Bettinardi David J, Paulenova Alena, Tkac Peter
School of Nuclear Science & Engineering, Oregon State University, 100 Radiation Center, Corvallis, Oregon 97330, United States.
Chemical and Fuel Cycle Technologies Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States.
ACS Omega. 2020 Sep 9;5(37):23786-23792. doi: 10.1021/acsomega.0c02858. eCollection 2020 Sep 22.
Speciation of Mo(VI) in chloride media (0.5-11 M HCl) at elevated Mo concentrations (0.1-300 mM Mo) was investigated using UV spectroscopy. In addition to five major monomeric species, HMoO, HMoO , HMoOCl, MoOCl, and MoOCl , chemometric analysis of UV spectra suggests the presence of three cationic dinuclear species that predominate in solutions of 1-4.5 M HCl at >20 mM Mo concentrations. Thermodynamic values and molar absorptivity spectra were calculated from UV spectrophotometric data using refined numerical methods. The stability constants determined for three Mo dimers are log β = 3.53 ± 0.05 (HMoO ), log β = 3.60 ± 0.04 (HMoO ), and log β = 2.91 ± 0.03 (HMoOCl).
利用紫外光谱研究了在高钼浓度（0.1 - 300 mM钼）下，氯化物介质（0.5 - 11 M HCl）中钼（VI）的形态。除了五种主要的单体物种HMoO₄⁻、H₂MoO₄⁻、HMoO₃Cl²⁻、MoO₃Cl³⁻和MoO₂Cl₄²⁻外，紫外光谱的化学计量分析表明存在三种阳离子双核物种，它们在钼浓度>20 mM、1 - 4.5 M HCl的溶液中占主导地位。使用改进的数值方法从紫外分光光度数据计算出热力学值和摩尔吸光率光谱。确定的三种钼二聚体的稳定常数为logβ₁ = 3.53 ± 0.05（HMoO₄⁻），logβ₂ = 3.60 ± 0.04（H₂MoO₄⁻），以及logβ₃ = 2.91 ± 0.03（HMoO₃Cl²⁻）。
