New Cu(II), Co(II), Ni(II) complexes with aroyl-hydrazone based ligand. Synthesis, spectroscopic characterization and in vitro antibacterial evaluation

N'-(4-Diethyl-amino-2-hy-droxy-benzyl-idene)-4-(dimethyl-amino)-benzo-hydrazide methanol monosolvate

The title compound, C(20)H(26)N(4)O(2)·CH(3)OH, was prepared by the reaction of 4-diethyl-amino-2-hy-droxy-benzaldehyde with 4-(dimethyl-amino)-benzohydrazide. The dihedral angle between the two benzene rings is 13.6 (3)° and an intra-molecular O-H⋯N hydrogen bond generates an S(6) ring. In the crystal, the hydrazone and methanol mol-ecules are linked through inter-molecular O-H⋯O and N-H⋯O hydrogen bonds, forming chains along a.

4-Meth-oxy-N'-(4-meth-oxy-benzyl-idene)benzohydrazide

The title compound, C(16)H(16)N(2)O(3), was prepared by the reaction of 4-meth-oxy-benzaldehyde with 4-meth-oxy-benzohydrazide in methanol. The dihedral angle between the two benzene rings is 3.1 (3)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into C(4) chains along the b axis.

(E)-N′-(3-Hydroxybenzylidene)-3-nitrobenzohydrazide

The title compound, C₁₄H₁₁N₃O₄, was prepared by the reaction of 3-nitro­benzohydrazide with 3-hy­droxy­benzalde­hyde. The mol­ecule adopts an E configuration about the C=N bond. The dihedral angle between the two benzene rings is 32.3 (2)°. In the crystal, the mol­ecules are linked through inter­molecular N—H⋯O, O—H⋯N, and O—H⋯O hydrogen bonds, forming chains in the a-axis direction.

N′-(2-Chlorobenzylidene)-2-fluorobenzohydrazide

The title hydrazone compound, C₁₄H₁₀ClFN₂O, adopts an E configuration about the C=N double bond. The dihedral angle between the two substituted benzene rings is 11.6 (2)°. The F atom is disordered over two sites with occupancies of 0.488 (2) and 0.512 (2). In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the a axis. C—H⋯F and C—H⋯O inter­actions also occur.

N′-(2-Hydroxy-3,5-diiodobenzylidene)-2-methylbenzohydrazide

The asymmetric unit of the title compound, C₁₅H₁₂I₂N₂O₂, contains two independent mol­ecules in which the dihedral angles between the two benzene rings are 62.4 (7) and 41.1 (7)°. Intra­molecular O—H⋯N hydrogen bonds generate S(6) ring motifs in each mol­ecule. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the a axis.

N′-(3,5-Dibromo-2-hydroxybenzylidene)-2-methylbenzohydrazide

The asymmetric unit of the title compound, C₁₅H₁₂Br₂N₂O₂, contains two independent mol­ecules in which the dihedral angles between the benzene rings are 49.5 (7) and 66.4 (7)°. Intra­molecular O—H⋯N hydrogen bonds generate S(6) ring motifs in each mol­ecule. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the b axis.

4-Dimethylamino-N′-(3-pyridylmethylidene)benzohydrazide

The title compound, C₁₅H₁₆N₄O, was prepared by the reaction of pyridine-3-carbaldehyde with 4-dimethyl­amino­benzo­hydrazide in methanol. The dihedral angle between the pyridine and the benzene rings is 5.1 (3)°. In the crystal structure, the hydrazone mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the b axis.

N'-(4-Hy-droxy-benzyl-idene)-2-methyl-benzohydrazide

The title hydrazone compound, C(15)H(14)N(2)O(2), was prepared by the condensation of 4-hy-droxy-benzaldehyde with 2-methyl-benzohydrazide in methanol. The dihedral angle between the two benzene rings is 42.3 (2)°. In the crystal structure, mol-ecules are linked by inter-molecular O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds, forming a three-dimensional framework.