苦味酸钆(Ⅲ)配合物的合成与晶体结构

SYNTHESIS AND CRYSTAL STRUCTURE OF GADOLINIUM(Ⅲ) PICRATE COMPLEX

在 p H6.3时合成了苦味酸钆配合物并获得其晶体 ,X射线单晶衍射、元素分析、红外光谱分析表明该配合物组成为 [Gd( pic) 2 · 6H2 O]( pic)· 6H2 O.晶体属单斜晶系 ,P2 ( 1 ) / n空间群 ,晶胞参数为 :a=0 .763 8( 1 )nm,b=2 .75 0 4( 5 ) nm,c=1 .780 1 ( 3 ) nm,β=99.2 9( 1 )°,V=3 .690 5 ( 1 2 ) nm3,Z=4,Dc=1 .90 4g/ cm3,μ=1 .92 7mm- 1 ,F( 0 0 0 ) =2 1 1 6,R1 =0 .0 2 41 ,w R2 =0 .0 5 3 2 .晶体结构分析表明 :钆与 2个苦味酸根离子和 6个水分子配位形成 9配位的畸变三冠三角棱柱体 ,配合物中还有 1个苦味酸根离子和

The gadolinium picrate complex has been synthesized and characterized by X-ray single crystal diffraction,elemental analysis and IR.The results show that the title compound,with chemical formula [Gd(pic)_2·6H_2O](pic)·6H_2O,crystallizes in the monoclinic space group P2(1)/n,a=0.763 8(1),b=2.750 4(5),c=1.780 1(3) nm,β=99.29(1)°,V=3.690 5(12) nm^3,Z=4,D_c=1.904 g/cm^3,μ=1.927 mm^(-1),F(000)=2 116,R_1=0.024 1,wR_2=0.053 2.The crystal structure analysis indicates that two picrate anions and six water molecules coordinate that gadolinium.In addition,there is one free picrate anion and six lattice water molecules in the complex.