A Series of Heterometallic Three-Dimensional Frameworks Constructed from Imidazole-Dicarboxylate: Structures, Luminescence, and Magnetic Properties

被引:112
作者
Feng, Xun [1 ]
Ma, Lu-Fang [1 ]
Liu, Lang [3 ]
Wang, Li-Ya [1 ,2 ]
Song, Hong-Liang [1 ]
Xie, Shi-Yu [1 ]
机构
[1] Luoyang Normal Univ, Coll Chem & Chem Engn, Luoyang 471022, Peoples R China
[2] Nanyang Normal Univ, Coll Chem & Pharm Engn, Nanyang 473601, Peoples R China
[3] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450001, Peoples R China
基金
中国国家自然科学基金;
关键词
LANTHANIDE COORDINATION POLYMERS; NEAR-INFRARED LUMINESCENCE; SECONDARY BUILDING UNITS; METAL-ORGANIC FRAMEWORK; SINGLE-MOLECULE-MAGNET; CRYSTAL-STRUCTURES; PHOTOPHYSICAL PROPERTIES; TRIVALENT LANTHANIDE; COMPLEXES; LN;
D O I
10.1021/cg4009587
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The combination of lanthanide and zinc nitrates reaction with a rigid 1-H-2-methyl-4,5-imidazole-dicarboxylic acid yields a new, zinc complex of Zn-(Hmimda)(2)center dot 2H(2)O (1) and a family of heteronuclear polymers, namely, {[Ln(2)Zn(2)(mu(3)-Hmimda)(2) (mu(3)-mimda)(2)center dot 4H(2)O]center dot mH(2)O}(n), Ln = Sm, m = 2(2), Ln = Eu, m = 3 (3), Ln = Gd, m = 2 (4), Ln = Tb, m = 3 (5), Ln = Dy, m = 3 (6) (H(3)mimda = 1H-2-methyl-4,5-imidazole-dicarboxylic acid). Structural analysis shows that complexes 2-6 are isostructural and all crystallize in the monoclinic system, except for a slight disparity for 2. They have an extended nonporous structure constructed from tetraheteronuclear edifices with new framework topology, in which the Ln(III)-Zn square tetranuclear complexes act as the second building unit, which are further interconnected by the Hmimda to afford a two-dimensional corrugated layer. Both compounds 5 and 6 exhibit characteristic fluorescence in the visible region. The variable temperature magnetic investigations indicate that the magnetic interactions are mainly ascribed to depopulation of the Stark levels or possible antiferromagnetic couplings. The Dy(III)-Zn(II) compound exhibits possible ferromagnetic couplings and slow magnetic relaxation behavior of a single-molecule magnet nature.
引用
收藏
页码:4469 / 4479
页数:11
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