NOPR Collection:

Electrochemical properties of macromolecular bound Ruthenium(II) complexes coated electrodes

Wed, 01 Mar 1989 00:00:00 GMT

Title: Electrochemical properties of macromolecular bound Ruthenium(II) complexes coated electrodes Authors: Ramaraj, R; Natarajan, P Abstract: Cyclic voltammetric behaviour of electrodes coated with macromolecular bound ruthenium complexes has been investigated. Bis(bipyridine)-dichlororuthenium(II) has been condensed with poly(4-vinylpyridine) and its copolymers with methylolacrylamide. Macromolecular ruthenium complexes containing covalently bound thionine dye have been prepared and their electrochemical behaviour has been investigated. Number of ruthenium complex centres bound to the macromolecular chain has been varied and the redox behaviour of the metal complex in the presence of macromolecular chain has been studied. Page(s): 187-196

Liquid Junction Potentials Across Aqueous Saturated Calomel Electrode/Some Aquo-organic Solvents Interface

Wed, 01 Mar 1989 00:00:00 GMT

Title: Liquid Junction Potentials Across Aqueous Saturated Calomel Electrode/Some Aquo-organic Solvents Interface Authors: Datta, Jayati; Sinha, Subrata; Kundu, Kiron K Abstract: The liquid junction potentials (E_j) generated at the boundaries of saturated KCI solution of aqueous saturated calomel electrode [SCE (W)] and mixed aqueous organic solvents have been determined within the framework of tetraphenylarsonium tetraphenylboride (TATB) reference electrolyte extra-thermodynamic assumption. The organic solvents comprise protic methanol (MeOH) and ethanol (EtOH), aprotic dioxane (D) and dipolar aprotic acetonitriJe (ACN), N,N-dimethylformamide (DMF) and dimethyl sulphoxide (DMSO). The E_j values increase almost monotonically in the cases of DMF and DMSO and remain almost invariant till 50 wt % MeOH and EtOH, while in ACN and D, the values lie in between. The contribution to E_j values is mainly from difference of ion-solvent interactions in these mixed solvents, which becomes significant only in the organic-rich compositions. Page(s): 197-201

Electrochemical Oxidation of Sulphathiazole at Pyrolytic Graphite Electrode

Wed, 01 Feb 1989 00:00:00 GMT

Title: Electrochemical Oxidation of Sulphathiazole at Pyrolytic Graphite Electrode Authors: Goyal, R N; Kumar, Anoop; Mittal, Alok Abstract: The electrochemical oxidation of sulphathiazole has been studied in the pH range of 1.2-10.7 at pyrolytic graphite electrode. Two well-defined pH dependent peaks are observed. The various products isolated and the observed voltamrnetric, coulometric and spectral results have been rationalised. One of the products obtained from electrooxidation is an azo compound. Page(s): 202-205

Kinetics & Mechanism of Solid State Reaction between o-Phenylenediamine & p-Benzoquinone

Wed, 01 Mar 1989 00:00:00 GMT

Title: Kinetics & Mechanism of Solid State Reaction between o-Phenylenediamine & p-Benzoquinone Authors: Singh, N B; Singh, R J Abstract: o-Phenylenediamine (oPDA) reacts with p-benzoquinone (BO) in the solid state forming the complex oPDA₂^.BQ₁, which is dark brown in colour. ESR spectrum of the complex confirms the presence of free radical in oPDA₂^.BQ₁. Spectroscopic studies (IR, UV) indicate that charge transfer interaction stabilised by H-bonding is involved in the formation of the complex. During the course of solid state reaction, BQ molecules diffuse in oPDA through surface migration and the reaction goes to completion by the penetration of BO molecules into the crystal lattice of oPDA. Electrical conductivity measurement of solid oPDA₂^.BQ₁, below 575 K shows that the complex behaves as a semiconductor, with a energy band gap of 3.00 eV. Page(s): 206-210