- 作者: 于淑君; 董慧展; 葉玉堂
- 作者服務機構: Department of Chemistry, Chun-Yuan Christian University, Chung-Li, Taiwan, R.O.C.
- 中文摘要: The rate for the substitution reaction of Co(edta)/sup -/ with ethylenediamine was greatly enhanced by the presence of an excess of Co(II) ion in solution. The rate constant is (13.plmin.2) M/sup -1/-sec/sup -1/ at .mu.=0.10M LiClO/sub 4/, pH=11.1, [en]=0.10M and T=25.degree.C. The mechanism for the reaction is discussed on the basis of the Marcus theory for outer-sphere processes corrected for electrostatic effects. This catalytic effect was not observed when the Co(II) was present in small amount due to the stability of the Co(edta)/sup -2/ complex toward substitution. The rate constant for direct substitution of Co(edta)/sup -/ under the same conditions has also been measured and the value is (3.66.plmin.0.40)*10/sup -4/sec/sub -1/.
- 英文摘要: --
- 中文關鍵字: Co(edta)/sup -/ and Co(en)/sub 3//sup 3+/ complexes; stoichiometry; pseudo-first-order rate constant.
- 英文關鍵字: Co(edta)/sup -/ and Co(en)/sub 3//sup 3+/ complexes; stoichiometry; pseudo-first-order rate constant.