Electrochemical and Spectroscopic Investigation of the Reduction of Dimethylglyoxime at Mercury Electrodes in the Presence of Cobalt and Nickel
作者:Lesley A. M. Baxter、Andrzej Bobrowski、Alan M. Bond、Graham A. Heath、Rowena L. Paul、Robert Mrzljak、Jerzy Zarebski
DOI:10.1021/ac9703616
日期:1998.4.1
adsorbed state: Co(II) + 2dmgH(2) right harpoon over left harpoon (solution) [Co(II)(dmgH)(2)] + 2H(+); [Co(II)(dmgH)(2)] + Hg right harpoon over left harpoon (electrode) [Co(II)(dmgH)(2)](ads)Hg; and [Co(II)(dmgH)(2)](ads)Hg + 10e(-) + 10H(+) --> Co(Hg) + 2[2,3-bis(hydroxylamino)butane]. The limited solubility of the nickel complex in aqueous media restricts the range of studies that can be undertaken
从含钴和镍的二甲基乙二肟(dmgH(2))溶液中获得的伏安图(极谱图)被广泛用于这些金属的痕量测定。在具有重要分析意义的氨缓冲液中,在滴落,悬挂和合并电极处观察到的还原过程的详细电化学和光谱研究均与整个10电子还原过程一致,其中dmgH(2)配体和钴离子在吸附状态下还原:Co(II)+ 2dmgH(2)右鱼叉超过左鱼叉(溶液)[Co(II)(dmgH)(2)] + 2H(+);[Co(II)(dmgH)(2)] + Hg右鱼叉在左鱼叉上(电极)[Co(II)(dmgH)(2)](ads)Hg; 和[Co(II)(dmgH)(2)](ads)Hg + 10e(-)+ 10H(+)-> Co(Hg)+ 2 [2,3-双(羟基氨基)丁烷]。镍络合物在水性介质中有限的溶解度限制了该系统可以进行的研究范围,但据信发生了类似的机理。在二氯甲烷中的冷冻悬空汞滴电极上进行低温伏安法研究,以及对二甲基乙二肟