Abstract
The synthesis and characterization of trans/ cis-[RuCl 2(dppf)(diimines)], dppf = 1,1′-bis(diphenylphosphino)ferrocene; diimines = 2,2′-bipyridine ( trans/ cis-( 1)), the new complexes with 4,4′-dimethyl-2,2′-bipyridine ( trans/ cis-( 2)) and 1,10-phenanthroline ( cis-( 3)) are presented. The complexes were synthesized using two routes and the trans/ cis-isomer formation is dependent upon conditions and the precursor applied. The trans-isomer (kinetic) readily isomerizes to the cis-isomer (thermodynamic) when exposed to light (fluorescent) and this process was followed by cyclic voltammetry and UV–vis. The electrochemical studies on these complexes reveal that Fe (III)/Fe (II) couples are insensitive to the isomer ( trans/ cis) formed, but the Ru (III)/Ru (II) couples are dependent on the isomer. Transfer-hydrogenation reactions for reduction of acetophenone were conducted using complexes cis-( 1) and cis-( 2) and the results are compared with that obtained for similar complexes. X-ray structure for cis-( 3) are presented and discussed.
Published Version
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