Modulated self-assembly of three flexible Cr(III) PCPs for SO2 adsorption and detection

Valeria B López-Cervantes; Dominic Bara; Ana Yañez-Aulestia; Eva Martínez-Ahumada; Alfredo López-Olvera; Yoarhy A Amador-Sánchez; Diego Solis-Ibarra; Elí Sánchez-González; Ilich A Ibarra; Ross S Forgan

doi:10.1039/d3cc01685d

Modulated self-assembly of three flexible Cr(III) PCPs for SO₂ adsorption and detection

Chem Commun (Camb). 2023 Jun 27;59(52):8115-8118. doi: 10.1039/d3cc01685d.

Affiliations

¹ Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, CU, Del. Coyoacan, 04510, Ciudad de Mexico, Mexico. argel@unam.mx.
² WestCHEM School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK. ross.forgan@glasgow.ac.uk.

Abstract

Modulated self-assembly protocols are used to develop facile, HF-free syntheses of the archetypal flexible PCP, MIL-53(Cr), and novel isoreticular analogues MIL-53(Cr)-Br and MIL-53(Cr)-NO₂. All three PCPs show good SO₂ uptake (298 K, 1 bar) and high chemical stabilities against dry and wet SO₂. Solid-state photoluminescence spectroscopy indicates all three PCPs exhibit turn-off sensing of SO₂, in particular MIL-53(Cr)-Br, which shows a 2.7-fold decrease in emission on exposure to SO₂ at room temperature, indicating potential sensing applications.