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在pH=4.0的水溶液中,NiCl2·6H20,NH4Cl与Na27[NaAs4W40O140].60H2O反应,得到了新的杂多砷钨酸盐(NH4)20[Na2(H2O)2Ni(H2O)5(Ni(H2O)}2As4W40O140].61H2O单晶,用X射线单晶衍射法及元素分析确定了其结构,晶体属三斜晶系,P1空间群;其晶胞参数为:a=1.33135(18),b=1.9722(3),C=3.6430(5)nm,a=78.010(2)。,β=82.145(2)。,γ=74.385(2)。,V=8.978(2)nm3,Z=2,R1=0.0512,wR2=0.0684(I>2σ).在聚阴离子[Na2(H2O)2Ni(H2O)5{Ni(H2O)}2As4W40O140]20-中,2个Ni2+和2个Na+分占大环配体[As4W40O140]28-内的4个S2空位,每个S2位提供4个Od向金属离子配位,2个Ni2+的配位数为6,两个Na+的配位数分别为5和6,另一个Ni2+处于环外,与[As4W40O140]28-的一个端基氧(Od)桥连成键,其配位数为6.
In the aqueous solution of pH = 4.0, NiCl2 · 6H2O and NH4Cl reacted with Na27 [NaAs4W40O140] .60H2O to obtain a new heteropolyacid arsenate tungstate (NH4) 20 [Na2 (H2O) 2Ni )} 2As4W40O140] .61H2O single crystal. The structure of the crystal is determined by X-ray single crystal diffraction and elemental analysis. The crystal belongs to triclinic and P1 space group. The unit cell parameters are a = 1.33135 (18), b = 1.9722 3. C = 3.6430 5 nm a = 78.010 2. β = 82.145 2. γ = 74.385 2. V = 8.978 nm 2. Z = 0.0512, wR2 = 0.0684 (I> 2σ) .In the polyanion [Na2 (H2O) 2Ni (H2O) 5 {Ni (H2O)} 2As4W40O140] 20-, two Ni2 + and two Na + [As4W40O140] 28- 4 S2 vacancies, each S2 provides four Od to the metal ion coordination, the two Ni2 + coordination number 6, the two Na + coordination numbers were 5 and 6, respectively One Ni2 + is outside the ring and bonds with one terminal oxygen (Od) of [As4W40O140] 28-, with a coordination number of 6.