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Issue 15, 2018
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Mercury halide coordination polymers exhibiting reversible structural transformation

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Abstract

Solvothermal reactions of HgX2 salts with the new bis-pyridyl-bis-amide ligand 2,2′-(1,3-phenylene)-bis(N-(pyridin-3-yl)acetamide) (1,3-pbpa) in acetonitrile afforded the complexes [Hg(1,3-pbpa)X2]n (X = Cl, 1; Br, 2; I, 3), while the complexes [Hg(1,3-pbpa)X2·MeCN]n (X = Br, 4; I, 5) were obtained by layering solutions of HgX2 and 1,3-pbpa at room temperature. Complexes 1 and 2 are isostructural one-dimensional (1D) helical chains different from the 1D helical chain 3 in spans, which are 18.0, 18.3 and 29.1 Å, respectively. Upon solvent adoption and removal, complexes 2 and 3 undergo reversible structural transformation into the 1D mesohelical chains 4 and 5 with spans of 29.1 and 29.9 Å, respectively. Pyridyl ring rotation and amide group reorientation are proposed for the structural transformation accompanied by a simultaneous change in luminescence. The structural transformation in 2 and 4 represents a unique example of elastic 1D helical chains that show stretching during the process. The roles of halide anions in the structural changes and the luminescence properties of 1–5 are also discussed.

Graphical abstract: Mercury halide coordination polymers exhibiting reversible structural transformation

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Publication details

The article was received on 19 Jan 2018, accepted on 01 Mar 2018 and first published on 03 Mar 2018


Article type: Paper
DOI: 10.1039/C8CE00086G
Citation: CrystEngComm, 2018,20, 2126-2134
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    Mercury halide coordination polymers exhibiting reversible structural transformation

    P. Mahat Chhetri, X. Yang and J. Chen, CrystEngComm, 2018, 20, 2126
    DOI: 10.1039/C8CE00086G

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