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在pH =4.5的水溶液中 ,Na2 7[NaAs4W40 O14 0 ]·60H2 O与NiCl2 ·6H2 O ,NaVO3 ·4H2 O和NH4Cl反应得到了不同过渡金属离子占据S2位的新型杂多钨酸盐 (NH4) 2 1[{Na2 (H2 O) 3 }Ni(H2 O)VOAs4W40 O14 0 ]·5 3H2 O ,用X射线单晶衍射法和元素分析确定了其结构 .晶胞参数为 :a =2 .3 3 0 5 ( 14 )nm ,b =2 .9467( 19)nm ,c =1.2 671( 16)nm ,V =8.70 1( 9)nm3 ,Z =2 ,空间群Pmmn .在杂多阴离子 [{Na2 (H2 O) 3 }Ni(H2 O)VOAs4W40 O14 0 ] 2 1-中 ,配体 {As4W40 }的 1个中心位和 4个S2位可以选择性地被不同的金属离子所占据 ,其中相对的 2个S2位被Ni2 + 和V5+ 统计性地占据 ,每种离子占据的概率为 5 0 % ;{As4W40 }中的另 2个S2位分别被2个Na+ 占据 ,2个Na+ 间通过一配位水分子桥连 .讨论了标题化合物的IR ,TG和磁学性质
The reaction of Na2 7 [NaAs4W40 O14 0] · 60H2O with NiCl2 · 6H2O, NaVO3 · 4H2O and NH4Cl gave a new heteropolytungstate (NH4) with different transition metal ions occupying the S2 position in aqueous solution of pH = 4.5. Its structure was confirmed by single crystal X-ray diffraction and elemental analysis. The unit cell parameters were: a = 2.3 (Ni2 +) VOAs4W40 O14 0] The space group Pmmn is the most important one in the heteropolyanion [{(3), (5) and (9) nm, b = 2.9467 (19) nm, One center and four S2 positions of the ligand {As4W40} can be selectively occupied by different metal ions in Na2 (H2 O) 3} Ni (H2 O) VOAs4W40 O14 0] 2 1- Of the two S2 positions are occupied statistically by Ni2 + and V5 +, and the probability of each ion occupying is 50%; the other two S2 positions in {As4W40} are occupied by two Na +, two Na + Bit-water molecule bridge.The IR, TG and magnetic properties of the title compound are discussed