A water-soluble multisite ionophore ligand bearing pyridine and aminothiophenol functionality. Synthesis, spectroscopy and electrochemistry of its complexes, and peripheral reactivity of the (E,E)M (M = Ni) complex with Pd2+ and Ag+

Abstract

The design, synthesis and coordination of a novel multisite vic-dioxime compound, LH2 containing flexible pyridine substituents and amitiophcnylsulfanyl moieties on the periphery, facilitating solubility in water as pyridinium hydrochloride salt are described. LH2 was prepared by the reaction between 2-(2-pyridylethylamino)-benzenethiol and (E,E)-dichloroglydioxime. Mononuclear [(E,E)M] (M = Ni-II, Cu-II. Co-II, Fe-II and Mn-II) and dinuclear uranyl (UO2II) complexes of LH2 were isolated and characterized with metal:ligand ratios of 1:2 and 2:2. respectively. The reaction of Na2PdCl4 . 3H(2)O and AgNo3 in DMF with the mononuclear complex, (LH)(2)Ni, resulted in the formation of the heterotrinuclear complexes [Pd2Ni(LH)(2)]Cl-4 and [Ag2Ni(LH)(2)](NO3)(2). The complexes were characterized by elemental analysis, H-1-n.m.r., u.v.-vis. spectroscopy, i.r., and MS (LSIMS). The redox properties of the complexes were studied by cyclic voltammetry.