Ruthenium(II) complexes of bis-guanidine ligands with substituted Schiff bases. Syntheses and characterization of [RuH(CO){k2-N,N-(2-HO-ArCH= NN)2CNH2}(PPh3)2] (Ar = C6H4-, 5-Cl-C6H3-, 3,5-Br2-C6H2-)

Condensation of N,N'-diaminoguanidine hydrochloride with two equivalents of salicylaldehyde, 5-chlorosalicylaldehyde and 3,5-dibromosalicylaldehyde in ethanol afforded corresponding guanidinium derivatives functionalized with 0,N-bidentate Schiff bases (2-HO-ArCH=NNH)(2)C=NH center dot HCl (Ar = C6H4, L1H center dot HCl; Ar = 5ClC(6)H(3), L2H center dot HCl; Ar = 3,5-Br2C6H2, L3H center dot HCl). Reactions of [RuHC1(CO)(PPh3)(3)] with one equivalent of L1H center dot HCl, L2H center dot HCl, and L3H center dot HCL in the presence of excess triethylamine (Et3N) in refluxing tetrahydrofuran gave the neutral ruthenium(II) complexes of the type [RuH(CO){K-2-N,N-(2-HO-ArCH=NN)(2)CNH2}(PPh3)(2)] (Ar = C6H4, 1; Ar = 5-C1C(6)H(3), 2; Ar = 3,5-Br2C6H2, 3) accordingly. X-ray crystal structure determinations are reported for complexes 1-3.