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Issue 11, 2019
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Unprecedented homochiral 3D lanthanide coordination polymers with triple-stranded helical architecture constructed from a rigid achiral aryldicarboxylate ligand

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Abstract

Eight homochiral lanthanide coordination polymers, namely [Ln2L3(H2O)2]n·4nH2O [Ln = Sm (1); Eu (2); Gd (3); Tb (4); Dy (5); Ho (6); Er (7); Yb (8)], based on an achiral rigid ligand, 5-[(pyridin-4-ylmethyl)amino]-isophthalic acid (H2L), have been hydrothermally prepared and characterized by single X-ray diffraction, elemental analysis, infrared spectroscopy, thermogravimetric analysis, powder X-ray diffraction, and circular dichroism spectroscopy. Compounds 1–8 featured three-dimensional frameworks with triple-stranded helical chains, exhibiting a topological structure with the Schläfli symbol {45·6·104}{45·6}. Solid-state circular dichroism (CD) spectroscopy revealed the occurrence of spontaneous chiral symmetry breaking during crystallization and that the origin of chirality might be the helicity. Furthermore, luminescence and second harmonic generation (SHG) activity have been studied. Compound 5 showed SHG activity. Compounds 1, 2 and 4 displayed characteristic luminescence stemming from the trivalent lanthanides.

Graphical abstract: Unprecedented homochiral 3D lanthanide coordination polymers with triple-stranded helical architecture constructed from a rigid achiral aryldicarboxylate ligand

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Publication details

The article was received on 26 Jul 2018, accepted on 08 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8CE01242C
Citation: CrystEngComm, 2019,21, 1758-1763

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    Unprecedented homochiral 3D lanthanide coordination polymers with triple-stranded helical architecture constructed from a rigid achiral aryldicarboxylate ligand

    L. You, S. Xie, C. Xia, S. Wang, G. Xiong, Y. He, I. Dragutan, V. Dragutan, V. P. Fedin and Y. Sun, CrystEngComm, 2019, 21, 1758
    DOI: 10.1039/C8CE01242C

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