Abstract
Three tridentate mono-anionic Schiff base ligands of the O,N,S-donor set, namely 3,5-dibromo-N-(2-(methylsulfanyl)phenyl)salicylaldimine (HL1), 5-chloro-N-(2-(methyl-sulfanyl)phenyl)salicylaldimine (HL2), and 3,5-di-tert-butyl-N-(2-(methylsulfanyl)phenyl)-salicylaldimine (HL3) were prepared. Reaction of [Ru(PPh3)3Cl2] and equal equiv. of HL1 in tetrahydrofuran in the presence of triethylamine afforded complex [Ru(L1)(PPh3)2Cl] (1) with two triphenylphosphine ligands trans to each other. Treatment of HL2 with equal equiv. of [RuHCl(CO)(PPh3)3], [Ru(CO)2Cl2]n or cis-[RuCl2(DMSO)4] (DMSO = dimethylsulfoxide) gave complexes [Ru(L2)(CO)(PPh3)Cl] (2), [Ru(L2)(CO)2Cl] (3), and [Ru(L2)(DMSO)2Cl] (4), respectively. Interactions between HL3 and [Ru(CO)2Cl2]n, [Ru(COD)Cl2]2 (COD = 1,5-cyclooctadiene), or RuCl3·3H2O resulted in isolation of ruthenium(II) complexes [Ru(L3)(CO)2Cl] (5), [Ru(L3)(COD)Cl] (6), and [Ru(L3)2] (7), respectively. The structures of complexes 1–7 have been unambiguously established by single-crystal X-ray crystallography. The electrochemical properties of complexes 1–7 were also investigated.
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