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1
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A novel redox-active calix[4]arene-tetrathiafulvalene dyad

100%
Zhao B.-T., Zhu X.-M., Peng Q.-M., Yan Z.-N., Derf F., Sallé M.
Open Chemistry
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2011
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vol. 9
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issue 6
1102-1108
EN
A novel redox-active calix[4]arene-TTF 5 was prepared by the reaction of p-tert-butylcalix[4]arene 4 with the tosylated TTF 3 in the presence of cesium fluoride. The structure of the dyad 5 was identified by X-ray diffraction analysis, and the preliminary electrochemical properties of 5 were investigated by cyclic voltammetry (CV), for which two reversible one-electron waves were observed. Moreover, the UV-vis absorption spectra studies show that the dyad 5 undergoes progressive oxidation at the TTF moiety in presence of increasing amounts of Cu2+ or Hg2+. [...]
2
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Electrochemical behavior of some purine derivatives on carbon based electrodes

100%
Câmpean A., Tertiş M., Săndulescu R.
Open Chemistry
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2011
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vol. 9
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issue 3
466-473
EN
The electrochemical behaviour of three purine derivatives was investigated by cyclic voltammetry on different electrode materials: glassy carbon in native form and electrochemically activated, carbon paste electrode unmodified or modified with 1, 4-benzoquinone. The preliminary study obtained on solid electrodes was extended to graphite based planar screen-printed electrodes, unmodified and modified with multi-wall carbon nanotubes, or cobalt phthalocyanine. The influence of some experimental parameters (pH, scan rate, concentration and electrolytic medium) on the electrochemical behaviour of these alkaloids was also examined. The electrochemical oxidation of purine derivatives is an irreversible and diffusion controlled process, proved by the linear dependence between the peak potentials and the logarithm of scan rates and between the anodic peak current and the square root of scan rate.
3
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Kinetics of electrode reaction coupled to ion transfer across the liquid/liquid interface

88%
Komorsky-Lovrić Š., Lovrić M.
Open Chemistry
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2005
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vol. 3
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issue 2
216-229
EN
In the theoretical model it is assumed that a graphite disk electrode is covered by a thin film of solution of decamethylferrocene (dmfc) and some electrolyte CX in nitrobenzene and immersed in an aqueous solution of the electrolyte MX. Oxidation of dmfc is accompanied by the transfer of anion X − from water into nitrobenzene since it is also assumed that cations dmfc + and C + are insoluble in water and cation M + is insoluble in nitrobenzene. Kinetic parameters of the electrode reaction can be determined if the total potential difference across the nitrobenzene/water interface is maintained constant by adding the electrolytes CX and MX in concentrations which are much higher than the initial concentration of dmfc in nitrobenzene.
4
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Synthesis, characterization, catalytic and antimicrobial studies of ruthenium(III) complexes

88%
Thilagavathi N., Jayabalakrishnan C.
Open Chemistry
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2010
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vol. 8
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issue 4
842-851
EN
Ru(III) complexes of the type [RuXB(L)2] have been prepared by the reaction of 3,4-dihydropyrimidin-2(1H)-ones/thiones (HL1–HL4) with the precursors of the type [RuX3B3] where X=Cl or Br; B=PPh3 or AsPh3 and L is the deprotonated ligand. The synthesized complexes were characterized by physico-chemical methods, electrochemical and magnetic moment data. The catalytic efficiency of the complexes were examined in the oxidation of alcohols and antimicrobial studies were also carried out. [...]
5
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Removal of hazardous pharmaceutical from water by photocatalytic treatment

88%
Choina J., Duwensee H., Flechsig G., Kosslick H., Morawski A., Tuan V., Schulz A.
Open Chemistry
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2010
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vol. 8
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issue 6
1288-1297
EN
The photocatalytic abatement of hazardous pharmaceuticals has been investigated at very low concentration in the ppb range as found in wastewater and in environmental pollutants. Photocatalytic degradation of tetracycline as a model compound with titania catalysts has been studied using solarium UV-A and black light with differentially applied electric power, tetracycline and catalyst concentration. Abatement of up to 90% has been achieved after 1 hour. Adsorption of tetracycline and photochemical degradation contribute significantly to the abatement of tetracycline resulting in an immediate reduction during the initial period of treatment. Contribution of adsorption is high at very low concentration (500 ppb). Photocatalytic treatment with titania is even highly efficient in the abatement of very small concentrations of tetracycline in drinking water.
6
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Interfacial transfer of Cd2+ assisted by 4′ - morpholino-acetophenone-4-phenyl-3-thiosemicarbazone across the water/1,2-dichloroethane interface

88%
Bingol H., Atalay T.
Open Chemistry
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2010
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vol. 8
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issue 5
1134-1139
EN
The assisted transfer of heavy metal ions by interfacial complexation with 4′-morpholinoacetophenone-4-phenyl-3-thiosemicarbazone (MAPPT) at the interface between two immiscible electrolyte solutions (ITIES) was studied by cyclic voltammetry. The voltammograms obtained across the water/1,2-dichloroethane interface using the MAPPT ligand in the organic phase shows that the assisted metal ion transfers have different nature for different ions. The quasi-reversible voltammetric peak of the Cd2+ ion was obtained and is discussed in detail. The dependence of the half-wave transfer potential on MAPPT concentration showed that the equilibrium is effectively displaced towards a 1:3 (metal:ligand) stoichiometry with an association constant of log β o =15.46 (±0.11) for the Cd2+ ion, corresponding to the TIC/TID mechanism. [...]
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