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Bulletin of the College of Science, University of the Ryukyus >
No.80 (2005/9) >
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| Title | : | MECHANISM OF CHARACTERISTIC DECOMPOSITION OF Cu(PCD)_2 EXTRACTED FROM HYDROCHLORIC ACID: CONTRIBUTION OF REACTION BETWEEN Cu(PCD)_2 AND CuClx^(2-x) |
| Authors | : | Murakami, Masahiko
Takada, Takeo
Kuniyoshi, Masayuki |
| Authors alternative | : | 国吉, 正之 |
| Issue Date | : | Sep-2005 |
| Abstract | : | To study the decomposition mechanism of copper(2) pyrrolidinecarbodithioato chelate (Cu(PCD)_2) extracted into di-isobutylketone (DIBK) with 1-pyrrolidinecarbodithioate (APCD) from 0,01～8 M hydrochloric acid solution, the effect of the ligand concentration in organic phase on the decomposition of Cu(PCD)_2 has been studied. The concentration of the free ligand in the extract decreases with time; this decrease obeys good first-order kinetics, and depends on the acidity. On the other hand, the concentration of Cu(PCD)_2 is not seemingly altered as long as the free ligand is present in the extract; however, the copper chelate begins to react with hydrochloric acid as soon as the free reagent has run out due to its decomposition. Furthermore, the reaction of Cu(PCD)_2 with hydrochloric acid in IBMK solution has also been studied kinetically. To monitor the reaction, the molar absorption coefficients of some species [CuCl(PCD), CuCl_2, and CuCl^-_3], which are formed in the course of this reaction, at 350 - 500 nm are determined. It can be thought that the reaction consists of not only simple ligand substitution by Cl^- but also of the path which gives CuCl(PCD) by reaction between Cu(PCD)_2 and CuCl_2,, and the path can be regard as the practical motive force of the decomposition of Cu(PCD)_2 extracted from hydrochloric acid solution. |
| Type Local | : | 紀要論文 |
| ISSN | : | 0286-9640 |
| Publisher | : | 琉球大学理学部 |
| URI | : | http://hdl.handle.net/20.500.12000/5376 |
| Citation | : | 琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus no.80 p.45 -61 |
| Appears in Collections | : | No.80 (2005/9)
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