Alcohol-soluble functional vic-dioxime bearing alcoholhexylsulfanyl moieties: preparation, spectroscopy and electrochemistry

Abstract

A new alcohol soluble functionalized vic-dioxime, bis-[(1-hydroxyhexyl)-(8,9-hydroxyimino)-7,10-dithiahexacosane (LH 2 ), and its alcohol-soluble mono and dinuclear complexes (Ni II , Cu II , Co II , Mn II , Pd II and UO 2 II ) have been prepared from 6-mercapto-1-hexanol and (E,E)-dichloroglyoxime under high dilution basic conditions. Reactive polyalcohol moieties appended at the periphery of the oxime containing two different heteroatoms (S-, O-), serve as a weak exocyclic binding sites for Pd II and Ag I metal ions and also provide solubility for the vic-dioxime complexes in low molecular-weight alcohols. Both mono-nuclear (LH) 2 M and homodinuclear (LH) 2 (UO 2 ) 2 (OH) 2 and heterotrinuclear (LH) 2 MM 2 ¢ Xn, where M = Co II M¢ = Pd II , X = Cl ) , n = 4 and Ag I X = NO 3 ) , n = 2) complexes have been obtained with a 1:2, 2:2, 3:2 metal/ligand ratio, respectively. Electronic spectra of the modified vic-dioximes exhibit monitorable changes in UV. All mono and dinuclear-complexes are soluble in common organic solvents. The elemental analysis, 1 H-n.m.r, i.r., u.v-vis, and f.a.b.-m.s data and by cyclic and differential pulse voltammetry measurements are presented.

Synthesis of novel tetraoxime derivative with hydrazone side groups and its metal complexes

“…This information and the data obtained from the microanalyses show that the complex of Co(II) can be square-planar. 13,23,27,37,38 According to the above results, square-planar geometries for the Ni(II), Co(II), and Cu(II) complexes, and a tetrahedral geometry for the Zn(II) complex, are proposed. On the basis of the above analyses, the following structures (Figures 1-3) may be suggested for the complexes.…”

Novel vic-dioxime ligands and their poly-metal complexes bearing 1,8-diamino-3,6-dioxaoctane: synthesis, characterization, spectroscopy and electrochemistry

“…Consequently, we may conclude that both of these d 8 metal ions are coordinated with the dioximato donor sites in square planar geometry[14,26]. The carbon resonances of oxime groups are found at 150.The elemental analysis result shows that the polymer complexes have been obtained with 1:1 metal/ligand ratio.Best evidence of the polymer formation is the disappearance of the =N-OH signals in the ligands and the existence of intra-molecular D 2 O-exchangeable H-bridge (O-HÁÁÁO) protons, which were observed by a new signals at d = 15.53 ppm for [Ni(L 1 SL 1 )] n and d = 15.43 ppm for [Ni(L 2 SL 2…”

Synthesis, characterization, thermal, and redox properties of a vic-dioxime and its metal complexes

“…* and n! * transitions of -C¼N and chargetransfer arising from metal to ligand or ligand to metal [34,35]. The absorption spectrum of 4 has a band around 480 nm, possibly due to d-d transition from a distorted octahedral stereochemistry.…”