超分子结构[Co(C_2O_4)_3]^(3-)插层镁铝水滑石的组成及热稳定性  

COMPOSITION AND THERMAL STABILITY OF SUPRAMOLECULAR ASSEMBLY[Co(C_2O_4)_3]^(3-)INTERCALATED Mg-Al LAYERED DOUBLE HYDROXIDES

作　　者：王力耕[1] 余锋[1] 潘国祥[1] 应逸文[1] 龚渊[1] 倪哲明[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310014

出　　处：《硅酸盐学报》2009年第1期72-75,共4页Journal of The Chinese Ceramic Society

基　　金：浙江省科技厅计划项目(2007C21109)。

摘　　要：以Mg_(0.67)Al_(0.33)(OH)_2(NO_3^-)_(0.33)·0.61H_2O水滑石为前驱体,用离子交换法将三草酸合钴酸根([Co(C_2O_4)_3]^(3-))插入到层状双金属氢氧化物(layered double hydroxides,LDHs)层间,用X射线衍射谱、Fourier变换红外光谱、热重-差热分析和电感偶合等离子体发射光谱等对样品进行表征。结果表明:[Co(C_2O_4)_3]^(3-)可取代层间的No_3^-组装得到晶体结构良好的[Co(C_2O_4)_3]^(3-)-LDHs。[Co(C_2O_4)_3]^(3-)-LDHs的层间距为1.008 nm;通过与半经验PM3分子轨道法优化计算得到的[Co(C_2O_4)_3]^(3-)三维尺寸进行比较,推测客体[Co(C_2O_4)_3]^(3-)是沿短轴垂直于层板的方式单层交替排布于层间,与主体层板通过氢键与静电作用形成超分子结构,增加了[Co(C_2O_4)_3]^(3-)的稳定性。[Co(C_2O_4)_3]^(3-)pillared Mg-Al layered double hydroxides(LDHs)were successfully assembled by ion-exchange method using Mg_(0.67)Al_(0.33)(OH)_2(NO_3^-)_(0.30)·0.61 H_2O as a precursor.The samples thereby obtained were characterized by X-ray diffraction,Fou- tier transform infrared microscopy,thermogravimetric-differential thermal analysis and inductive coupled plasma emission spec- trometry measurements.The results show that the original interlayer nitrate anions of the Mg/Al-LDHs can be replaced by [Co(...

关 键 词：水滑石 插层 超分子结构 热稳定性 

分 类 号：TB321[一般工业技术—材料科学与工程]