• Title/Summary/Keyword: copper complex

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Electrochemical Behaviors of Copper-1-(2-Thiazolylazo)-2-naphthol Complex in Acetonitrile (아세토니트릴 용매 중에서 Copper-1-(2-Thiazolylazo)-2-naphthol 착물의 전기화학적 거동)

  • Bae Zun Ung;Lee Heung Lark;Park Tae Myung;Seo Moo Lyong
    • Journal of the Korean Chemical Society
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    • v.35 no.4
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    • pp.405-409
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    • 1991

  • The electrochemical behaviors of copper-1-(2-thiazolylazo)-2-naphthol [Cu(II)-TAN] complex in acetonitrile (AN) solution have been investigated by the use of polarography, controlled potential coulometry and UV-Vis spectroscopy. Cu(II)-TAN complex exhibit three reduction waves at -0.91 V, -1.34 V and -1.65 V vs. S.C.E. in acetonitrile solution containing 5.0 ${\times}\;10^{-3}$M tetraethylammonium perchlorate. Every reduction wave is diffusion controlled. The first reduction wave is considerably reversible and this process is attributed to the formation of anion radical. The second reduction process to the dianion is followed by a chemical reaction producing a complex of hydrazo complex. The third reduction process produce Cu(Hg) amalgam and amine compound.

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Template Synthesis, Crystal Structure, and Magnetic Properties of a Dinuclear Copper(II) Complex with Cooperative Hydrogen Bonding

  • Kang, Shin-Geol;Nam, Kwang-Hee;Min, Kil-Sik;Lee, Uk
    • Bulletin of the Korean Chemical Society
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    • v.32 no.3
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    • pp.1037-1040
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    • 2011

  • The dinuclear complex 1 with cooperative hydrogen bonds can be prepared by the metal-directed reaction of Eq. (2). This work shows that the coordinated hydroxyl group trans to the secondary amino group is deprotonated more readily than that trans to the tertiary amino group and acts as the hydrogen-bond accepter. The lattice water molecules in 1 act as bridges between the two mononuclear units through hydrogen bonds. The complex is quite stable as the dimeric form even in various polar solvents. The complex exhibits a weak antiferromagnetic interaction between the metal ions in spite of relatively long Cu$\cdots$Cu distance. This strongly supports the suggestion that the antiferromagnetic behavior is closely related to the cooperative hydrogen bonds.

  • https://doi.org/10.5012/bkcs.2011.32.3.1037 인용 PDF KSCI

Complexing Capacity - A Measure of Evaluating Water Quality

  • Akaiwa, Hideo;Itabashi, Hideyuki
    • Analytical Science and Technology
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    • v.8 no.4
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    • pp.1089-1094
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    • 1995

  • Methods for the measurement of copper(II) complexing capacity (CuCC) of natural waters by using the back-extraction of bis(benzoyl-trifluoroacetonate)copper(II) and the extraction rate of dithizonato-copper(II) complex were described. Experimental results show that the CuCC of the Kiryu river water samples from urban area were consistently larger than those from up-stream, due to a ligand which originated from human activities.

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Electrochemical Behavior of Zn(II)-Bilirubin Complex in N,N-Dimethylformamide (N,N-Dimethylformamide 용액 중에서 Zn(II)-Bilirubin 착물의 전기화학적 거동)

  • Zun-Ung Bae;Heung-Lark Lee;Tae-Myung Park;Moo-Lyong Seo
    • Journal of the Korean Chemical Society
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    • v.37 no.7
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    • pp.672-676
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    • 1993

  • The complexation of bilirubin with zinc(II) and copper(II) ions was studied spectrophotometrically. In the zinc(II)-bilirubin (Zn-BR) system, complex is formed, but the copper(II) ion oxidizes bilirubin to biliverdin and then to the further oxidation products. The electrochemical reduction behavior of ZN-BR complex has been investigated with DC polarography and cyclic voltammetry. The three polarographic waves were obtained for the reduction of ZN-BR complex in DMF solution. Thde reduction current of the third wave was diffusion current, but that of the first and the second waves contained a little kinetic current.

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Transfer of Cupric Sulfate across Rat Small Intestine, in Vitro and Effect of Chelating Agents on It's Transfer

  • Kim, Chong-Kil;Choi, Seung-Gi;Rho, Young-Soo
    • Archives of Pharmacal Research
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    • v.11 no.2
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    • pp.81-86
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    • 1988

  • The transfer of cupric sulfate across the rat small intestine in vitro was studied by perfusion method using the segments of everted rat small intestine. Copper transport was approximately propotional to the metal concentration in the mucosal solution and no difference was observed in the metal transport among rat duodenum, jejunum and ileum. It was suggested from these results that copper transport across the rat small intestine would occur by passive diffusion. The effect of various chelating agents on copper transport across the rat small intestine n vitro and its uptake by the intestine were also studied. Copper transport was greatly enhanced in the presence of EDTA and NTA. Copper uptake decreased to a greater extent in the presence of EPTA and NTA.

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