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Issue 20, 2020
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Temperature-induced structural transformations accompanied by changes in magnetic properties of two copper coordination polymers

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Abstract

The self-assembly reactions of 5-aminodiacetic isophthalic acid (H4adip) ligands and Cu2+ ions at different temperatures to produce two one-dimensional (1D) coordination polymers (CPs), {[Cu(H2adip)(H2O)]·5H2O}n (1) and [Cu2(adip)(H2O)3]n (2) are reported. The structures and chemical compositions of both CPs were characterized by using single-crystal X-ray diffraction and other methods. Structural analyses revealed that CP 1 crystallized in the monoclinic C2/c space group, and two crystallographically independent Cu2+ ions were interconnected by H4adip ligands to give a 1D zigzag chain. However, CP 2 belonged to the triclinic P-[1 with combining macron] space group, and two types of Cu2+ ions were linked through carboxylate groups to generate dinuclear units, which were bridged by H4adip ligands to give a 1D double chain. Moreover, the adjacent chains in both 1 and 2 could be further stacked to form 3D supramolecular architectures through hydrogen bonds. Interestingly, the block crystal 1 can undergo structural transformation to form the sheet crystal 2 when 1 was heated and kept at 80 °C for 12 h, which represents a rare example of structural transformation resulting from the coordination modes of organic ligands triggered by temperature. Both CPs 1 and 2 exhibited ferromagnetic coupling interactions between Cu2+ ions, and the magnetic results also supported the presence of structural transformation processes.

Graphical abstract: Temperature-induced structural transformations accompanied by changes in magnetic properties of two copper coordination polymers

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Supplementary files

Article information


Submitted
14 Mar 2020
Accepted
17 Apr 2020
First published
20 Apr 2020

CrystEngComm, 2020,22, 3482-3488
Article type
Paper

Temperature-induced structural transformations accompanied by changes in magnetic properties of two copper coordination polymers

J. Tu, H. Chen, H. Tian, X. Yu, B. Zheng, S. Zhang and P. Ma, CrystEngComm, 2020, 22, 3482
DOI: 10.1039/D0CE00391C

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