Palladium(ii) mononuclear and palladium(ii)/ruthenium(ii) heterodinuclear complexes containing 2-quinolyl-substituted (pyridine-2-carbonyl)hydrazoneElectronic supplementary information (ESI) available: Experimental details, tables of crystal data and selected structural parameters, UV-vis absorption spectra of complexes 1-3, a cyclic voltammogram and 31P NMR spectra of complex 3, and crystallographic data in CIF format. CCDC 1406105-1406108. For ESI and crystallographic data in CIF or other elec

A reaction of [PdCl 2 (cod)] (cod = 1,5-cyclooctadiene) and an E / Z mixture of quinoline-2-carbaldehyde (pyridine-2-carbonyl)hydrazone (HL) gave two kinds of Pd II mononuclear complexes, [PdCl( Z -L-κ 3 N , N ′, N ′′)] ( 1 ) and [PdCl 2 ( E -HL′-κ 2 N , N ′)] ( 2 ), where L − is the deprotonated hydrazonate anion and HL′ is the quinolinium-hydrazonate zwitterionic form of HL. Complex 2 is gradually converted to 1 in solution, and complex 1 is a good precursor to prepare a Pd II /Ru II heterodinuclear complex bridged by hydrazonate, trans (Cl,Cl)-[RuCl 2 (PPh 3 ) 2 (μ-L)PdCl] ( 3 ). Two mononuclear Pd II complexes and a heterodinuclear Pd II /Ru II complex bearing the hydrazone-derived ligand were prepared and their structures and properties were characterized.