Keggin结构过氧铌钨磷杂多配合物的合成、表征及催化性能

The eight heteropoly complexes M4H2[PW9（NbO2）3O37]·xH2O和M4-mHm[PW11（NbO2）O39]·xH2O(M=Me4N+（TMA）,Bu4N+（TBA）,Et4N+（TEA）,He4H+（THA）were synthesized and characterized by IR,UV spectrometry,polarography and 183W NMR spectra.The experimantal results indicated that they were all the Keggin structure and the reduced electric potential of the complexes arised over-0.3 with entering of NbO2 groups.Experiments on oxidation of maleic acid into tartaric acid showed that the complexes containing peroxo ions exhibited higher catalytic activity than those without peroxo ions.The catalytic activity of heteropoly complexes with（NbO2）3 was higher than that of heteropoly complexes with（NbO2）.

铌钨磷杂多配合物的稳定性研究

系统地研究了一铌、二铌、三铌取代的钨磷杂多配合物的固体热稳定性和其水溶液对酸碱的稳定性，并通过ＸＰＳ谱的研究，找出了取代铌原子数与Ｎｂ３ｄ５／２的电子结合能的关系，并给予了合理的解释。

单铌和单过氧铌杂多配合物的合成、表征及催化性能

合成了新的单过氧铌钨磷杂多酸盐 Mn H4- n[PW1 1 (Nb O2 ) O39]· x H2 O (M=Me4N+ -(TMA) ,Et4N+ (TEA) ,Bu4N+ (TBA) ,Hep4N+ (THA) )和单铌取代钨磷酸盐 M4[PW1 1 Nb O40 ]·x H2 O(M=TBA,THA和 K+ ) .IR和 UV光谱、极谱 I- - S2 O2 - 3 滴定证明 [PW1 1 (Nb O2 ) O39]4- 中有Nb O2 基存在 ,1 83 W NMR数据指出杂多阴离子中有 6种环境的钨原子 ,证明其阴离子仍保持Keggin结构 .实验表明 ,过氧杂多配合物的催化活性高于非过氧杂多配合物 .