陰イオン選択性電極感応膜中における複核ジアルキルスズ(IV)錯体の生成によるα-ヒドロキシカルボン酸選択性(<特集>若手研究者の初論文)

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The liquid-membrane ion-selective electrode based on bis(pentafluorobenzyl) tin(IV) dibromide showed higher selectivities to a-hydroxycarboxylates than to other carboxylates without any hydroxyl group and those with a β-hydroxy group. The calibration curve for citrate was linear overarange of 10^<-4> to 10^<-2> mol dm^<-3> with a potential slope of -60mV/decade. The equilibrium study on the complexation between dimethyltin(IV) and a series of carboxylates indicates the formation of stable, neutral and dimeric complexes only with α-hydroxycarboxylates, [(Me_2Sn)_2(H_<-1>hc)_2] {(H_<-1>hc)^<-2> : species formed by deprotonation of α-hydroxycarboxylates (he^-) at α-OH groups}. The corresponding species may be spontaneously formed as electroactive species in the liquid membrane containing bis(pentafluorobenzyl)tin(IV) dibromide and acquire the selectivity to α-hydroxycarboxylates.
社団法人日本分析化学会の論文
2008-08-05