• Title/Summary/Keyword: copper complexes

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Inhibition of Pitting Corrosion Failure of Copper Tubes in Wet Sprinkler Systems (스프링클러 구리배관의 공식 파손 억제)

  • Suh, Sang Hee;Suh, Youngjoon;Lee, Jonghyuk;Kwon, HyukSang
    • Corrosion Science and Technology
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    • v.19 no.2
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    • pp.89-99
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    • 2020

  • The inhibition of pitting corrosion failure of copper sprinkler tubes in wet sprinkler systems was studied. First, an apparatus and technology for removing air in the sprinkler tubes by vacuum pumping and then filling the tubes with water were developed. Using this apparatus and technology, three methods for inhibiting the pitting corrosion of the copper sprinkler tubes installed in several apartment complexes were tested. The first one was filling the sprinkler tubes with water bubbled by high-pressure nitrogen gas to reduce the dissolved oxygen concentration to lower than 2 ppm. In the second method, the dissolved oxygen concentration of water was further reduced to lower than 0.01 ppm by sodium sulfite. In the third method, the sprinkler tubes were filled with benzotriazole (BTAH) dissolved in water. The third method was the most effective, reducing the failure frequency of the sprinkler tubes due to pitting corrosion by more than 80%. X-ray photoelectron spectroscopy analyses confirmed that a Cu-BTA layer was well coated on the inside surface of the corrosion pit, protecting it from corrosion. A potentiodynamic polarization test showed that BTAH should be very effective in reducing the corrosion rate of copper in the acidic environment of the corrosion pit.

  • https://doi.org/10.14773/cst.2020.19.2.89 인용 PDF KSCI

Hydrothermal Synthesis, Crystal Structures and Properties of Zinc(II) Di-nuclear Complex and Copper(I) Coordination Polymer Based on Building Block 2-Phenyl-4,6-di(pyridin-2-yl)pyrimidine

  • Zhao, Pusu;Jing, Wang;Jing, Long;Jian, Fangfang;Li, Yufeng
    • Bulletin of the Korean Chemical Society
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    • v.34 no.12
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    • pp.3743-3748
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    • 2013

  • A tetradentate ligand of 2-phenyl-4,6-di(pyridin-2-yl)pyrimidine (L) has been synthesized and its complexes with $ZnI_2$ and CuI have been obtained by hydrothermal method. single crystal X-ray diffraction analysis indicates that ligand L coordinates with Zn(II) ions to form a simple four-coordinate di-nuclear complex, while the complexation of L with Cu(I) constructs a one-dimensional chain polymer. The existence of $I^-$ ion hampers the L to assemble grid-type complexes with Zn(II) and Cu(I). Fluorescence spectra show that the L emits blue fluorescence while its Cu(I) polymer decrease the fluorescence intensity and Zn(II) complex quenches the fluorescence.

  • https://doi.org/10.5012/bkcs.2013.34.12.3743 인용 PDF KSCI KPUBS HTML

Electrocatalysis of Oxygen Reduction by Cu-containing Polymer Films on Glassy Carbon Electrodes

  • Kim, Jong-Won;Gewirth, Andrew A.
    • Bulletin of the Korean Chemical Society
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    • v.28 no.8
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    • pp.1322-1328
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    • 2007

  • The catalytic activity of poly[(2,2'-bipyridine)copper(II)-μ4-oxalato] coated on a glassy carbon electrode (GCE) for O2 electroreduction is examined using cyclic voltammetry and rotating disk electrode techniques. The cyclic voltammograms show that O2 is electroreduced on pBpCuOx-coated GCE surfaces at a peak potential of ? 0.25 V in pH 4.7 acetate buffer media. The electroreduction of O2 on pBpCuOx-coated GCE occurs at 450 mV more positive potential than that found at a bare GCE. The catalytic activity originates from Cu(II) coordinated by bipyridine in the complexes and the polymer type Cu-complex films exhibit an enhanced stability compared to monomeric Cu-complexes during the O2 electroreduction. The rotating disk electrode measurements reveal that the electroreduction of O2 on pBpCuOx-coated GCE is a four-electron process. Kinetic parameters for O2 reduction on pBpCuOx-coated GCE are obtained from rotating disk experiments and compared with those on bare glassy carbon electrode surfaces.

  • https://doi.org/10.5012/bkcs.2007.28.8.1322 인용 PDF KSCI

Sythesis and Characterization of Transition Metal(II) Complexes with $NOTDH_2$ Schiff Base ($NOTDH_2$ Schiff Base를 가진 전이금속(II) 착물의 합성과 구조분석)

  • Oh, Jeong-Geun;Choi, Yong-Kook
    • Analytical Science and Technology
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    • v.12 no.6
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    • pp.498-503
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    • 1999

  • Co(II), Ni(II), and Cu(II) complexes with tetradentate schiff base-$NOTDH_2$, were synthesized. The structures of these complexes were characterized by elemental analysis, IR, UV-visible, NMR spectra, and thermogravimetric analysis. The mole ratio of schiff base($NOTDH_2$) to the metal(II) at complexes was found to be 1:1. Cu(II) complexes were four-coordinated configuration, while Co(II) and Ni(II) complexes were hexacoordinated configuration containing two water molecules and all complexes were non-ionic compounds.

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