三铌和三过氧铌钨磷杂多配合物的合成、表征及催化性能

Synthesis and Catalytic Activity of Triniobium and Triperoxyniobium Heteropolytungstophophates

合成了 6种过氧铌杂多配合物M4H2 [PW9(NbO2 ) 3 O3 7]和M6[PW9Nb3 O40 ]·xH2 O(M =(CH3 ) 4 N+ ,(C4H9) 4 N+ ,(C2 H5) 4 N+ ,(C7H15) 4 N+ )。用IR光谱、UV光谱、极谱 循环伏安、183 WNMR谱等测试方法对其性质、结构进行了研究。结果表明 ,其阴离子具有Keggin结构。催化氧化实验表明 ,合成的化合物对催化氧化反应具有活性 。

Six heteropoly complexes M 3H 2\[PW 9(NbO 2) 3O 37\]·xH 2O and M 4-mH m\[PW 9Nb 3O 40\]·xH 2O(M=(CH 3) 4N +, (C 4H 9) 4N +,(C 2H 5) 4N +, (C 7H 15) 4N +) were synthesized and characterized. IR, UV spectrometry, polarography and chemical titration confirmed the existence of NbO 2 groups in the complexes. All their 183W NMR spectra have six peaks, showing the Keggin structure of anions in the compounds. Oxidation of maleic acid into tartaric acid showed that the complexes containing peroxy ions exhibited higher catalytic activity than those without peroxy ions.