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revised on 03.02.2020 and posted on 06.02.2020by Arturo Gamonal, Chen Sun, A. Lorenzo Mariano, Estefania Fernandez-Bartolome, Elena SanVicente, Bess Vlaisavljevich, Javier Castells-Gil, Carlos Martí-Gastaldo, Roberta Poloni, Reinhold Wannemacher, Juan Cabanillas-Gonzalez, José Sanchez Costa
A novel gas sensing mechanism exploiting the luminescence modulation upon NO2 adsorption is here demonstrated. Two isostructural lanthanide based-metal-organic frameworks are used including a recognition center (aminogroup) that provides high selectivity for NO2 molecules. Energy transfer from the organic ligands to Ln is strongly dependent on the presence of NO2, resulting in an unprecedented photoluminescent sensing scheme. Thereby, NO2 exposition triggers either a reversible enhancement or a decrease of the luminescence intensity, depending on the lanthanide ion (Eu or Tb). Our experimental studies combined with DFT and complete active space self-consistent field calculations, provide understanding of the nature and effects of NO2 interactions within the MOFs and the signal transduction mechanism.