 4 kJ mol-1. Studies of the values of the lanthanide-induced shifts and the longitudinal relaxation rate enhancement revealed that the structure of complexes in solution is similar to that reported for the [La(NO3)3(18-crown-6)] complex in the crystal state. Nevertheless, it appears that the principal values of the molar paramagnetic susceptibility tensor (χi) significantly differ in complexes II and III. The possible reasons for the different characteristics of these complexes are discussed.
KW - Complexes of lanthanides
KW - Crown ethers
KW - Dynamic NMR
KW - Enthalpy of activation
KW - Molecular dynamics
UR - http://www.scopus.com/inward/record.url?scp=0347655703&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0347655703&partnerID=8YFLogxK
U2 - 10.1023/A:1020492027829
DO - 10.1023/A:1020492027829
M3 - Article
AN - SCOPUS:0347655703
VL - 43
SP - 25
EP - 29
JO - Journal of Inclusion Phenomena and Molecular Recognition in Chemistry
JF - Journal of Inclusion Phenomena and Molecular Recognition in Chemistry
SN - 1388-3127
IS - 1-2
ER -