Aqueous Shift Reagents for High-Resolution Cationic Nuclear Magnetic Resonance. 2. 25Mg, 39K, and 23Na Resonances Shifted by Chelidamate Complexes of Dysprosium (III) and Thulium(III)

Martin M. Pike; David M. Yarmush; James A. Balschi; Robert E. Lenkinski; Charles S. Springer

doi:10.1021/ic00159a010

Aqueous Shift Reagents for High-Resolution Cationic Nuclear Magnetic Resonance. 2. 25Mg, 39K, and 23Na Resonances Shifted by Chelidamate Complexes of Dysprosium (III) and Thulium(III)

Martin M. Pike, David M. Yarmush, James A. Balschi, Robert E. Lenkinski, Charles S. Springer

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Abstract

The tris complexes of anions of chelidamic acid (H₃CA, 4-hydroxypyridine-2,6-dicarboxylic acid) with dysprosium(III) and thulium(III) have been tested as aqueous shift reagents for the NMR peaks of metal cations. The Dy(CA)36- complex was observed to produce significant upfield isotropic hyperfine shifts of the 25Mg2+, 39K+, and 23Na+ resonances (as well as that of 87Rb+ and the 14N resonance of NH₄+). The Tm(CA)36- complex produces a downfield shift of the 23Na+ peak. The shifts are produced by an interaction between cation and shift reagent anion, which is labile on the chemical shift NMR time scale. The shifts are strongly pH dependent due to protonation of the coordinated ligands.

Original language	English (US)
Pages (from-to)	2388-2392
Number of pages	5
Journal	Inorganic Chemistry
Volume	22
Issue number	17
DOIs	https://doi.org/10.1021/ic00159a010
State	Published - Aug 1983
Externally published	Yes

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Physical and Theoretical Chemistry
Inorganic Chemistry

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Aqueous Shift Reagents for High-Resolution Cationic Nuclear Magnetic Resonance. 2. 25Mg, 39K, and 23Na Resonances Shifted by Chelidamate Complexes of Dysprosium (III) and Thulium(III). / Pike, Martin M.; Yarmush, David M.; Balschi, James A. et al.
In: Inorganic Chemistry, Vol. 22, No. 17, 08.1983, p. 2388-2392.

Research output: Contribution to journal › Article › peer-review

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abstract = "The tris complexes of anions of chelidamic acid (H3CA, 4-hydroxypyridine-2,6-dicarboxylic acid) with dysprosium(III) and thulium(III) have been tested as aqueous shift reagents for the NMR peaks of metal cations. The Dy(CA)36- complex was observed to produce significant upfield isotropic hyperfine shifts of the 25Mg2+, 39K+, and 23Na+ resonances (as well as that of 87Rb+ and the 14N resonance of NH4+). The Tm(CA)36- complex produces a downfield shift of the 23Na+ peak. The shifts are produced by an interaction between cation and shift reagent anion, which is labile on the chemical shift NMR time scale. The shifts are strongly pH dependent due to protonation of the coordinated ligands.",

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AU - Pike, Martin M.

AU - Yarmush, David M.

AU - Balschi, James A.

AU - Lenkinski, Robert E.

AU - Springer, Charles S.

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N2 - The tris complexes of anions of chelidamic acid (H3CA, 4-hydroxypyridine-2,6-dicarboxylic acid) with dysprosium(III) and thulium(III) have been tested as aqueous shift reagents for the NMR peaks of metal cations. The Dy(CA)36- complex was observed to produce significant upfield isotropic hyperfine shifts of the 25Mg2+, 39K+, and 23Na+ resonances (as well as that of 87Rb+ and the 14N resonance of NH4+). The Tm(CA)36- complex produces a downfield shift of the 23Na+ peak. The shifts are produced by an interaction between cation and shift reagent anion, which is labile on the chemical shift NMR time scale. The shifts are strongly pH dependent due to protonation of the coordinated ligands.

AB - The tris complexes of anions of chelidamic acid (H3CA, 4-hydroxypyridine-2,6-dicarboxylic acid) with dysprosium(III) and thulium(III) have been tested as aqueous shift reagents for the NMR peaks of metal cations. The Dy(CA)36- complex was observed to produce significant upfield isotropic hyperfine shifts of the 25Mg2+, 39K+, and 23Na+ resonances (as well as that of 87Rb+ and the 14N resonance of NH4+). The Tm(CA)36- complex produces a downfield shift of the 23Na+ peak. The shifts are produced by an interaction between cation and shift reagent anion, which is labile on the chemical shift NMR time scale. The shifts are strongly pH dependent due to protonation of the coordinated ligands.

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Aqueous Shift Reagents for High-Resolution Cationic Nuclear Magnetic Resonance. 2. 25Mg, 39K, and 23Na Resonances Shifted by Chelidamate Complexes of Dysprosium (III) and Thulium(III)

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