Luminescent spherical particles of lanthanide-based infinite coordination polymers with tailorable sizes
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2020-04-14
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Arroyos, Guilherme [UNESP]
Frem, Regina C. G. [UNESP]
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Infinite coordination polymers (ICPs) are compounds usually obtained as spherical particles exhibiting amorphous phases in powder X-ray diffraction patterns. In the present work, we report an ICP system based on rare-earth ions with pyrazole-3,5-dicarboxylate as a linker and malonate as a coordination modulator. The compounds exhibit a 2D MOF structure. Three different synthetic routes were used, namely microwave-assisted, solvothermal and gel diffusion. The syntheses yield single-phase spherical particles, which were characterized by PXRD, 1H NMR, CHN, FTIR, TGA, SEM and TEM. Photoluminescence spectroscopy was carried out to study the luminescence properties of the Eu3+ and Tb3+-based samples. With the different-sized particles obtained, we could elucidate the intricate microstructure of the spheres and propose a reason behind the observed amorphous phases in the PXRD patterns.
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CrystEngComm, v. 22, n. 14, p. 2439-2446, 2020.