Four 3D “brick-wall”-like metal–organic frameworks with a flexible ligand of (S,S,R,R)-1,2,3,4-cyclopentanetetracarboxylic acid: crystal structures, luminescent and magnetic properties
作者:Lin Cui、Xin-Jun Luan、Cui-Ping Zhang、Yi-Fan Kang、Wen-Tao Zhang、Yao-Yu Wang、Qi-Zhen Shi
DOI:10.1039/c2dt32022c
日期:——
To investigate the conformation of cyclopentanetetracarboxylic acid, four new âbrick-wallâ-like metalâorganic frameworks have been synthesized from hydrothermal reactions with different metal salts, (S,S,R,R)-1,2,3,4-cyclopentanetetracarboxylic acid (H4cptc) and auxiliary N-donor ligands, namely, Cu2(S,S,R,R-cptc)(bpe)(H2O)2·2H2O (1), Co2(S,S,R,R-cptc)(bpe)0.5(H2O)2·2H2O (2), Cd4(S,S,R,R-cptc)2(bpa)2(H2O)5·2H2O (3) and Co2(S,S,R,R-cptc)(bpy)0.5(H2O)2·2(H2O) (4) (bpe = 4-(2-(pyridine-4-yl)vinyl)pyridine, bpa = 4-(2-(pyridine-4-yl)ethyl)pyridine, bpy = 4-(pyridine-4-yl)pyridine). The complexes were further characterized by single-crystal X-ray diffraction, power X-ray diffraction, FT-IR spectra, fluorescent measurements and variable-temperature magnetic susceptibility measurements. The results of the structural investigations show that 1 is a charming (3,3,4)-trinodal architecture, 3 is an interesting trinodal (3,4,5)-connected architecture, and 2 and 4 are isostructural, which are both (4,5)-connected networks. In addition, the magnetic measurements indicate that 2 and 4 show weak antiferromagnetic interactions, and the fluorescent measurement shows the strong solid-state fluorescent emission at room temperature for 3.
为了研究环戊烷四羧酸的构象,我们通过水热反应与不同的金属盐合成了四种新的 "砖墙 "状金属有机框架、(Cu2(S,S,R,R-cptc)(bpe)(H2O)2Â-2H2O (1)、Co2(S,S,R,R-cptc)(bpe)0.5(H2O)2Â-2H2O (2)、Cd4(S,S,R,R-cptc)2(bpa)2(H2O)5Â-2H2O (3)和 Co2(S,S,R,R-cptc)(bpy)0.5(H2O)2Â-2(H2O) (4) (bpe = 4-(2-(吡啶-4-基)乙烯基)吡啶,bpa = 4-(2-(吡啶-4-基)乙基)吡啶,bpy = 4-(吡啶-4-基)吡啶)。通过单晶 X 射线衍射、功率 X 射线衍射、傅立叶变换红外光谱、荧光测量和变温磁感应强度测量对这些复合物进行了进一步表征。结构研究结果表明,1 是一种迷人的(3,3,4)-三叉结构,3 是一种有趣的三叉(3,4,5)-连接结构,2 和 4 是同构结构,都是(4,5)-连接网络。此外,磁性测量结果表明,2 和 4 显示出微弱的反铁磁相互作用;荧光测量结果表明,3 在室温下会发出强烈的固态荧光。