基于{V_(18)O_(42)}多钒氧簇的设计合成及其催化Knoevenagel缩合反应性能  

Synthesis of Polyoxovanadate Based on{V_(18)O_(42)}and Its Catalytic Performance for Knoevenagel Condensation Reaction

作　　者：石宇 马丽 王文辉 韩占刚[1] 高元哲[1] SHI Yu;MA Li;WANG Wenhui;HAN Zhangang;GAO Yuanzhe(College of Chemistry and Materials Science,Hebei Normal University,Hebei Key Laboratory of Inorganic Nano-materials,National Demonstration Center for Experimental Chemistry Education,Hebei Shijiazhuang 050024,China)

机构地区：[1]河北师范大学化学与材料科学学院,河北省无机纳米材料重点实验室,国家实验化学教育示范中心,河北石家庄050024

出　　处：《河北师范大学学报（自然科学版）》2023年第1期66-73,共8页Journal of Hebei Normal University：Natural Science

基　　金：河北省自然科学基金(B2021205027,B2021205024);河北师范大学基金项目(L2020K03,L2020B11)。

摘　　要：采用水热技术合成一例含钴的有机无机杂化多钒氧簇,其分子式为[Co(C_(8)H_(2)0N_(4))]4[Ⅳ^(V)_(13)Ⅴ^(V)_(5)O_(42)(Cl)]·6H_(2)O(1).研究表明,化合物1中[V_(13)^(Ⅳ)V_(5)^(Ⅴ)O_(42)(Cl)]^(8-)阴离子簇表面的富氧原子使其具有一定的Lewis碱性,其在苯甲醛与丙二腈的Knoevengel缩合反应中表现出优异的催化性能.室温下,30min内反应转化率和选择性可分别达到98%和100%;催化剂回收后至少可以重复使用4次,具有较好的循环稳定性.A new organic-inorganic hybrid polyoxovanadate[Co(C_(8)H_(2)0N_(4))]4[Ⅳ^(V)_(13)Ⅴ^(V)_(5)O_(42)(Cl)]·6H_(2)O(1).has been synthesized by hydrothermal synthesis.Research shows that the polyanionic cluster[V_(13)^(Ⅳ)V_(5)^(Ⅴ)O_(42)(Cl)]^(8-) in compound 1 has an exposed nucleophilic surface due to external oxygen atoms,which makes it possess a certain Lewis basicity.Therefore,compound 1 exhibited excellent catalytic performance in the Knoevengel condensation reaction of benzaldehyde and malononitrile.The conversion and selectivity of condensation reaction can reach 98%and 100%within 30 min at room temperature.Compound 1 shows good cycle stability for the current catalytic reaction and can be reused for at least 4 times after recovery.

关 键 词：多钒氧簇 水热合成 非均相催化剂 KNOEVENAGEL缩合反应 

分 类 号：O61.1[理学—无机化学]