A metal-organic framework with dual fluorescent emission based on 3-aminoisonicotinate: luminescence thermometry and Fe3+ sensing in hybrid membranes

resumo

This work comprises the characterization of a 3D metal-organic framework (MOF), namely, {[Zn(mu-3isoani)2]4H2O}n, synthesized through the coordination of 3-aminoisonicotinic acid (H3isoani) with Zn2+ ions. The assembly of the building blocks resulted in a doubly interpenetrated open 3D crystalline structure with a quartz-like topology that possessed solvent-accessible voids occupied with water molecules. The compound exhibited excellent photoluminescence properties with a dual fluorescent emission arising from the organic molecule as corroborated by calculations using the time-dependent density functional theory (TD-DFT). The independent nature of each emission band with temperature inspired us to study the compound as a ratiometric luminescent thermometer. Notably, it showed the best performance in the 200-300 K range. In addition, the MOF was dispersed in polymethylmethacrylate (PMMA) for the construction of an easy-handled membrane via the solution-casting method for detecting aqueous Fe3+ ions with a competitive KSV value of 3.7 x 103 M-1 and a limit of detection (LOD) of 2.8 x 10-5 M.

palavras-chave

COORDINATION POLYMER; HIGHLY LUMINESCENT; MOF; SENSOR; COMPLEXES; LIGANDS; ZN(II); STATE; BLUE

categoria

Materials Science; Physics

autores

Pajuelo-Corral, O; Alkain, E; Mendes, RF; Paz, FAA; Rodriguez-Diéguez, A; García, JA; Seco, JM; Cepeda, J

nossos autores

agradecimentos

This work was funded by Ministerio de Ciencia, Innovacion y Universidades (MCIN/AEI/https://doi.org/10.13039/501100011033) and the Resilience Funds Next Generation of the European Union (TED2021-132440B-I00), Red Guipuzcoana de Ciencia, Tecnologia e Innovacion (FA385/2023, DG23/16), Gobierno Vasco/Eusko Jaurlaritza (IT1755-22 and IT1500-22), and Junta de Andalucia (FQM-394, B-FQM-734-UGR2 and P21_00386). The authors thank the technical and human support provided by SGIker (UPV/EHU/ERDF, EU). This work was also within the scope of the project CICECO-Aveiro Institute of Materials, (Refs. UIDB/50011/2020, DOI 10.54499/UIDB/50011/2020; UIDP/50011/2020, DOI 10.54499/UIDP/50011/2020; LA/P/0006/2020, DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). RFM gratefully acknowledges FCT for the Junior Research Position (CEECIND/00553/2017).

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