钛取代杂多酸盐甘氨酸超分子化合物的合成及热分解动力学研究

用室温固相法合成了Keggin结构单取代杂多硅钨酸盐甘氨酸超分子化合物α-K4(HGly)3SiW11Ti(H2O)O39].4H2O,用IR、UV、TG-DTA、X-射线粉末衍射等方法对其进行了表征。结果表明:甘氨酸阳离子与杂多阴离子主要靠静电作用结合,超分子化合物中杂多阴离子仍保持Keggin结构。同时,采用TG-DTA技术研究了标题化合物在氮气气氛中的热分解机理及非等温动力学,用Coats-Redfern的积分法和Achar的微商法对配合物的非等温动力学数据进行分析,得出了热分解反应的机理函数、动力学参数以及分解反应的活化能E和lnA。

Synthesis and non-isothermal kinetics of titanium substituted heteropolytungstates and glyine supermolecular compounds

Supermolecular compounds of glycine monosubstituted heteropolytungstates with Keggin structure α-K4(HGly)3SiW11Ti(H2O)O39]·4H2O were synthesized by solid phase reaction in room temperature.The structure was characterized by IR,UV,TG-DTA,X-ray diffraction.The results indicate that glycine combines the electrostatic effect with heteropolytungstates.The heteropoly anion still remains its Keggin structure in supermolecular compounds.The non-isothermalkinetic data were analyzed with the used Coats-Redfern integral method and Achar differential method.The mechanism function,kinetic parameters,apparent activation energy E and pre-exponential factor lnA of the thermal decomposition were obtained.