摘要
以钛酸异丙酯为Ti源,在不同酸度条件下合成了一钛取代的钨磷多金属氧酸盐。用IR、元素分析3、1PNMR对样品的结构进行了表征,并对样品的存在状态以及各状态间的相互转化进行了研究。结果表明,合成体系的酸度强烈影响着产物的状态,低酸度条件下得到的产物为一钛取代物的质子化单体,而高酸度条件下得到的产物则为质子化单体和其二聚体的混合物。二聚体和单体在酸、碱条件下可以相互转化,溶液的浓度以及溶液的久置也会导致单体、二聚体间发生转化。
The TiN-substituted tungstophosphates were synthesized under different acidities using Ti （OPr^i ）4 as Ti source . The structures of the samples were characterized by IR, element analysis and ^31P NMR. The states of the samples as well as the interconversion between the states were investigated upon these characterizations. It is demonstrated that the state of Ti^IV -substituted tungstophosphate is influenced greatly by the acidity in synthesis system. The mixtures of dimers and monomers of Ti^IV-substituted compounds were obtained under higher acidities, while only monomers were obtained under lower acidities conditions. The conversion between the monomer and dimer can be aroused by acid or base, and can also occur in a diluted solution and after a long time of storing of the solution.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2008年第8期1012-1017,共6页
Chemical Research and Application
基金
国家自然科学基金项目(20473037)
江苏省教育厅自然科学基金项目(04KJB150069)
国家人事部留学人员科技活动项目(2005103SB9BH51)
