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Crystal structures and properties of four coordination polymers based on a new asymmetric ligand: Tuning structure/dimensionality by various organic solvents

An asymmetric ligand, 4,4?-([2,3?-bipyridine]-4,6-diyl)dibenzoic acid (H2L) was successfully used to construct four new coordination polymers, namely [M(HL)2]n (M?=?Cd(1), Co(2), Zn(3)) and [Ni(L)(H2O)2]n?H2O (4), which were solvothermally synthesized and structurally characterized. In coordination polymers 1?4, two ligands bridge two metal centres through carboxylate oxygen atoms and pyridyl nitrogen atoms to form a rhombic grid motif. Amongst, each rhombic grid connects to adjacent ones through the metal nodes to construct spirolike 1D chain of 1?3 with the partially deprotonated 2-connected HL? ligands, whereas, the completely deprotonated 3- connected L2? ligands make rhombic grids construct 2D network of 4. The various structure/dimensionality of 1?4 essentially originates from the types of organic solvents, because dipolar DMF solvent results in complete deprotonated L2? in 4, conversely, polar NMP and MeCN only cause partial deprotonation of ligand in 1?3. Interestingly, an enhanced luminescence appears in 1 and 3, compared to H2L ligand, while 2 and 4 reveal antiferromagnetic behaviors. Moreover, the sensing experiments indicate that 1 and 3 possess luminescent quenching effects on sensing nitrobenzene. This work provides a promising approach to design and construct new coordination polymers with tunable structure/dimensionality by using different organic solvents.

» Author: Bin Li, Qing-Qing Yan, Guo-Ping Yong

» Publication Date: 01/04/2020

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