• Title/Summary/Keyword: Inorganic chemistry

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Effect of pH and Temperature on the Electrochemical Reduction of Carbon Dioxide by Carbon Monoxide Dehydrogenase (일산화탄소탈수소화효소를 이용한 이산화탄소의 전기화학적 환원에 미치는 pH와 온도의 영향)

  • Shin, Jun-Won;Kim, You-Sung;Lee, Sang-Hee;Lee, Sang-Phil;Lee, Ho-Jun;Lim, Mi-Ran;Song, Ji-Eun;Shin, Woon-Sup
    • Journal of the Korean Electrochemical Society
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    • v.10 no.4
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    • pp.265-269
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    • 2007
  • The effects of experimental variables for the electrochemical reduction of carbon dioxide by Carbon Monoxide Dehydrogenase (CODH) were investigated. It shows the pH optimum at 6.3 where the feasibility of electro-chemical reduction and the stability of CODH compromise each other. The optimum temperature for the reduction was at $60^{\circ}C$ where the enzyme shows the optimum activity although the solubility of carbon dioxide decreases as increasing temperature.

Sandwich Intermediate Sitting-atop Complexation between Free Base meso-tetraarylporphyrins and Tellurium(IV) chloride

  • Dehghani, Hossein;Bakhshayesh, Sara;Shaterian, Maryam;Motamedi, Leila
    • Bulletin of the Korean Chemical Society
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    • v.31 no.4
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    • pp.815-818
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    • 2010
  • Free base meso-tetraarylporphyrins ($H_2T(X)PP$) react with tellurium(IV) chloride ($TeCl_4$) in mild conditions for formation sandwich intermediate sitting-atop (i-SAT) complexes, [$TeCl_4(H_2T(X)PP)_2$]. $^1H$ NMR, $^{13}C$ NMR, UV-vis, FT-IR and elemental analysis were used for characterization of the products. In the proposed structure of the i-SAT complexes, four pyrroles of each porphyrin ring are tilted alternatively up and down and this appropriates suitable orientation of lone pairs of two pyrrolenine nitrogens for electron donation to a tellurium center. $^1H$ NMR and FT-IR results showed that in the produced complex, hydrogen atoms of porphyrin macrocycles remained on the pyrrole nitrogens.

Cadmium Sulphide Nanorods: Synthesis, Characterization and their Photocatalytic Activity

  • Giribabu, Krishnamoorthy;Suresh, Ranganathan;Manigandan, Ramadoss;Vijayaraj, Arunachalam;Prabu, Raju;Narayanan, Vengidusamy
    • Bulletin of the Korean Chemical Society
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    • v.33 no.9
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    • pp.2910-2916
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    • 2012
  • Cadmium sulphide (CdS) nanorods were prepared by a single precursor thermal decomposition (SPTD) method. The formation of CdS nanorods and their structure, morphology and elemental composition were studied by means of FT-IR, XRD, FE-SEM, HR-TEM and EDAX analysis. Photoluminescence (PL) and lifetime measurements were recorded to study the luminescence properties of the material. The PL spectrum of the CdS nanorods showed one broad peak and four shoulders and the cause for this emission was discussed. The PL emissions from the band edge and deep trap state of the CdS nanorods were studied by lifetime measurements. Further, the synthesized CdS nanorods showed an increase in efficiency of photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB). The increase in the photocatalytic activity was attributed to the mixed phase of the CdS nanorods.

Poly(anthranilic acid) Microspheres: Synthesis, Characterization and their Electrocatalytic Properties

  • Ranganathan, Suresh;Raju, Prabu;Arunachalam, Vijayaraj;Krishnamoorty, Giribabu;Ramadoss, Manigandan;Arumainathan, Stephen;Vengidusamy, Narayanan
    • Bulletin of the Korean Chemical Society
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    • v.33 no.6
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    • pp.1919-1924
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    • 2012
  • Poly(anthranilic acid) was synthesized by rapid mixing method using 5-sulphosalicylic acid as a dopant. The synthesized polymer was characterized by various techniques like FT-IR, UV-Visible, and X-ray diffraction $etc.$, The FT-IR studies reveal that the 5-sulphosalicylic acid is well doped within the polymer. The morphological property was characterized by field emission scanning electron microscopic technique. The electrochemical properties of the polymer were studied by cyclic voltammetric method. The synthesized polymer was used to modify glassy carbon electrode (GCE) and the modified electrode was found to exhibit electrocatalytic activity for the oxidation of uric acid (UA).

Influences of Complexing Agents on the Formation of the Perpendicular Magnetic Film by the Electroless Plating (무전해 도금에 의한 수직자기 박막제조시의 착화제의 영향)

  • Kim, Yeong-U;Park, Jeong-Il;Park, Gwang-Ja;Kim, Jo-Ung;Ham, Yong-Muk;Lee, Ju-Seong
    • Journal of the Korean institute of surface engineering
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    • v.20 no.4
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    • pp.135-143
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    • 1987
  • Various complexing agents were investigated to see the effects on the normal orientation of HCP structure of Co-alloy to the film plane in ammoniacal electroless plating bath. To obtain the optimum condition, several complexing agents were investigated to compare the C-axis perpendicular orientation. Results were that succinate - citrate, malonate - succinate, malonate bath were useful for that purpose. Among these complexing agents, succinate - citrate system was obtained as the best one. X-ray diffraction patterns were used to compare the film properties with C-axis perpendicular orientation.

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