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Issue 5, 2018
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Temperature-induced self-assembly of two kinds Zn(II)-based coordination polymers with luminescence properties for application in sensing and adsorption

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Abstract

Temperature-induced self-assembly of coordination polymers (CPs) is of great importance for structural tunability and is quite necessary for further research on structure–property relationships. Two types of CPs {[Zn(L)(DMF)]·3DMF}n (1) (H2L = 4,4′-(trans-cyclohexane-1,2 diyl)bis(azanediyl)bis(carbonyl)dibenzoic acid, DMF = N,N-dimethylformamide) and {ZnL}n (2) are synthesised by the reaction of Zn(NO3)2·6H2O with H2L at different reaction temperatures. CP 1 with a one-dimensional structure is obtained at room temperature, 35 °C and 45 °C. CP 2 with a two-dimensional structure is prepared by heating at 75 °C. When the temperature is further increased to 85 °C, 95 °C, 105 °C and 120 °C, CP 2 could still be obtained. Considering the decomposition of ligands and carbonization of solvents at high temperature, 120 °C is chosen as the temperature endpoint in the experiment. Single crystal X-ray diffraction analysis indicates that 1 has a chain structure formed by binuclear metal clusters and a bridged carboxylate group. It also indicates that 2 shows a layered structure formed through intermolecular interactions between two adjacent chain motifs. The luminescence properties of 1 and 2 are explored at room temperature in the solid-state. The luminescence intensities of 1 and 2 are weak due to the N–H vibration of the ligand. In order to improve their luminescence properties, we attempt to introduce lanthanide(III) ions into their channels. Only 2 can accept lanthanide ions Eu3+ and Tb3+ and still maintain its framework, as confirmed by PXRD. Besides, 2 can also sensitize them well. Therefore, the luminescence properties of 2 are improved vastly. The doped material can emit bright red and green light of Eu3+ and Tb3+. A series of EuxTb(1−x)@ZnL coordination polymers are prepared using a post-synthesis method to realize white light emission. The luminescent material Tb3+@ZnL shows a highly sensitive quenching effect to acetone among common solvents. The characteristic emission of Tb3+ could be quenched in the presence of 8 vol% acetone. In addition, 2 could selectively adsorb methylene blue (MB) due to its porosity and can act as a green adsorbent. Compared to 1, 2 is a promising multifunctional material for applications in photoluminescence, luminescent detection and dye adsorption.

Graphical abstract: Temperature-induced self-assembly of two kinds Zn(ii)-based coordination polymers with luminescence properties for application in sensing and adsorption

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Publication details

The article was received on 30 Nov 2017, accepted on 20 Jan 2018 and first published on 22 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04698G
Citation: New J. Chem., 2018,42, 3885-3891
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    Temperature-induced self-assembly of two kinds Zn(II)-based coordination polymers with luminescence properties for application in sensing and adsorption

    Y. Liu, W. Liu, C. Xu, W. Dou, Z. Ju and W. Liu, New J. Chem., 2018, 42, 3885
    DOI: 10.1039/C7NJ04698G

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