Issue 9, 2016

Guest-triggered assembly of zinc(ii) supramolecular isomers with accompanying dimensional change and reversible single-crystal-to-single-crystal transformation

Abstract

Solvent-directed assembly of two-dimensional (2D) and 3D supramolecular isomers as well as guest-exchange induced transformation of the 2D isomer accompanied by photoluminescence switching are reported. Solvothermal reaction of Zn(NO3)2·4H2O, 1,4-bis(4-pyridyl)piperazine (bpp), and benzene-1,3-dicarboxylic acid (H2bdc) in dimethylformamide (DMF) afforded a self-penetrated 3D coordination polymer, {[Zn2(bpp)2(bdc)2]·4DMF·4H2O}n (1), adopting a firewood-like stacking structure. When the above synthetic procedure was repeated employing dimethylacetamide (DMA) as a solvent, a 2D coordination polymer, {[Zn2(bpp)2(bdc)2]·4DMA·6H2O}n (2), was obtained, whose structure shows a crinkled square (4,4) grid type, as a supramolecular isomer of 1. The dimensional difference between isomers 1 and 2 stems mainly from the directional arrangement and the conformation of the bpp ligand. In the guest-exchange experiment, isomer 2 with the crinkled square grid structure not only represents a reversible spreading–folding conversion due to the conformational change of the bpp ligand but also displays a photoluminescence switching behaviour.

Graphical abstract: Guest-triggered assembly of zinc(ii) supramolecular isomers with accompanying dimensional change and reversible single-crystal-to-single-crystal transformation

Supplementary files

Article information

Article type
Paper
Submitted
09 Nov 2015
Accepted
08 Dec 2015
First published
09 Dec 2015

CrystEngComm, 2016,18, 1600-1608

Guest-triggered assembly of zinc(II) supramolecular isomers with accompanying dimensional change and reversible single-crystal-to-single-crystal transformation

H. Ju, I. Park, E. Lee, S. Kim, J. H. Jung, M. Ikeda, Y. Habata and S. S. Lee, CrystEngComm, 2016, 18, 1600 DOI: 10.1039/C5CE02194D

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