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Self-assembly of new M(II) coordination polymers based on asymmetric 1,3,4-oxadiazole-containing ligands: effect of counterions and magnetic property

Abstract

Two new unsymmetrical ligands 2-(pyridin-3-yl)-5-(quinolin-2-yl)-1,3,4-oxadiazole (L1) and 2-(pyridin-4-yl)-5-(quinolin-2-yl)-1,3,4-oxadiazole (L2) have been synthesized and their self-assembly reactions with MII(NO3)2 (M = Cd, Zn and Cu) and MII(ClO4)2 (M = Cd and Cu) have been investigated for rational construction of porous coordination polymers. It was found that counter-anion plays an important role in the structural assemblies. The strongly coordinating NO3– anions resulted in the formation of one-dimensional (1D) polymers (1-3 and 6). Weakly coordinating ClO4– anion gave rise to two-dimensional (2D) and three-dimensional (3D) porous coordination polymers (4 and 5). In polymers 1-3 and 6, the quinoline units play a critical role in the formation of a π–π stacking system, which further expands the dimensionality from one to three. Polymers 4 and 5 possess 1D rhombic and hexagonal channels, respectively. This study demonstrates that the asymmetric molecules L1 and L2 containing monodentate and bidentate chelating binding sites can be a very useful type of organic ligands to construct porous 2D- and 3D- cation frameworks. Although ab initio prediction of a particular superstructure from the starting materials and synthetic condition is still impossible, some general principles are applicable for the observed structures and synthetic conditions. The photoluminescence of 1, 2, 4 and 6, and the magnetic properties of 3 and 5 are also studied.

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Publication details

The article was received on 28 Jul 2017, accepted on 25 Aug 2017 and first published on 25 Aug 2017


Article type: Paper
DOI: 10.1039/C7CE01379E
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Self-assembly of new M(II) coordination polymers based on asymmetric 1,3,4-oxadiazole-containing ligands: effect of counterions and magnetic property

    X. Wu, F. Pan, D. Zhang, G. Jin and J. Ma, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01379E

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