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在 p H≈ 6.5及稀土盐 Gd Cl3 · 6H2 O或 Ce( NO3 ) 3 · 6H2 O的存在下 ,Na2 WO4· 2 H2 O与Na As O2 及 Co( NO3 ) 2 · 6H2 O反应 ,得到了夹层型杂多钨酸盐 N( CH3 ) 4 Na6[Na3 {Co( H2 O) }2 WO( H2 O) ( As W9O3 3 ) 2 ]· 35 H2 O单晶 ,用 X射线单晶衍射法及元素分析确定了其结构 ,晶胞参数为 :a=1 .395 ( 1 8) nm,b=1 .90 ( 2 ) nm,c=2 .2 9( 3) nm,α=1 0 2 .3( 4 )°,β=94.7( 3)°,γ=1 0 5 .3( 3)°,V=5 .65 6( 1 2 5 ) nm3 ,Z=2 ,空间群 Pī,R1=0 .0 60 0 ,w R2 =0 .1 2 0 7( I>2σ)。[Na3 {Co( H2 O) }2 WO( H2 O) ( As W9O3 3 ) 2 ]7-具有 C2 v对称性 ,Co2 +的配位数均为 5 .对题示化合物进行了 IR,UV- Vis表征 ,讨论了其形成条件
Na2 WO4 · 2 H 2 O reacts with Na As O2 and Co (NO3) 2 · 6H2O in the presence of p H ≈ 6.5 and rare earth salts Gd Cl3 · 6H2O or Ce (NO3) 3 · 6H2O, resulting in a sandwich Type heteropolytungstate N (CH3) 4 Na6 [Na3 {Co (H2 O)} 2 WO (H2 O) (As W9O3 3) 2] · 35 H2 O single crystal, single crystal X-ray diffraction and elemental The structure and the unit cell parameters were analyzed and confirmed. The unit cell parameters were as follows: a = 1.395 (18) nm, b = 1.90 (2) nm, c = 2.29 (4) °, β = 94.7 (3) °, γ = 1 0 5 .3 (3) °, V = 5 .65 6 (1 2 5) nm3, Z = 2 and the space group Pī, R1 = 0. 0 60 0, w R2 = 0 .1 2 0 7 (I> 2σ). The crystal structure of [Na3 {Co (H2 O)} 2 WO (H2 O) (As W9O3 3) 2] 7- has C2 v symmetry and the number of coordination of Co2 + is 5. IR, UV- Vis characterization, discussed the formation conditions