Polarographic Studies of the Ion-pair Formation and Conjugation Reactions of Acetate and Benzoate Ions in Acetonitrile
Polarographic Studies of the Ion-pair Formation and Conjugation Reactions of Acetate and Benzoate Ions in Acetonitrile
复制标题
乙腈中乙酸根和苯甲酸根离子的离子对形成和共轭反应的极谱研究
DOI：
10.1246/bcsj.56.1963
复制
发表时间：
1983
期刊：
影响因子：
--
通讯作者：
Y. Imai
中科院分区：
文献类型：
--
作者：
M. Hojo;Y. Imai
醋酸离子（A−）与2分子醋酸（HA）在乙腈溶液中存在大量过量HA的情况下形成了同偶联物质A−(HA)2。在乙酸和LiClO4存在的情况下，通过锂离子从A−(HA)2中得到一个HA分子，从离子配对的HA2−Li中得到：A−(HA)2+Li+\oversetKex\ightleftharpoonsHA2−Li++HA。平衡常数Kex由醋酸离子的阳极半波电位的位移计算为1.1×104。苯甲酸离子（A ‘−）和HA ’也发生了类似的反应，交换反应常数为6×103。钠离子和HA（或HA ‘）对A -（或A ’ -）离子的影响是复杂的。另一方面，通过碱金属阴极波的位移证明了[M(A ')2]−（M=Li, Na， K）的存在。水的加入使[Li（A’）2]−的表观稳定常数大大降低。
An acetate ion (A−) formed a homoconjugated species, A− (HA)2, with 2 molecules of acetic acid (HA) in the presence of a large excess of HA in an acetonitrile solution. In the presence of both acetic acid and LiClO4, one molecule of HA was derived from A− (HA)2 by means of a lithium ion to from an ion-paired species, HA2−Li, as follows: A−(HA)2+Li+\oversetKex\ightleftharpoonsHA2−Li++HA. The equilibrium constant, Kex, was evaluated as 1.1×104 from the shift in the anodic half-wave potential of the acetate ion. As for the benzoate ion (A′−) and HA′, similar reactions occured, and the constant of the exchange reaction was evaluated as 6×103. The effect of the sodium ion and HA (or HA′) on the A− (or A′−) ion was complicated. On the other hand, the presence of [M(A′)2]− (M=Li, Na, K) was proved by the shift of the cathodic wave of the alkali metal.The addition of water caused the apparent stability constant of [Li(A′)2]− to decrease extremely.