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In the title compound, C13H14N4O2, which has approximate mirror symmetry, the dihedral angles between the triazole ring and the cyclo­propane and pyridine rings are 87.1 (2) and 7.60 (9)°, respectively. In the crystal, inversion dimers linked by pairs of both C—H...N and C—H...O inter­actions generate R22(6) and R22(18) loops, respectively. Further C—H...N inter­actions form R22(10) loops and link the dimers into [110] chains.

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The title compound, [Cd2Cl4(C18H14N4O)2], was obtained from the reaction of Cd(NO3)2·4H2O with 2-phenyl­pyridine­keton picolinoyl hydrazone and sodium chloride. Each Cd2+ cation is coordinated by two N atoms and one O atom of the tridentate ligand and three chloride anions, forming a distorted CdNOCl3 octahedron. Each pair of adjacent metal cations is linked by two bridging chloride ligands, resulting in a dinuclear complex unit. The mol­ecular conformation is stabilized by intra­molecular N—H...N and C—H...O hydrogen bonds. In the crystal, mol­ecules are linked by nonclassical C—H...O and C—H...Cl hydrogen bonds into a three-dimensional network. In addition, π–π stacking inter­actions [centroid–centroid distances = 3.777 (2) and 3.631 (2) Å] contribute to the stabilization of the crystal packing.

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The title Schiff base, C14H11NO3, crystallizes as a zwitterion (i.e. proton transfer from the carb­oxy­lic acid group to the imine N atom). The dihedral angle between the aromatic rings is 19.59 (6)° and an intra­molecular N—H...O hydrogen bond closes an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R24(24) loops. The dimers are linked by C—H...O inter­actions, generating (211) sheets.

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In the title compound, C16H12O5, synthesized from isopthaloyl chloride and 2′-hy­droxy­aceto­phenone, the dihedral angle between the planes of the aromatic rings is 71.37 (9)°. In the crystal, carb­oxy­lic acid inversion dimers generate R22(8) loops. The dimers are linked by C—H...O inter­actions, generating (101) sheets.
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