Cyclopalladated binuclear complexes of schiff bases

Refluxing palladium acetate with Schiff bases C6H5CH=NMe (1), C6H5CH=N Bun (2), 4-MeC6H4CH=NBun (3), 4-OCH3C6H4CH=NBun (4), 3,4-(OMe)2C6H3CH=N Bun (5) and 2,4-(OMe)2C6H3CH=NBun (6) in acetic acid followed by metathesis with LiCl on methanol gave chloro-bridged cyclopalladated complexes 1a-6a. The reactions of these chloro-bridged complexes with binucleating ligands such as 4,4′-bipyridine, 1,1,2,2-tetra-acetyl ethane,N,N′-bis(2-hydroxybenzylidene)-1,4-diaminobutane, N,N′-bis(2-hydroxy-3-t-butyl-5-methylbenzylidene)-1,4-diaminobutane, N,N′-bis(2-hydroxy-5-methyl-α-phenylbenzylidene)-1,4-diaminobutane and 2-hydroxybenzalazine gave binuclear cyclopalladated complexes. All the complexes were analysed by means of IR, 1H and 13C NMR and H-H COSY NMR spectroscopic techniques. Copyright © 1996 Elsevier Science Ltd.