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Issue 24, 2020
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Chemical transformation of a luminescent two-dimensional Eu(iii) coordination polymer in the aqueous phase

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Abstract

In this work, the 2D Eu(III) coordination polymer {[Eu(HPDC)(PDC)]}n (PDC = 2,6-pyridinedicarboxylate) (1) was prepared in a fast manner via microwave-assisted hydrothermal synthesis. The same compound was obtained by a conventional hydrothermal route and had its structure determined through single crystal X-ray diffraction. In 1, the HPDC and PDC ligands exhibit terminal and chelating bridging modes, respectively, forming a coordination polymer through interconnected europium–carboxylate chains, leading to a highly ordered two-dimensional layer. The nanosheets in 1 self-organize in the solid-state by intermolecular interactions, producing a 3D supramolecular network. Solid-state photoluminescence studies have shown that the antenna effect is responsible for the red emission of the compound under ultraviolet excitation. In alcoholic solutions, it was possible to exfoliate the material by ultrasonication in a top-down approach, leading to single nanosheets of 1. In the chemical stability studies, there was observed a water-induced transformation of 1, leading to the compound {[Eu(PDC)(HPDC)(H2O)2]·4H2O}n (2). The aqueous suspension of this material shows strong red luminescence with the naked-eye. 2 demonstrates reversible behavior induced by heating under reduced pressure. Our work highlights the properties related to solvent-induced exfoliation and water-induced transformation.

Graphical abstract: Chemical transformation of a luminescent two-dimensional Eu(iii) coordination polymer in the aqueous phase

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Supplementary files

Article information


Submitted
06 Dec 2019
Accepted
04 Apr 2020
First published
06 Apr 2020

New J. Chem., 2020,44, 10146-10152
Article type
Paper

Chemical transformation of a luminescent two-dimensional Eu(III) coordination polymer in the aqueous phase

C. M. da Silva, J. Ellena and R. C. G. Frem, New J. Chem., 2020, 44, 10146
DOI: 10.1039/C9NJ06075H

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