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保持 I 中之乙二胺三乙酸的结构,而在其分子中引入硫醚基团,合成一系列 N-(β-烷基硫代乙基)-N,N′,N′-乙二胺三乙酸(VIa—d),希望能得到较 I 为强的螯合剂,并制备出其相应的锑盐。由观察所得锑盐的化学性质及其极谱研究,以及由于β-巯基乙胺三乙酸(Ⅶ)不能与锑生成稳定的螯合物等事实,说明硫醚键与锑原子间并不能形成强度与氮原子和锑原子间相当的配价键,因而初步假定(IVa—d)与锑螯合时仍为五配价的螯合剂。由研究结果,其锑螯合物的稳定性是按以下次序:(VId)>(VIc)>(VIb)>(VIa)
The structure of ethylenediaminetriacetic acid in I was maintained while the thioether groups were introduced into the molecule to synthesize a series of N- (β-alkylthioethyl) -N, N ’, N’-ethylenediamine Triacetic acid (VIa-d), hoping to get stronger than the I chelator, and prepare the corresponding antimony salt. From the observation of the chemical properties of the antimony salt and its polarographic studies, as well as the fact that β-mercaptoethylamine triacetic acid (VII) can not form a stable chelate with antimony, etc., it shows that the strength between the thioether bond and the antimony atom can not be formed And the nitrogen and antimony atoms equivalent valence bond, and thus presumably (IVa-d) and antimony chelation is still five valence chelating agent. From the results of the study, the stability of its antimony chelate is in the following order: (VId)> (VIc)> (VIb)> (VIa)