【摘要】 研究了酸性水溶液中硫氰酸钼配合物（Ⅴ）的吸收光谱,发现在460nm处有最大吸收,最大平均摩尔吸光系数为1.02×10⁴。用平衡移动法确定其生成机理为一种三级分级配合反应,并用法确定了各级配合物的稳定常数分别为β₁=15.63,β₂=174.4和β₃=1502,相应的摩尔吸光系数是△ε₁=8957,△ε₂=9347和△ε₃=10610。更多还原

【Abstract】 In this paper, the Mo( V )-thiocyanate complexing reaction in the acidic aqueous solution without surfactant or organic solvent was studied. It was found that the Mo( V )-thiocyanate complexes could be stable for 4 h at least in the 50 mL solution containing 7.5mLH2SO4 (1:1), 4 mL HC1O4, (1:1), 3 mg Fe2+ and 4 mL vitamin C (6%). The absorption spectrum of Mo( V )-thiocya-nate complexes under this condition was studied, a peak of 460 nm was found and the maximal mokr absorption coefficient was determined to be 1.02 × 104. The reaction mechanism of the Mo( V )-thiocyanate complexes was determined to be a three-grade complexing reaction by using the equilibrium movement method. Meanwhile, the stable constants of all kinds of grades complexes was determined by the method to be β1 = 15.63, β2 = 174.4 and β3 = 1 502 , and the corresponding molar absorption coefficients were △ω1, = 8 957, △ω2 = 9 347 and △ω3 = 10 610 , respectively.更多还原