硫氰酸铋(Ⅲ)配合物UV光区摩尔吸光系数的研究

Study on the Molar Absorption Coefficients of Bi(Ⅲ) Thiocyanate Complexes in UV Spectrum

本文研究了吐温－８０水溶液中硫氰酸铋（Ⅲ）配合物的吸收光谱，最大吸收波长λｍａｘ＝３３５ｎｍ，其摩尔吸光系数ε３３５＝２．６１×１０４，与ＰＡＲ、偶氮胂（Ⅲ）与铋（Ⅲ）的配合物的ε６１０＝２．７０×１０４相近。发现形成一种新的三元配合物，并用来解释在吐温－８０水溶液中硫氰酸铋为一种灵敏的显色反应。

The absorption spectra of bismuth(Ⅱ) thiocyanate in the Tween 80 H 2O solution were studied in this paper,in which the maximum wavelength λ max =335 nm and the molar extinction coefficient ε 335 =2 61×10 4, similar to those of complexes of bismuth with PAR or azoarsenic(Ⅲ), ε 610 =2 70×10 4 .A new tribasic complex was found and used to explain that bismuth(Ⅲ) thiocyanate is a sensitive colour reaction in the Tween 80 H 2O solution.