【摘 要】
：
合成了标题化合物K4.5Na4(H_3O)3.5 [Ce(SiW11O39)2]·23H_2O，用单晶X-ray 衍射方法测定了它的结构，该晶体属三斜晶系，空间群P，a=16.531(4) ，b=23.193(4)，c=12.764 (2)?，α= 99.740(
【机 构】
：
福州大学化学系! 福州350002,中科院物构所结构化学国家重点实验室!福州350002
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合成了标题化合物K4.5Na4(H_3O)3.5 [Ce(SiW11O39)2]·23H_2O，用单晶X-ray 衍射方法测定了它的结构，该晶体属三斜晶系，空间群P，a=16.531(4) ，b=23.193(4)，c=12.764 (2)?，α= 99.740(6)，β = 91.90(1), γ = 94.84(1)°，V = 4801(2) ?3，Mr = 6180.91, Z=2，Dc = 4.276 g·cm－3,μ(MoKα)= 27.06 mm－1, F(000)= 5359, R = 0.0781 ，wR = 0.1838，I >2((I) 的可观察衍射点11936个。该分子是由2个α-SiW11O39结构单元通过1个铈离子联结起来，铈离子八配位，形成了1个畸变的十二面体结构，Ce-O键长2.39(2)～2.45(3) ?。在杂多化合物中，硅氧四面体的氧原子存在μ4-Oc和μ3-Oc的2种配位状态。
The title compound K4.5Na4 (H_3O) 3.5 [Ce (SiW11O39) 2] · 23H_2O was synthesized and its structure was determined by single crystal X-ray diffraction. The crystal belongs to triclinic system with space group P, a = 16.531 Α = 99.740 (6), β = 91.90 (1), γ = 94.84 (1) °, V = 4801 (2) 3 3, b = 23.193 (4) Mr = 6180.91, Z = 2, Dc = 4.276 g · cm -3, μ (MoKα) = 27.06 mm -1, F (000) = 5359, R = 0.0781, wR = 0.1838, I> 2 The diffraction spot can be observed 11936. The molecule is composed of two α-SiW11O39 structural units linked by a cerium ions, eight coordination of cerium ions, forming a distorted dodecahedron structure, Ce-O bond length 2.39 ( 2) ~ 2.45 (3) In the heteropoly compounds, there are two kinds of coordination states of μ4-Oc and μ3-Oc in the oxygen atoms of the silicon tetrahedron.
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