Fluorescence detection of Mn2+, Cr2O72− and nitroexplosives and photocatalytic degradation of methyl violet and rhodamine B based on two stable metal–organic frameworks

Abstract

The reaction of Zn(NO₃)₂·6H₂O/Cd(NO₃)₂·4H₂O with a semi-flexible ligand 4′-(4-(3,5-dicarboxylphenoxy)phenyl)-4,2′:6′,4′′-terpyridine (H₂dbp) gave two new metal–organic frameworks of [Zn(dbp)]_n (1) and [Cd(dbp)(H₂O)·2H₂O·CH₃CN]_n (2). Single crystal X-ray diffraction analyses reveal that both 1 and 2 show three-dimensional, two-fold interpenetrating four-connected networks with 4⁴.6¹⁰.8 topology. The photoluminescence investigation indicates that both 1 and 2 could be prospective candidates for developing luminescence sensors for the sensing of Mn²⁺, Cr₂O₇²⁻ and nitroaromatic analytes. Furthermore, the photocatalysis properties of 1–2 for the degradation of methyl violet and rhodamine B were examined.