一例多钒酸盐杂化材料的制备及高效催化烯烃环氧化

Preparation and efficient catalysis for olefins epoxidation of a polyoxovanadate⁃based hybrid

以2-(2-吡啶基)咪唑(pIM)、Co^(2+)和NaVO_(3)为原料,在水热条件下,制备了新的钒氧簇化合物[Co(pIM)V_(2)O_(6)](1)。采用X射线单晶衍射、粉末X射线衍射、傅里叶变换红外光谱和元素分析等方法对化合物进行了表征。单晶解析表明,该化合物由VO_(4)四面体和CoO_(3)N_(2)四方锥通过氧原子共边、共角连接成二维结构。基于钒氧簇在催化氧化体系中的高效活性,1作为非均相反应的催化剂,在以H_(2)O_(2)为氧化剂的催化烯烃环氧化反应中表现出优秀的催化性能,催化剂能够多次重复使用且活性基本保持不变。此外,磁化率研究表明1中存在反铁磁相互作用。

A new polyoxovanadate compound[Co(pIM)V_(2)O_(6)](1)was hydrothermally synthesized,where pIM stands for 2-(2-pyridyl)imidazole.For its characterizations,an integration of X-ray single crystal diffraction,powder X-ray diffraction,Fourier transform infrared spectra,and elemental analysis was accomplished.The compound exhibited a 2D architecture composed of VO_(4) tetrahedra and CoO_(3)N_(2) square pyramids via both edge-and corner-sharing.Considering the excellent catalytic oxidation features of polyoxovanadate,compound 1 was used as an efficient heterogeneous catalyst for the epoxidation of olefins with H_(2)O_(2) as an oxidant,and could be reused without consuming activity.Besides,the magnetic studies indicated the antiferromagnetic interactions in 1.CCDC:2285966.