巨轮型纳米多孔钼氧基多金属氧酸盐化合物表面活性部位的检测  

Detecting active sites on the surface of nano porous giant wheel-shaped Mo-O based polyoxometalate

作　　者：周云山[1] 赵洪量[1] 李豫豪[1] 张立娟[1] 

机构地区：[1]化工资源有效利用国家重点实验室,北京化工大学理学院,北京100029

出　　处：《科学通报》2011年第9期645-651,共7页Chinese Science Bulletin

基　　金：国家自然科学基金(20541001,20771012);北京市自然科学基金(2083030);归国学者科研基金资助项目

摘　　要：利用谷氨酸盐为探针分子,通过单晶X射线结构解析、IR、元素分析、1HNMR和TG等综合分析手段,成功检测到可以看做MoO3类似物的巨轮型纳米多孔钼氧基多金属氧酸盐表面在特定条件下的反应活性点,与此同时实现了用多官能团有机分子对巨轮型金属氧簇内表面的功能型修饰.Z-扫描实验表明,所得到的这种有机-无机杂化化合物在能量为15μJ的532nm波长、18ps激光脉冲作用下,具有显著的非线性光学反饱和吸收和自聚焦响应.In some cases, the active sites on the surface of molybdenum oxide based {Mo154}-type clusters, which can be treated as a soluble molybdenum oxide analogue, can be simply and directly monitored or detected. This can be achieved through the formation and characterization of a new compound： Na2Gd4[MoVI126MoV28O462H14（H2O）42（HOOCCH2CH2CH（NH3＋）COO-）14]·ca.300H2O. This compound contains nanosized ring-shaped clusters with coordinated glutamate ligands on the inner wall of the cavity. The multiphilic ligands containing multifunctional groups attach to the inner wall of the cluster via carboxylate groups. This demonstrates that for certain experimental parameters active sites/areas of the cluster surface can be directly monitored and detected. Also, novel surfaces within the cavity of a nano-structured ring-shaped cluster can be generated. This results in a new type of organic/inorganic hybrid, which exhibits a significant nonlinear optical self-focusing response and nonlinear reverse saturation absorption for a 532-nm laser pulse of power E0= 15 μJ with a duration of 18 ps.

关 键 词：三氧化钼 表面活性点检测 表面功能化 有机无机杂化化合物 非线性光学效应 

分 类 号：TB383.1[一般工业技术—材料科学与工程]