Palladium(II) complexes of hydrazones derived from 4-dodecyloxybenzoylhydrazine with some aliphatic and aromatic aldehydes and their mesogenic behaviour

Abstract

Hydrazinato complexes, Pd[C₁₂H₂₅OC₆H₄C(O)=N-N=CHR]₂, have been formed by the reaction of ligand precursor, C₁₂H₂₅OC₆H₄C(=O)NHNH₂, with some aliphatic and aromatic aldehydes such as formaldehyde, acetaldehyde, butyraldehyde, crotonaldehyde, cinnamaldehyde, benzaldehyde, 4-chlorobenzaldehyde, 2-chlorobenzaldehyde and 2, 4-dimethoxybenzaldehyde and subsequent addition of palladium(II) chloride. The complexes have also been formed by the direct reaction of the ligand, C₁₂H₂₅OC₆H₄C(=O)NH-N=CHR, with palladium(II) chloride. All the complexes are square planar in nature. Complex Pd[C₁₂H₂₅OC₆H₄C(O)=N-N=CHCH₂CH₂CH₃]₂ shows enantiotropic behaviour while the complexes Pd[C₁₂H₂₅OC₆H₄C(O)=N-N=CHCH=CHC₆H₅]₂ and Pd[C₁₂H₂₅OC₆H₄C(O)=N-N=CHC₆H₃(OCH₃)₂]₂ show monotropic behaviour.