Lanthanide contraction and pH value controlled structural change in a series of rare earth complexes with p-aminobenzoic acid

被引：40

作者：

Sun, HL

Ye, CH

Wang, XY

Li, JR ^{[1
]}

Gao, S

Yu, KB

机构：

[1] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China

[2] Acad Sinica, Chendgu Ctr Anal & Measurement, Chengdu 610041, Peoples R China

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2004年 / 702卷 / 1-3期

关键词：

rare earth; structure; p-aminobenzoic acid; lanthanide contraction; pH value;

D O I：

10.1016/j.molstruc.2004.06.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of rare earth complexes with p-aminobenzoic acid (HL) have been synthesized: [RE2L6(H2O)(2)](n) [RE = La (1), Ce(2), Pr(3), Sm(4), Eu(5), Tb(6), Dy(7), Er(9)] and [RE2L6(H2O)(4)](.)2H(2)O [RE = Tb(6'), Ho(8), Yb(10), Lu(11), Y(12)]. The crystal structures of 1, 2, 6, 6', 7, 9 and 12 have been determined and the isomorphous relationships of the others have been identified. Their structures change from two-dimensional (2D) array (the coordination number of the metal ions is nine for 1 and eight for 2-7 and 9) to double-nuclear structure (the metal ions are eight-coordinated) for 6', 8 and 10-12, as controlled by lanthanide contraction. The structural type has been found influenced by the pH value of the reaction mixtures. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：77 / 83

页数：7

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