Kinetics and Mechanism of Formation of Monothiocyanato and Mononitrilotriacetato Complexes of Iron(III)
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概要
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Kinetics of the formation of monothiocyanato and mononitrilotriacetato complexes of iron(III) in aqueous solution have been studed by using a stopped-flow technique:<BR>Fe<SUP>3+</SUP>+SGN<SUP>−</SUP>\overset<I>k</I><SUB>1</SUB>\underset<I>k</I><SUB>−1</SUB>\rightleftharpoonsFeNCS<SUP>2+</SUP><BR>FeOH<SUP>2+</SUP>+SCN<SUP>−</SUP>\overset<I>k</I><SUB>2</SUB>\underset<I>k</I><SUB>−2</SUB>\rightleftharpoonsFeNCS<SUP>2+</SUP>+OH<SUP>−</SUP><BR>FeOH<SUP>2+</SUP>+H<SUB>2</SUB>nta<SUP>−</SUP>\overset<I>k</I>→Fe(nta)+H<SUP>+</SUP><BR>Rate constants at 25°C and μ=0.5 (NaClO<SUB>4</SUB>) are as follows: <I>k</I>=90 M<SUP>−1</SUP> sec<SUP>−1</SUP>, <I>k</I><SUB>−1</SUB>=1.6 sec<SUP>−1</SUP>, <I>k</I><SUB>2</SUB>=5.1×10<SUP>3</SUP>M<SUP>−1</SUP>sec<SUP>−1</SUP>, <I>k</I><SUB>−2</SUB>=10×10<SUP>13</SUP> M<SUP>−1</SUP> sec<SUP>−1</SUP>, <I>k</I>=1.0×10<SUP>5</SUP> M<SUP>−1</SUP> sec<SUP>−1</SUP>. Some discussions are made on the effect of hydroxide ion on the complex formation reactions.
- 公益社団法人 日本化学会の論文
著者
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Funahashi Shigenobu
Laboratory Of Analytical Chemistry Department Of Chemistry Faculty Of Science Nagoya University
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Tanaka Motoharu
Laboratory of Analytical Chemistry Faculty of Science Nagoya University
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Adachi Shoji
Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University
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