【摘要】 用水热法合成了 H8[P4 W14 O58Na4 (H2 O) 2 0 ]· 16 H2 O,通过 X射线单晶衍射、元素分析和IR进行了结构表征 ,用 TG- DTA研究了热稳定性 .晶体属三斜晶系 ,P1空间群 ,a=1.1379(2 )nm,b=1.36 32 (3) nm,c=1.6 2 71(3) nm;α=78.2 0 (3)°,β=71.2 0 (3)°,γ=71.6 2 (3)°;V=2 .2 52 5(8) nm3 ,Z=1,Mr=4 374 .38,Dc=3.2 2 5mg/ cm3 ,μ=18.0 0 7mm-1,F(0 0 0 ) =1972 ,R=0 .0 74 2 ,Rw=0 .2 0 0 4 .标题化合物的阴离子是由两个 PW7O2 9Na2 (H2 O) 10 亚单元通过与两个磷原子上键合的氧连接而成 ,分子内形成了一个 0 .6 6 14nm× 0 .3189nm的微孔 .更多还原

【Abstract】 A novel heteropoly tungstophosphates, H 8[P 4W 14 O 58 Na 4(H 2O) 20 ]·16H 2O, was synthesized by hydrothermal method and characterized by elemental analysis, IR spectrum and single crystal X ray structure analysis. The thermal stability of the compound was investigated by using TG DTA. The crystal is triclinic system with space group P 1, a = 1 137 9(2) nm, b = 1 363 2(3) nm, c = 1 627 1(3) nm; α=78 20(3)°, β=71 20(3)°, γ=71 62(3)°; V = 2 252 5(8) nm 3, Z=1, M r= 4 374 38 , D c=3 225 mg/cm 3, μ =18 007 mm -1 , F(000)= 1 972 , R = 0 074 2 , R w= 0 200 4 . The result of structure analysis shows that the anion of the compound consists of two PW 7O 29 Na 2(H 2O) 10 subunits and two linked phosphorous atoms. A kind of microporous with size of 0.661 4 nm× 0.318 9 nm was formed in the crystal structure.更多还原