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Magnetic Properties and Photoluminescence of Lanthanide Coordination Polymers Constructed with Conformation-Flexible Cyclohexane-Tetracarboxylate Ligands

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posted on 03.02.2016, 00:00 by Yong-Cong Ou, Xiang Gao, Yue Zhou, Yan-Cong Chen, Long-Fei Wang, Jian-Zhong Wu, Ming-Liang Tong
To investigate the effects on the physical properties of complexes with different conformations of flexible ligands, four lanthanide (Ln) coordination polymers with flexible ligand cyclohexane-1e,2a,4a,5e-tetracarboxylic acid (H4LI), [Ln­(HLII)­(H2O)2]·1.5H2O (Ln = Dy, 1; Tb, 2) and [Ln2(H2LIV)­(LIV)­(H2O)4]·1.5H2O (Ln = Dy, 3; Tb, 4), have been synthesized and characterized. Complexes 1 and 2 are 2D layers composed of LII ligands and [Ln2O2] dinuclear units whereas complexes 3 and 4 are 3D coordination frameworks constructed with LIV ligands and two kinds of dinuclear units, [Ln2O2] and [Ln2(COO)2]. Notably, the conformations of ligands in two structures, which were different and changed from the original LI conformation to LII (e,a,e,e) and LIV (e,e,e,e) conformations, impact the construction of different structures and the magnetic properties. Complex 1 shows antiferromagnetic interactions whereas complex 3 exhibits weak ferromagnetic interactions and slow magnetic relaxation properties. Additionally, the photoluminescence of complexes 2 and 4 have been investigated.