Pulse radiolytic studies of aqueous manganese(II) perchlorate solutions

Pulse radiolytic studies of aqueous manganese(II) perchlorate solutions
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高氯酸锰 (II) 水溶液的脉冲辐射分解研究

DOI:
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发表时间:
1976
期刊:
影响因子:
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通讯作者:
J. Rabani
J. Rabani
中科院分区:
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文献类型:
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作者:
M. Pick;J. Rabani

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以Mn(ClO/sub - 4/)/sub - 2/为原料,研究了Mn/sup 2 +/与CO/sub - 2//sup -/、e/sup -//sub - aq/、OH和O/sub - 2//sup -/的反应。测定了反应速率常数:k(Mn/sup 2 +/ + CO/sub 2//sup -/)小于2 × 10/sup 5/ M/sup -1/ s/sup -1/;k(Mn/sup 2 +/ + e/sup -//sub aq/) = (9 +- 2) × 10/sup 6/ M/sup -1/ s/sup -1/(离子强度0.15 ~ 0.5 M);k (Mn /一口2 + / +哦)= (3.4 + - 0.8 x 10 /一口7 / M / 1 / s /共舞,吃晚饭1 /;k (Mn /一口2 + 2 / + O /子/ / 10)= (1.1 + - 0.2 x 10 /一口8 / M / 1 / s /共舞,吃晚饭1 /甲酸(0.01米)。O/ sub2 //sup -/自由基离子与Mn/sup 2 +/反应生成Mn/sup 3 +/或MnO/ sub2 //sup +/离子。发现该反应是可逆的,在pH为6.7时测得平衡常数K = (1.5 +- 0.6) × 10/sup 4/ M/sup -1/。而Mn/sup 2 +/不催化O/sub 2//sup -/的畸变。报道了锰(III)的歧化(MnOH/sup 2 +/)和随后的产物MnO/ sup 2/成核。
Using Mn(ClO/sub 4/)/sub 2/, the reactions of Mn/sup 2 +/ with CO/sub 2//sup -/, e/sup -//sub aq/, OH, and O/sub 2//sup -/ were studied at pH 6.7. The following reaction rate constants were measured: k(Mn/sup 2 +/ + CO/sub 2//sup -/) less than 2 x 10/sup 5/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + e/sup -//sub aq/) = (9 +- 2) x 10/sup 6/ M/sup -1/ s/sup -1/ (ionic strength 0.15 to 0.5 M); k(Mn/sup 2 +/ + OH) = (3.4 +- 0.8) x 10/sup 7/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + O/sub 2//sup -/) = (1.1 +- 0.2) x 10/sup 8/ M/sup -1/ s/sup -1/ (0.01 M formate). O/sub 2//sup -/ radical ions react with Mn/sup 2 +/ and produce Mn/sup 3 +/ or MnO/sub 2//sup +/ ions. The reaction was found to be reversible, and an equilibrium constant K = (1.5 +- 0.6) x 10/sup 4/ M/sup -1/ was measured at pH 6.7. Mn/sup 2 +/, however, does not catalyze the dismutation of O/sub 2//sup -/. The disproportionation of Mn(III) (as MnOH/sup 2 +/) and the subsequent nucleation of the product MnO/sub 2/ are reported.