稀土与L-脯氨酸配合物的合成、表征及晶体结构

The Syntheses Characterization and Crystal Structure of Rare Earth Complexes with L-Prolin

本文合成了通式为Ln(L-Pro)_3(H_2O)_2(ClO_4)_3(Ln=Pr、Nd、Er,L-Pro=L-脯氨酸)的固体配合物.元素分析、红外光谱、热分析对配合物进行了表征.培养了镨脯氨酸配合物的单晶,X射线四圓衍射确定了晶体的结构.晶体属于单斜晶系、空间群P2_1,α=0.9879(3),b=2.1883(4),c=1.3393(2)nm,β=91.23(2)°,V=2.895(1)nm^3,Z=2.晶体中每一个镨原子与来自6个L-脯氨酸羧基上的6个氧原子和2个结晶水分子键合,形成了一个八配位的稍有畸变的三角十二面体.每一个L-脯氨酸分子以羧基双齿方式与两个镨离子配位,形成了一个无限长的链状结构.

The complexes of Ln(L-Pro)_3(H_2O)_2(CIO_4)_3(Ln=Pr, Nd and Er. L-Pro=L-Proline) were synthesized and characterized by elemental analysis, IR. spectra and thermal analysis. The singal crystal Pr_2(Zr-Pro)_6(H_2O)_4(ClO_4)_6 was also obtained. The crystal belongs to monoclinic, P2_1, a=0.9879(3)nm, b=2.1883(4)nm, c=1.3393 (2)nm, β=91.23(2)°, V=2.895(1)nm^3, Z=2. R=0.035 for 5032 observed reflections. The coordination polyhedron of Pr(III) ion comprises sis oxygen atoms from L-Pro molecules and two water molecules. Each L-Pro molecule coordinates to two Pr(III) ions through its carboxyl group which serves as a bridging bidentate ligand to form onedimensional chain structure.