(E)-4-Chloro-N'-[1-(4-hydroxy-phenyl)-ethylidene]benzohydrazide

Cytotoxic homoleptic Ti(iv) compounds of ONO-type ligands: synthesis, structures and anti-cancer activity

Reacting variously substituted dianionic tridentate ONO-type acylhydrazone ligands with titanium(iv) tetra(isopropoxide) gave a new class of eight homoleptic titanium(iv) compounds showing exceptional stability and promising cytotoxicity.

4-Chloro-N'-(2-hy-droxy-4-meth-oxy-benzyl-idene)benzohydrazide methanol monosolvate

The title compound, C₁₅H₁₃ClN₂O₃·CH₃OH, was synthesized by the condensation reaction of 2-hy­droxy-4-meth­oxy­benzaldehyde with 4-chloro­benzohydrazide in methanol. The Schiff base mol­ecule displays a trans configuration with respect to the C=N and C—N bonds. The dihedral angle between the two benzene rings is 5.3 (2)°. In the crystal, mol­ecules are linked by N—H⋯O and O—H⋯O hydrogen-bond inter­actions into chains running parallel to the a axis. An intra­molecular O—H⋯N hydrogen bond is observed.

N′-(5-Bromo-2-hydroxybenzylidene)-4-methylbenzohydrazide

The mol­ecule of the title compound, C₁₅H₁₃BrN₂O₂, displays an E conformation with respect to the C=N double bond and the dihedral angle between the planes of the benzene rings is 3.1 (2)°. An intra­molecular O—H⋯N inter­action generates an S(6) ring. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming C(4) chains along the c-axis direction.

N'-(2-Hydr-oxy-4-methoxy-benzyl-idene)isonicotinohydrazide

The title compound, C(14)H(13)N(3)O(3), was synthesized by the condensation reaction of 2-hydr-oxy-4-methoxy-benzaldehyde with isonicotinohydrazide in a methanol solution. The mol-ecule of the compound displays a trans configuration with respect to the C=N and C-N bonds. The dihedral angle between the benzene and the pyridine rings is 27.3 (2)°. In the crystal, mol-ecules are linked by N-H⋯N inter-actions into zigzag chains with graph-set notation C(7) along [010]. An intra-molecular O-H⋯N hydrogen bond is observed.

3-Hydr-oxy-N'-(5-hydr-oxy-2-nitro-benzyl-idene)-2-naphthohydrazide

The mol-ecule of the title compound, C(18)H(13)N(3)O(5), displays an E configuration with respect to the C=N double bond. The dihedral angle between the benzene ring and the naphthyl system is 1.1 (2)°. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds, forming a three-dimensional network.

N'-(2-Chloro-5-nitro-benzyl-idene)isonicotinohydrazide

The title compound, C(13)H(9)ClN(4)O(3), was synthesized by the condensation reaction of 2-chloro-5-nitro-benzaldehyde with isonicotinohydrazide in a methanol solution. The mol-ecule of the compound displays a trans configuration with respect to the C=N and C-N bonds. The dihedral angle between the benzene and pyridine rings is 12.1 (2)°. In the crystal structure, adjacent mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds, forming dimers.