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In the title compound, [Zn(C8H5N2O2)2(H2O)], the ZnII ion is coordinated in each case by a carboxyl­ate O atom and an imidazole N atom from two different benzimidazole-2-carboxyl­ate (BIC) ligands and one water O atom in a trigonal-bipyramidal geometry. In the complex mol­ecule, the two benzimidazole planes are twisted, making a dihedral angle of 55.93 (11)°. The three-dimensional framework is organized by inter­molecular N—H...O hydrogen bonding and O—H...O inter­actions and π–π inter­actions between adjacent benzimidazole rings [centroid–centroid distance = 3.586 (3) Å].

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In the title compound, C19H21NO3, the dihedral angle between the mean planes of the two benzene rings is 38.13 (12)°. The furan ring adopts an envelope-like conformation with the C atom bonded to the dimethyl groups displaced by 0.356 (2) Å from the plane through the other four atoms. In the crystal, mol­ecules are linked into inversion dimers by weak C—H...O inter­molecular inter­actions.

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In the title mol­ecule, C12H12N6, the dihedral angles between the pyridine rings and the central dimethan­imine–hydrazine group are 0.30 (3) and 13.94 (3)°. Two intra­molecular N—H...N hydrogen bonds stabilize the planar conformation of one pyridine ring with respect to its hydrazine-residue neighbour, whereas the other pyridine ring and an N-bonded H atom are rotated out of the plane and link the mol­ecules into inter­molecular N—H...N chains propagating in [010].
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