Synthesis, spectroscopic characterization, reactive properties by DFT calculations, molecular dynamics simulations and biological evaluation of Schiff bases tethered 1,2,4-triazole and pyrazole rings

Co(ii) and Zn(ii) pyrazolyl-benzimidazole complexes with remarkable antibacterial activity

Three pseudopolymorphs based on a coordination complex of a pyrazolyl-benzimidazole ligand have been synthesized and characterized by single crystal X-diffraction, and showed remarkable antibacterial properties.

Crystal structure and Hirshfeld surface analysis of N-{2-[(E)-(4-methyl-benzyl-idene)amino]-phen-yl}-2-(5-methyl-1-H-pyrazol-3-yl)acetamide hemihydrate

The asymmetric unit of the title compound, C20H20N4O·0.5H2O, contains two independent organic mol-ecules (1 and 2) and a water mol-ecule of crystallization. The two mol-ecules differ primarily in the dihedral angles between the aromatic rings, which are 7.79 (7) and 29.89 (7)° in mol-ecules 1 and 2, respectively. In each mol-ecule there is intra-molecular C-H⋯O hydrogen bond forming an S(6) ring motif. In mol-ecule 1 there is an intra-molecular N-H⋯π(pyrazole) inter-action and an intra-molecular C-H⋯π(pyrazole) inter-action present. Mol-ecule 1 is linked to mol-ecule 2 by a C-H⋯π(benzene ring) inter-action. An intra-molecular N-H⋯N hydrogen bond and an intra-molecular C-H⋯N hydrogen bond are also present in mol-ecule 2. In the crystal, the three components are linked by Owater-H⋯N, N-H⋯Owater and N-H⋯N hydrogen bonds, forming chains along the [100] direction. The chains are linked by C-H⋯O and C-H⋯N hydrogen bonds, forming layers parallel to the ab plane. Finally, the layers are linked by C-H⋯π inter-actions, forming a three-dimensional structure.