Proton and carbon-13 NMR studies of conformational preferences in N-(2-pyridinyl)-2-pyridinecarboxamides
作者:Netai C Singha、D.N Sathyanarayana
DOI:10.1016/s1386-1425(98)00020-1
日期:1998.8
The H-1 and C-13 NMR spectra, molecular conformation and intermolecular association of N-(2-pyridinyl)-2-pyridinecarboxamides and 2-pyridinecarboxamide are discussed. The H-1 NMR spectra have been analyzed with the aid of COSY spectra and the C-13 spectra with the aid of HETCOR, proton coupled spectra and C-13-H-1 coupling constants. In concentrated CDCl3 solution, N-(2-pyridinyl)-2-pyridinecarboxamides dimerise by intermolecular association. (C) 1998 Elsevier Science B.V. All rights reserved.
Six-coordinate CoIII and four-coordinate MII (M = Co, Zn) mixed-valence dimers supported by a deprotonated pyridine amide ligand: magnetism of a CoIIICoII complex and C–H⋯O/Cl/Br interactions
Using a pyridine amide ligand 4-methyl-2-N-(2-pyridyl)carbamoyl}pyridine (HL), in its deprotonated form, binuclear mixed-valence homonuclear bimetallic complexes [CoIII,II2(L)3(X)]X·S [X = Cl (1); X = Br, S = CH3OH (2)] and heteronuclear bimetallic complex [CoIIIZnII(L)3(Cl)]Cl·CH3OH·5H2O (3) have been synthesized. Structural analysis revealed that trivalent cobalt is in distorted octahedral and bivalent