53276-93-0

Upstream product

• 16023-50-0 benzil bis(thiosemicarbazone) 
• 6018-89-9 nickel(II) acetate tetrahydrate 
• 83864-14-6 nickel dichloride 

Relevant academic research and scientific papers

Spectroscopic and electrochemical properties of nickel(II), iron(III) and cobalt(II) complexes with benzilbisthiosemicarbazone - Importance of working conditions and the metal salt used in the final complex

Reactions of benzilbisthiosemicarbazone (LH6) with nickel, cobalt and iron chloride and nitrate give different complexes depending on the salts used and the working conditions. Reactions from nickel chloride give three complexes, 1, 2 and 3 when the solvent or the pH is modified. Complex 1 is obtained in ethanol under reflux, and in methanol, independently of temperature and also with basic medium. Complex 2 is formed by working in ethanol at room temperature. The ligand acts as a dianion in both complexes. In the presence of hydrochloric acid, the new isolated complex 3 presents the neutral form of the ligand. Reaction from nitrate yields only complex 1. Reactions with iron chloride give two new complexes with different formulae and grade of deprotonation in the ligand. For complex 4, obtained at room temperature, LH6 acts as an anion with a ligand-iron ratio of 2:1 and in its neutral form with a 1:1 ratio in complex 5, working under reflux. Reactions with iron nitrate yield complex 6, with the ligand in an intermediate situation, as anion but a nitrate remains. Complexes 7 and 8, with a 1:1 cobalt-ligand molar ratio are isolated from reactions with cobalt nitrate; both contain nitrate and ethanol or water to complete the co-ordination sphere. Attempts to get a macrocyclic thiosemicarbazone from reaction of benzil and LH6 in the presence of nickel or iron salt gave the complexes obtained, in absence of the dicarbonyl molecule. Electrochemical behaviour of complexes studied by cyclic voltammetry show metal-centred reduction processes for all of them. The reduction/oxidation potential values depend on the structures of complexes. Nickel complexes exhibit waves corresponding to Ni(III)-Ni(II) process. Electrochemical response of iron complexes depends on the presence of chloride ions. (C) 2000 Elsevier Science Ltd.

Synthesis, spectral and electrochemical properties of divalent metal complexes containing thiohydrazone and thiosemicarbazone ligands

The L1H4 and L2H6 complexes of metal halides MX2 (M = Cu, Ni, Co, Zn, Cd or Hg, X = Cl, Br or I) have been prepared. The complexes were characterized on the bases of 1H NMR, IR, electronic