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1.  2-Amino-6-(quinoline-2-carboxamido)­pyridinium nitrate 
In the title salt, C15H13N4O+·NO3 −, an extensive network of N—H⋯N, N—H⋯O and C—H⋯O hydrogen-bond inter­actions are observed throughout the structure. Further stabilization is obtained by π–π stacking inter­actions between inversion-related quinoline systems and inversion-related pyridine rings, with respective centroid–centroid distances of 3.5866 (6) and 3.3980 (6) Å.
doi:10.1107/S1600536812036562
PMCID: PMC3435834  PMID: 22969680
2.  N,N′-(4,5-Dimethyl-1,2-phenyl­ene)bis­(pyridine-2-carboxamide) 
In the title compound, C20H18N4O2, the dihedral angles between the central benzene ring and the pyridine rings are 57.55 (6) and 22.05 (8)°. The mol­ecular conformation is stabilized by intra­molecular N—H⋯N inter­actions and in the crystal structure an inter­molecular asymmetric cyclic hydrogen-bonding association involving both amide N—H donors and a common amide O-atom acceptor gives a chain extending along the c axis.
doi:10.1107/S1600536812035064
PMCID: PMC3435751  PMID: 22969622

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