Li Xuanyao, Li Peihe, Liu Jinghai, Lin Zhengguo, Hu Changwen
Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology Beijing 100081 China
Inner Mongolia Key Laboratory of Carbon Nanomaterials, Nano Innovation Institute (NII), College of Chemistry and Materials Science, Inner Mongolia University for Nationalities Tongliao 028000 China
RSC Adv. 2020 Jun 12;10(38):22515-22521. doi: 10.1039/d0ra02609c. eCollection 2020 Jun 10.
We report the syntheses and structures of two new copper(ii)-containing tungstotellurates(vi) Na[Te WOCu(HO)]·7HO (TeWCu) and Na[TeWOCu(NHCHCO)]·6HO (TeWCu). The two compounds were synthesized by a simple one-pot method and characterized by single-crystal X-ray diffraction (XRD), powder XRD, FT-IR spectroscopy, elemental analysis, and thermogravimetric analysis in the solid state. Furthermore, their catalytic properties for the selective oxidation of thioethers were also studied systematically. The catalytic experiment results indicate that the tungstotellurate(vi) TeWCu is an effective heterogeneous catalyst for the selective oxidation of thioethers to sulfoxides or sulfones by an HO oxidant at room temperature. Under the ambient conditions, TeWCu can convert 99% of methyl(phenyl)sulfane to sulfoxides or sulfones with 96% or 99% selectivity, respectively, and the utilization rate of HO is up to 80%. Furthermore, TeWCu as a heterogeneous catalyst is stable in the reaction and could be reused at least five cycles with conserved activity.
我们报道了两种新型含铜（II）的钨碲酸盐（VI）Na[TeWOCu(HO)]·7HO（TeWCu）和Na[TeWOCu(NHCHCO)]·6HO（TeWCu）的合成及结构。这两种化合物通过简单的一锅法合成，并通过单晶X射线衍射（XRD）、粉末XRD、傅里叶变换红外光谱（FT-IR）、元素分析以及固态热重分析进行了表征。此外，还系统研究了它们对硫醚选择性氧化的催化性能。催化实验结果表明，钨碲酸盐（VI）TeWCu是一种有效的多相催化剂，可在室温下通过HO氧化剂将硫醚选择性氧化为亚砜或砜。在环境条件下，TeWCu可将99%的甲基（苯基）硫醚分别以96%或99%的选择性转化为亚砜或砜，HO的利用率高达80%。此外，TeWCu作为多相催化剂在反应中稳定，可至少重复使用五个循环且活性保持不变。
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