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Seven uncommon Ln-pyrazoyl-carboxyl metal−organic framework (MOF) systems have been fabricated by a pyrazoyl-carboxyl bridging ligand, in which the Eu-MOF reveals excellent luminescent sensing for Fe3+ and Cr2O72− ions and remarkably selective capture for CO2 due to the multiple CO2-philic sites as confirmed by Grand Canonical Monte Carlo (GCMC) simulations.
Seven new isostructural lanthanide metal–organic frameworks (Ln-MOFs), [Ln(Hpzbc)2(NO3)]·H2O (1-Ln, Ln = Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Er3+, and Yb3+ ions, H2pzbc = 3-(1H-pyrazol-3-yl) benzoic acid), with one-dimensional (1D) channels decorated by nitrate anions and pyrazoyl groups have been constructed. 1-Ln, as revealed by structural analysis, represent uncommon microporous 3D Ln-pyrazoyl-carboxyl systems using pyrazoyl-carboxyl bifunctional ligands as bridges. The luminescent investigations show that 1-Eu is an excellent MOF-based fluorescent probe, with high sensitivity, selectivity, and simple regeneration, for environmentally relevant Fe3+ and Cr2O72– ions. 1-Eu also presents highly selective capture for CO2 over N2 and CH4 due to the multiple binding sites for CO2 molecules, which were supported by Grand Canonical Monte Carlo (GCMC) simulations.
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