Three Series of 3d-4f Heterometallic Polymers Based on [LnCu6] or [Ln6Cu24] Clusters and Formate Bridges: Displaying Significant Magnetocaloric Effect

被引:51
作者
Li, Zhong-Yi [1 ,3 ]
Wang, Yu-Xian [1 ]
Zhu, Jiang [2 ]
Liu, Shu-Qin [1 ]
Xin, Gang [1 ]
Zhang, Jian-Jun [1 ]
Huang, He-Qing [1 ]
Duan, Chun-Ying [1 ,2 ]
机构
[1] Dalian Univ Technol, Chem Coll, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China
[3] Shangqiu Normal Univ, Sch Chem & Chem Engn, Shangqiu 476000, Peoples R China
基金
美国国家科学基金会;
关键词
ENHANCED MAGNETIC COOLERS; CRYSTAL-STRUCTURES; AMINO-ACID; LN; FRAMEWORK; GD; DY; CO; PHOSPHONATE; CAGES;
D O I
10.1021/cg400333d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The syntheses, structures, and characterization of three series of one-dimensional (1D) and three-dimensional (3D) 3d-4f duster-based polymers with AA (HGly or HAla) and formate as mixed ligands are described. Under the pH values of 6.0 and 5.2, respectively, three ID undulating chains [Ln = Gd, (1); Tb, (2); and Dy(3)] and two 3D frameworks [Ln = Gd, (4) and Tb, (5)] with a 3-connected pcu-h network were obtained. Both of them use Gly-based heptanuclear trigonal prism [LnCu(6)] clusters and mononuclear Ln(3+) as nodes linked by syn-anti formate ligands. Moreover, three 3D polymers [Ln = Gd, (6); Tb, (7); and Dy (8)] with a 6-connected pcu network were built from Ala-based [Ln(6)Cu(24)] clusters and formate bridges. The formate ligand played an important role not only for the construction of the cluster units but also for their further linkage to extended arrays. Magnetic analyses indicate the three Gd3+-containing compounds bear an interesting magnetocaloric effect, and the -Delta Sm(T) values are 5.8, 6.0, and 18.8 J kg(1-) K-1 (Delta H = 5 T) for 1, 4, and 6, respectively.
引用
收藏
页码:3429 / 3437
页数:9
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