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Determination of the hyperfine coupling with the remote nitrogen in the VO2+—(imidazole)4 complex by ESEEM spectroscopy

✍ Scribed by Sergei A. Dikanov; Christian Burgard; Jürgen Hüttermann

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
485 KB
Volume
212
Category
Article
ISSN
0009-2614

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✦ Synopsis

Electron spin echo envelope modulation experiments are presented from "N-substituted VW'+-( imidazole)4 complexes which demonstrate the interaction of the paramagnetic ion with the remote, weakly coupled ring nitrogen. The hypertine parameters derived show that the interaction is about twenty times smaller than with the directly coordinated nitrogen of imidazole, a ratio comparable to that derived from known values for Cu'+-(imidazole)+ These findings question results reported from previous ENDOR work on V02+-( imidazole),.

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Determination of the ϕ angle in a peptid
Determination of the ϕ angle in a peptide backbone by NMR spectroscopy with a combination of homonuclear and heteronuclear coupling constants
✍ Peter Schmieder; Horst Kessler 📂 Article 📅 1992 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 393 KB 👁 1 views

## Abstract The ϕ angle in a cyclic peptide is determined by the combined use of homonuclear and heteronuclear coupling constants. Two of the four coupling constants that define the ϕ angle in a peptide are determined exactly, two qualitatively. Via Karplus‐type equations, they are transformed into