层状结构钒磷酸盐(H_2NC_4H_8NH_2)_(0.5)[(VO)(PO_4)]的水热合成及热稳定性

Hydrothermal Synthesis and Thermal Stability of Vanadium Phosphate(H_2NC_4H_8NH_2)_(0.5)[(VO)(PO_4)]

采用新配方水热合成了层状结构钒磷酸盐(H2NC4H8NH2)0.5[(VO)(PO4)],用ICP、TG-DTA、单晶XRD和动态XRD对合成物进行了表征。结果表明,该化合物有机模板的开始分解温度,在空气气氛中为343℃,在氮气气氛中为376℃。有机模板的分解逃逸导致了结构的破坏。随着温度的升高结构发生重组,约760℃时形成(VO)2P2O7;温度继续升高,(VO)2P2O7进一步氧化,形成钒磷氧化物新物相。与结构相似化合物(H3NCH2CH2NH3)[(VO)(PO4)]的热稳定性比较表明,有机模板的热稳定性及其与无机骨架结合的牢固性影响化合物的热行为。

The thermal behavior of the layer structure vanadium phosphate （H2NC4H8NH2 ）0.5 [ （VO） （ PO4 ） ], which was prepared hydrothermally with a mole ratio of the starting material different from that reported, was characterized. Results show that the starting decomposition temperature of the organic template in the compound is 343℃ in air and 376℃ in N2 atmosphere. After removal of the organic template, the structure collapses. When temperature increased to about 760℃, （VO）2P2O7 was formed. With further increasing of temperature, （VO）2P2O7 was oxidized to form an unidentified new phase. Comparison of the thermal behavior of the title compound to that of an isostructure compound （HsNCH2CH2NH3） [ （VO）（PO4） ] indicates that the thermal stability of the organic template and its bonding to the framework may influence the thermal behavior of the compound.