六水合硝酸镝(Ⅲ)的晶体结构

Crystal Structure of Dysprosium(Ⅲ) Nitrate Hcxahydratc

镧系硝酸盐高水合物晶体结构迄今未进行系统分析,可能是因为它们易吸潮而难于进行测定。本文报道了题目化合物的制备和结构。[Dy(H_2O)_4(NO_3)_3]·2H_2O的单晶用RASA-ⅡS(RIGAKU)全自动四圆单晶衍射仪收集衍射数据进行结构分析,最终偏离因子R=0.142.晶体属三斜晶系,空间群 P,晶胞参数α=0.6703(4)nm,b=0.9048(5)nm,C=1.1535(8)nm,α=70.60(5)°,β=89.08(6)°,γ=69.23(5)°,z=2.结构分析证实:晶胞中有两个[Dy(H_2O)_4(NO_3)_3]·2H_2O分子,镝与3个NO_3^-及4个H_2O中的氧原子形成10配位的畸变20面体结构。

The crystal structure of nitrale high-hydrates for lanthanoid has not been systematically analyzed, probablyth cause of the crystals being very hygroscopic, thereby difficult to treat. The preparation and structure of title compound have been reported here. The crystal structure of [Dy(H_2O)_4(NO_3)_3] ·2H_2O was determined on a RASA-II S(RIGAKU) diffractometer with X-ray intensity data collected in 3°<20<60°. The space group is PI with a= 0.6703(4)nm, b=0.9048(5)nm, c=1.l535(8)nm, α=70.60(5)°, β=89.08(6)°, γ=69.23(5)°, Z = 2. The structure was solved by Patterson method and refined with a fullmatrix leastsquares procedure to R =0.143. Each of Dy((Ⅲ)) ions is coordinated by ten oxygen atoms of three nilrale groups and four water molecules forming a distorted icosahedron.