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在pH =7 5的水溶液中 ,咪唑与Na2 WO4,Bi(NO3 ) 3 及Co(NO3 ) 2 反应 ,得到了咪唑配位的新型杂多钨酸盐Na9[{Na (H2 O) 3 }{Co(C3 H4N2 ) }3 (BiW9O3 3 ) 2 ]·3 3H2 O ,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 :空间群P3 - ,a =1 3 90 4( 4 )nm ,b =1 3 90 4( 4 )nm ,c =3 3 169( 13 )nm ,γ =12 0° ,V =5 5 5 3 ( 3 )nm3 ,Z =2 ,R1 =0 0 3 61,wR2 =0 0 5 0 7(I >2σ) .杂多阴离子 [{Na(H2 O) }3 {Co(C3 H4N2 ) }3 (BiW9O3 3 ) 2 ] 9-为夹心式结构 ,两个三空缺Keggin离子α B BiW9O9-3 3 夹层中的中心离子为交替排列的三个Na(H2 O) + 和三个Co(C3 H4N2 ) 2 + ,中心离子钴的配位数为 5 ,该杂多阴离子具有C3v对称性 .对标题化合物进行了磁性质表征 ,拟合结果为J =6 90cm-1 ,g =2 10 ,θ =0 2 5K ,表明该化合物中的Co(II)三核簇存在着铁磁偶合
In the aqueous solution of pH = 7 5, imidazole reacted with Na2 WO4, Bi (NO3) 3 and Co (NO3) 2 to obtain a novel heteropolytungstate Na9 [{Na (H2 O) 3} The structure of the crystal was confirmed by single crystal X-ray diffraction and elemental analysis. The unit cell parameters are: space group P3 -, a = 1 3 90 4 (BiW9O3 3) 2] · 3H 2 O, 4) nm, b = 1 3 90 4 (4) nm, c = 3 3 169 (13) nm, γ = 12 0 °, V = 5 5 5 3 (3) nm3, Z = 2, R1 = 3 61, wR2 = 0 0 5 0 7 (I> 2σ). Heteropolyanion [{Na (H 2 O)} 3 {Co (C 3 H 4 N 2)} 3 (BiW 9 O 3 3) 2] Three vacancies of Keggin ion α B BiW9O9-3 3 sandwich in the center of the ion for the alternating arrangement of three Na (H 2 O) + and three Co (C 3 H 4 N 2) 2 +, the central ion cobalt coordination number 5 The heteropolyanions have the symmetry of C3v.The title compounds were characterized by magnetic properties and the fitting results were J = 690cm-1, g = 210 and θ = 025K, indicating that the Co (II) trinuclear Clusters exist for ferromagnetic coupling