尿素与Keggin结构磷钼酸电荷转移盐的合成与表征

SYNTHESIS AND CHARACTERIZATION ON THE CHARGE-TRANSFER COMPLEXE OF KEGGIN MOLYBDOPHOSPHORIC HETEROPOLYACID AND UREA

在水中合成了两种新的有机 金属氧酸盐电荷转移配合物H3 PMo12 O4 0 ·4.5CO(NH2 ) 2 ·2 .5H2 O和H3 PMo12O4 0 ·12CO (NH2 ) 2 ,用IR、UV、TG、XRD及元素分析对其进行了表征。结果表明两种化合物中均存在[(H2 N) 2 COH]+ ,阴离子保持Keggin结构 ,但Keggin结构由于尿素的有机给体作用发生了不同程度的畸变。H3 PMo12 O4 0 ·4.5CO(NH2 ) 2 ·2 .5H2 O在固态 ,H3 PMo12 O4 0 ·12CO(NH2 ) 2

Two new organo polyoxometalate charge transfer complexes H 3PMo 12 O 40 ·4.5CO(NH 2) 2·2.5H 2O and H 3PMo 12 O 40 ·12CO(NH 2) 2 were synthesized and their structures were elucidated by IR,UV,TG,XRD and elementary analyses. The results indicated that there is charge transfer between urea and polyanion and the existence of [(H 2N) 2COH] +.Both of the complexes keep the Keggin structure of anion,but the Keggin structure is more or less transformed under the influence of urea.H 3PMo 12 O 40 ·4.5CO(NH 2) 2·2.5H 2O showed photochromism in its solid state,while H 3PMo 12 O 40 ·12CO(NH 2) 2 showed photochromism in its water solution.