Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.001 Å R factor = 0.050 wR factor = 0.137 Data-to-parameter ratio = 34.6For details of how these key indicators were automatically derived from the article, see
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.048; wR factor = 0.159; data-to-parameter ratio = 20.9. organic compounds o3570 # 2007 International Union of Crystallography
Two Schiff base tetradentate ligands 4 and 5 were synthesized by condensation reactions of 4-hydroxy-3-methoxy-5-((2-nitrophenyl)diazenyl) benzaldehyde 1 with 1,2-diaminoethane 2 and 1,2-diaminobenzene 3, respectively. Treatment of synthesized ligands with the manganese (II) chloride MnCl2 6 gave two complexes 7 and 8 of general formula ML. The synthesized ligands and their complexes were characterized by FTIR, UV-Vis, Mass spectroscopy, and elemental analysis. The biological activity of the synthesized compounds were tested. It was found that ligand 5 and the complexes 7 and 8 possess antibacterial activity against the gram –ve Proteus mirabilis.
Unusual effects of intramolecular hydrogen bonds and dipole interactions are investigated using FTIR, NMR and X-Ray crystallography analyses of some imines. These phenomena affect both FTIR absorptions and chemical shifts.
The asymmetric unit of the title compound, C22H20N2O4·H2O, comprises a substituted benzimidazole molecule and a water molecule of crystallization. The dihedral angles between the benzimidazole ring system and the two outer benzene rings are 16.54 (4) and 86.13 (4)°. The dihedral angle between the two hydroxy-substituted benzene rings is 82.20 (5)°. In the crystal structure, intermolecular O—H⋯O hydrogen bonds, involving the hydroxy groups and water molecules, form R
4
4(8) ring motifs, and link symmetry-related molecules into extended chains along the c axis. The crystal structure is further stabilized by weak intermolecular C—H⋯O hydrogen bonds, weak C—H⋯π and π–π stacking [centroid–centroid = 3.6495 (6)–3.7130 (6) Å] interactions. Intramolecular O—H⋯O and O—H⋯N interactions are also present.
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