Acid catalyzed condensation reactions between benzil and 4-bromoaniline and benzil and anisidine, produced the diimine ligands bis(4-bromophenylimino)benzil and bis(4-methoxyphenylimino)benzil respectively. Both ligands were reacted with Pd(DMSO)Cl2 in methanol to produce the corresponding palladium(II) diimine complex. The X-ray crystal structure of bis(4-methoxyphenylimino)benzil and its palladium(II) complex were determined. The latter showed that the C-N double bond of the ligand can exist as cis- and trans-isomers. The photophysical properties of the diimine ligands and their palladium(II) complexes were explored in acetonitrile solution at room temperature. The diimine ligands had absorption bands in the range 264-340 nm and had emission maxima in the range 362-400 nm. The palladium(II) complex prepared from bis(4-bromophenylimino)benzil was not emissive while the one prepared from bis(4-methoxyphenylimino)benzil showed weak luminescence at 77 K.

Synthesis, X-ray structure analysis and photophysical characterization of benzil-based diimine ligands and their palladium (II) complexes

243rd National Meeting (2012)

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