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Synthesis Structures, and Properties of Functional 2-D Lanthanide Coordination Polymers [Ln2(dpa)2(C2O4)2(H2O)2]n (dpa = 2,2′-(2-methylbenzimidazolium-1,3-diyl)diacetate, C2O42− = oxalate, Ln = Nd, Eu, Gd, Tb)

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journal contribution
posted on 2010-07-07, 00:00 authored by Xiu-Jian Wang, Zhong-Min Cen, Qing-Ling Ni, Xuan-Feng Jiang, Heng-Chi Lian, Liu-Cheng Gui, Hua-Hong Zuo, Zuo-Yuan Wang
Four two-dimensional frameworks {[Nd(dpa)(C2O4)(H2O)]·(H2O)}n (1), {[Ln2(dpa)2(C2O4)2(H2O)2]·(H2O)}n (Ln = Eu (2), Gd (3), Tb (4)) (dpa = 2,2′-(2-methylbenzimidazolium-1,3-diyl)diacetate, C2O42− = oxalate) have been synthesized under hydrothermal conditions. The networks were generated via formation of sandwich-like dinuclear secondary building blocks of [Ln2(dpa)2(C2O4)(H2O)2] which are linked to each other, resulting in the formation of the subunit of Ln2O2. The variable-temperature magnetic susceptibility studies reveal that complexes 3 and 4 exhibit ferromagnetic interactions, but 2 shows the single Eu3+ ion magnetic behavior. Complexes 2 and 4 show characteristic luminescent properties. The lifetime of 2 is 2.24 ms, but that of 4 is 4.30 ms.