Aqueous shift reagents for high-resolution cationic nuclear magnetic resonance. III. Dy(TTHA) 3−, Tm(TTHA) 3−, and Tm( PPP) 27

• Published in: Journal of magnetic resonance (1969) Vol. 56; no. 1; pp. 33 - 47
• Main Authors: Chu, Simon C, Pike, Martin M, Fossel, Eric T, Smith, Thomas W, Balschi, James A, Springer, Charles S
• Format: Journal Article
• Language: English
• Published: Orlando, FL Elsevier Inc 1984; Academic Press
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Nuclear resonance and relaxation; Physics; RR; Ln; EDTA 4; DPA 2; TTHA 6; Δν 1 2; PPP 5; HTEA; I; NTA 3; CA 3; SR; High resolution; Nitrogen heterocycle; Organic ligand; NMR spectrometry; Solute effect; Inorganic compound; Inorganic cation; Shift reagent; Chemical shift; Thulium Complexes; Carboxylate; PH; Aqueous solution; Dysprosium Complexes; Lanthanide Complexes
• ISSN: 0022-2364; 1557-8968
• DOI: 10.1016/0022-2364(84)90189-6

The isotropic hyperfine shifts induced in the 23Na + resonance by the shift reagents Dy(DPA) 3 3−, Dy(NTA) 2 3−, Dy(PPP) 2 7−, Tm(PPP) 2 7−, Dy(TTHA) 3−, and Tm(TTHA) 3− are compared under similar conditions. The last three are introduced as shift reagents in this study. The Dy(PPP) 3 7− and Tm(PPP) 2 7− ions cause the largest shifts. However, these shifts are very pH dependent and are readily decreased by the presence of Ca 2+ or Mg 2+ ions. The Dy(TTHA) 3− and Tm(TTHA) 3− ions produce quite large shifts which are independent of pH (between 5.5 and 12) and less sensitive to Ca 2+ and Mg 2+. For a given chelate ligand, the analogous Dy(III) and Tm(III) complexes cause hyperfine shifts in opposite directions. However, while the Dy(PPP) 2 7− ion induces an upfield shift, the Dy(TTHA) 3− ion induces a downfield shift. Some data on shifts of the 25Mg 2+, 39K +, and 87Rb + resonances are also presented. In addition the 14N peak of NH 4 + can be quite effectively shifted.