一种基于吡啶-吡嗪酰胺配体的Keggin型多酸基化合物的组装及光催化性能  

Assembly and photocatalytic property of a Keggin-type POM-based complex constructed by a pyridyl-pyrazine amide ligand

作　　者：曾凌[1] 白雪 王青林[1] 林宏艳[1] 

机构地区：[1]渤海大学化学化工学院,辽宁锦州121013

出　　处：《渤海大学学报（自然科学版）》2017年第3期246-251,共6页Journal of Bohai University:Natural Science Edition

基　　金：国家自然科学基金项目(No:21501013)

摘　　要：设计合成一种新的吡啶-吡嗪酰胺配体(pdya=N-(吡啶-3-基)吡嗪酰胺),并将其与Keggin型多酸H_3(PMo_(12)O_(40))·6H_2O在水热条件下反应合成了一种新的多酸基化合物杂化材料{H[(Hpdya)_2(PMo_(12)O_(40))]}_n,并通过元素分析、红外光谱、热重和单晶X-射线衍射对化合物的结构进行了表征.标题化合物分子式是C_(20)H_(19)PMo_(12)N_8O_(42),三斜晶系,P 21/n空间群,Mr=2225.68,V=2.6536(2)nm^3,a=1.23920(6)nm,b=1.53750(7)nm,c=1.40440(7)nm,β=97.3830(10)°,Z=2,Dc=2.784 g/cm^3,μ=2.877 mm^(-1),F(000)=2098,Rint=0.0401,R=0.0749,wR=0.2187.标题化合物的结构单元中包含游离的质子化的有机吡啶-吡嗪酰胺配体Hpdya和无机Keggin型[PMo_(12)O_(40)]3-多阴离子,并通过吡啶-吡嗪酰胺配体和[PMo_(12)O_(40)]3-多酸阴离子间存在的氢键作用拓展成一维超分子链结构.标题化合物作为一种新的无机-有机杂化材料不仅有较好的热稳定性,而且其在紫外光照射下可以有效的催化降解有机染料分子.A new pyridyl-pyrazine amide ligand(pdya = N-(pyridin-3-yl) pyrazinamide) has been designed and synthesized,then the Keggin-type polyoxometalate-based complex { H [(Hpdya)2(PMo_(12)O_(40)) ]}nconstructed by the pdya ligand was obtained in the hydrothermal condition.The structure of the title complex was characterized by the elemental analysis,IR spectra,thermogravimetric analysis and single crystal X-ray diffraction.Results reveal that the title complex is triclinic system with P 21/n space group,its formula is C_(20)H_(19)PMo_(12)N_8O_(42),Mr= 2225.68,V = 2.6536(2) nm^3,a = 1.23920(6) nm,b = 1.53750(7) nm,c = 1.40440(7) nm,β = 97.3830(10) °,Z = 2,Dc= 2.784 g/cm^3,μ = 2.877 mm^(-1),F(000) = 2098,R_(int)= 0.0401,R= 0.0749,wR = 0.2187.The structural unit of the title complex is consist of the protonated pyridyl-pyrazine amide ligand Hpdya and inorganic[PMo_(12)O_(40)]^(3-)polyanions.The hydrogen-bonding interactions between the organic Hpdya ligands and [PMo_(12)O_(40)]^(3-)anions can lead to the formation of the one-dimensional supramolecular chain.The title complex has good thermal stability and possesses the photocatalytic activities towards the degradation of methylene blue under UV irradiation.

关 键 词：吡啶-吡嗪酰胺配体 Keggin型多酸 杂化材料 氢键作用 光催化性能 

分 类 号：O614.812[理学—无机化学]