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在pH值为5.5的HAc-KAc缓冲溶液中,以α-K8[SiW11O39]·13H2O和Ce(NO3)3为原料合成了硅钨杂多酸根稀土双系列化合物K13[Ce(SiW11O39)2]·19H2O,并用IR、UV光谱和X射线单晶衍射等手段进行了表征.化合物属于三斜晶系,P墿空间群,a=1.3745(3)nm,b=1.9331(4)nm,c=2.0853(4)nm;α=112.24°,β=106.35(3)°,γ=96.72(3)°;V=4.7628(16)nm3,Z=4,Dc=4.462Mg/m3;F(000)=5588,u=27.708mm-1.由13054个可观测衍射点[I≥2σ(I)]用于精修所有的结构参数,得一致性因子R1=0.0743,wR2=0.1708.单晶结构解析表明,标题化合物的分子由13个钾离子,19个结晶水分子和1个杂多阴离子[Ce(SiW11O39)2]13-组成,化合物中Ce3+离子为八配位,畸变的四方反棱柱构型.
In the HAc-KAc buffer solution with pH value of 5.5, a series of rare earth silicate heteropoly compound K13 [Ce (SiW11O39) 2] · were synthesized from α-K8 [SiW11O39] · 13H2O and Ce (NO3) 19H2O, and characterized by IR, UV spectra and single crystal X-ray diffraction.The compounds belong to the triclinic system with space group P = 1.3745 (3) nm, b = 1.9331 (4) nm and c = 2.0853 (4) nm; α = 112.24 °, β = 106.35 (3) °, γ = 96.72 (3) °; V = 4.7628 (16) nm3, Z = 4, Dc = 4.462 Mg / 5588, u = 27.708mm-1. All the structural parameters were refined by 13054 observable diffraction points [I≥2σ (I)], and the concordance factor R1 = 0.0743 and wR2 = 0.1708. , The title compound consists of 13 potassium ions, 19 crystal water molecules and one heteropolyanion [Ce (SiW11O39) 2] 13-. The Ce3 + ions in the compounds are octahedral and distorted tetragonal antiprism configurations.