【摘要】 <正> 用三氯化锑的盐酸溶液电解制备高纯锑,国外曾有人报导过。我们也曾研究过这个方法,同时,注意到三氯化锑在不同浓度盐酸中的吸收光谱尚无系统测定资料,尤其是,其中的各种络离子的稳定常数等未见报导。H.M.Neuman等研究了锑(Ⅴ)在盐酸溶液中的紫外吸收光谱及其中络离子的品种与含量。为了进一步了解锑(Ⅲ)在盐酸溶液中的络离子的情况,本研究把试验分为两个部分:更多还原

【Abstract】 The ultra-violet absorption spectra of 6.894×10^-5M SbCl₃ in concentrated hydrochloric acid solution from 7.752 to 10.66M were measured. Owing to the hyperchromic effect and other reasons, the possibility of existence of SbCl₅⁼and Sbol₄^- species has been suggested. The stability constant of SbCl₅⁼ at 26℃ has been determinted to be K’stab.=（3.30±1.15）×10^-5 and the molar extinction coefficients of SbCl₄^- works out to be ∈_sbcl4^-=3.00×10³ at λ_max=230 nm. The ultra-violet absorption spectra of SbCl₃ in less concentrated hydrochloric acid solutions from 0.5-8Mwerealso measured. There is hypsochromic effect which offers the existence of hydroxo-chloro-complex ions. An attempt, according to H. M. Neumann, was made to decompose the observed spectra into the component parts and identify these components.. At 25℃ the equilibrium constants of the following reactions Sb（OH）Cl₃^-+H⁺+Cl^-SbCl₄^-+ H₂O and Sb （OH）₂ Cl^-+H⁺+Cl^-Sb（OH） Cl₃^-+H₂O—are 1.9x10^-2 and 0.414 respectively. The abundance of various specifies as a function of acidity is shown. It seems unlikely to offer coordination number of six for Sb（Ⅲ）, owing to lone-pair electron on Sb（Ⅲ）. However, it is quite likely to offer caordinated number of five. For brevity’s sake aqua ligands in the above complex ions were omitted from the formula.更多还原