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Thermal stability and electrochemical behaviour of Tetrakis-μ-benzoatodicopper(II)

100%

Mohamadin M., Abdullah N.

Open Chemistry

2010

vol. 8

issue 5

1090-1096

Copper(II) benzoate (CuB) was synthesized and structurally characterized to have a binuclear, paddle-wheel structure. The complex was found to be thermally stable up to 230°C, and underwent four stages of decomposition, loss of CO2, C6H6, CH3CH2-OCH2CH3 and some aliphatic unsaturated organic materials. The DSC curve shows two endotherms at 80.0°C and 230.0°C respectively, indicating that the initial weight loss can be attributed to solvated molecules and the starting of the major decomposition process, (shown in the TG analysis). Cyclic voltammetry studies in a mixed-solvent system of methanol and ethanoic acid (20:1 v/v) show three cathodic peaks, at −0.13 V, −0.35 V and −0.74 V, representing a step-wise electron transfer process, and two overlapping anodic peaks at +0.31 V and +0.46 V. The high value of ΔE ranging from 400 mV to 1200 mV indicates that the redox process is accompanied by an extensive structural reorganization of the complex in the solution creating a different geometrical environment around the central copper ion. [...]

Electrochemical study and MO - modeling of the reduction behaviour of some arylidene substituted derivatives of dibenz [b,e]-thiepin-5,5-dioxide-11-one

88%

Preda L., Volanschi E.

Open Chemistry

2009

vol. 7

issue 3

486-493

The electrochemical reduction of four arylidene substituted derivatives of dibenz-[b,e]-thiepin-5,5-dioxide-11- one has been studied by cyclic voltammetry on platinum (Pt) electrode in aprotic media (DMSO), coupled with spectral EPR techniques. From the analysis of cyclic voltammetry experiments, aided by digital simulations using DigiSim software, the kinetic and thermodynamic parameters were evaluated for each system. The electrochemical behaviour is strongly directed by the nature of the arylidene substituents bound to the central heterocycle. The electrochemical investigation and solvent dependent semiempirical modeling using the PM3 hamiltonian in the frame of AMPAC program package allowed a rationalisation of experimental data regarding the electrochemical reduction and the reactivity of the intermediate species involved. [...]

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2 Open Chemistry

1 2010

1 2009

1 Abdullah N.

1 Mohamadin M.

1 Preda L.

1 Volanschi E.

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Thermal stability and electrochemical behaviour of Tetrakis-μ-benzoatodicopper(II)

Electrochemical study and MO - modeling of the reduction behaviour of some arylidene substituted derivatives of dibenz [b,e]-thiepin-5,5-dioxide-11-one