NDLI: Nanosized thermometric NMR sensors based on the paramagnetic complex ion pairs of lanthanides(III) for temperature determinations in low-polar nonaqueous solutions

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Nanosized thermometric NMR sensors based on the paramagnetic complex ion pairs of lanthanides(III) for temperature determinations in low-polar nonaqueous solutions

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Nanosized thermometric NMR sensors based on the paramagnetic complex ion pairs of lanthanides(III) for temperature determinations in low-polar nonaqueous solutions

Content Provider	Springer Nature Link
Author	Babailov, S. P.
Copyright Year	2008
Abstract	For temperature determination in solutions it is suggested that the temperature dependence of the paramagnetic lanthanide-induced shifts (LIS) in the NMR spectra on the ligand nuclei be used for [Ln(PTA)$_{2}$(18-crown-6)]$^{+}$[Ln(PTA)$_{4}$]$^{−}$ complex ion pairs formed in CCl$_{4}$, CDCl$_{3}$, CD$_{2}$Cl$_{2}$, CD$_{3}$C$_{6}$D$_{5}$, and C$_{2}$D$_{3}$N type low-polar solvents (Ln = La, Ce, Pr, Nd, Eu; PTA is the pivalyltrifluoroacetonato anion). It was found experimentally that the [Ln(PTA)$_{2}$(18-crown-6)]$^{+}$ complex cation molecules (Ln = Ce and Pr) proved most suitable for use as nanosized (≈1.1 nm) probes for temperature determinations in nonaqueous solutions. A linear dependence of the LIS on the $^{1}$H nuclei of different groups and the difference between the LIS corresponding to the CH$_{2}$ groups of the 18-crown-6 molecules and the CH groups of the PTA anions on the reciprocal temperature (1/T) was found. The LIS of the individual signals of different groups in Ln paramagnetic complexes (relative to the signals of the diamagnetic analogs, e.g., La or Lu) may be used for temperature control in the sample, although the temperature measurement error is smaller (≤ 0.04 K) when the difference between the LIS of the CH$_{2}$ and CH groups is used. Due to the high thermodynamic and kinetic stability combined with small sizes of [Ln(PTA)$_{2}$(18-crown-6)]$^{+}$[Ln(PTA)$_{4}$]$^{−}$ molecules in nonaqueous solutions, these compounds may be used as thermometric NMR sensors directly in reaction media for in situ control over temperature.
Starting Page	553
Ending Page	555
Page Count	3
File Format	PDF
ISSN	00224766
Journal	Journal of Structural Chemistry
Volume Number	49
Issue Number	3
e-ISSN	15738779
Language	English
Publisher	Springer US
Publisher Date	2008-09-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	lanthanide-induced shifts temperature dependence of LIS molar paramagnetic susceptibility lanthanides NMR magnetic resonance tomography nonaqueous solutions thermometric NMR sensors ion pairs Solid State Physics and Spectroscopy Atomic and Molecular Structure and Spectra Atoms, Molecules, Clusters and Plasmas Physical Chemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Physical and Theoretical Chemistry Inorganic Chemistry

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