## Two new experiments for the assignment and determination of 1J(13C,'3C) coupling constants of H-C-C fragments at natural isotope abundance are presented which exploit proton equilibrium polarization and proton signal intensity. The first experiment, which represents a J-resolved modification of
One-Bond 55Mn,13C Coupling Constants, a Correction
✍ Scribed by Daniel Rentsch; Wolfgang von Philipsborn; Vladimir Torocheshnikov
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 279 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Previously published one-bond 55Mn,13C coupling constants have been recalculated using a revised lineshape Btting program, QUADR. The accuracy of the new data was confirmed by the simulation of quadrupole-broadened but resolved 13C and "F spectra of the model complexes K,[Co(CN),] and Li(AsF,j. The 55Mn,13C coupling constants lie in the range 128-189 Hz for Mn-CO bonds, 57-114 Hz for Mn-C(spz) bonds and 35-79 Hz for Mn--C(sp3) bonds.
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13C and 17O chemical shifts and 55Mn,13C coupling constants of nine pentacarbonylmanganese complexes (6È14), 13 tetracarbonylmanganese complexes (15È27) and Ðve tetra-RMn(CO) 5 RMn(CO) 4 PR 3 @ carbonylmanganacycle complexes (1aÈe) were determined and are discussed in terms of p-inductive substituen
Full NMR spectral characteristic of eight phosphoric amides is presented. The results show that the geminal coupling constants are strongly inÑuenced by the atom located between the coupled nuclei. SpinÈspin interactions 2J(31P,13C) seem to be transmitted in investigated rings mainly by the two-bond