MOF-Based Materials with Sensing Potential: Pyrrolidine-Fused Chlorin at UiO-66(Hf) for Enhanced NO<sub>2</sub> Detection
Carla Queirós,
Francisco G. Moscoso,
José Almeida,
Ana M. G. Silva,
Ahmad Sousaraei,
Juan Cabanillas-González,
Manuela Ribeiro Carrott,
Tânia Lopes-Costa,
José M. Pedrosa,
Luís Cunha-Silva
Affiliations
Carla Queirós
LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
Francisco G. Moscoso
Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. Utrera Km. 1, 41013 Sevilla, Spain
José Almeida
LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
Ana M. G. Silva
LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
Ahmad Sousaraei
Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Universitaria de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
Juan Cabanillas-González
Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Universitaria de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
Manuela Ribeiro Carrott
LAQV-REQUIMTE, Institute for Research and Advanced Studies, Department of Chemistry and Biochemistry, School of Sciences and Technology, University of Évora, 7000-671 Évora, Portugal
Tânia Lopes-Costa
Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. Utrera Km. 1, 41013 Sevilla, Spain
José M. Pedrosa
Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. Utrera Km. 1, 41013 Sevilla, Spain
Luís Cunha-Silva
LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
An efficient strategy to develop porous materials with potential for NO2 sensing was based in the preparation of a metal-organic framework (MOF), UiO-66(Hf), modified with a very small amount of meso-tetrakis(4-carboxyphenyl) N-methylpyrrolidine-fused chlorin (TCPC), TCPC@MOF. Chlorin’s incorporation into the UiO-66(Hf) framework was verified by several characterization methods and revealed that the as-synthesized TCPC@MOF brings together the chemical stability of UiO-66(Hf) and the photophysical properties of the pyrrolidine-fused chlorin which is about five times more emissive than the porphyrin counterpart. TCPC@MOF was further incorporated into polydimethylsiloxane (PDMS) and the resulting TCPC@MOF@PDMS film was tested in NO2 gas sensing. It showed notable sensitivity as well as a fast response in the range between 0.5 and 500 ppm where an emission intensity quenching is observed up to 96% for 500 ppm. This is a rare example of a chlorin-derivative used for gas-sensing applications through emission changes, and an unusual case of this type of optical-sensing composites of NO2.
