Abstract
A six-coordinated 3D metal–organic framework (MOF), namely, [Co(BPDC)(3-bpdb)(H2O)2]n (1) (H2BPDC = 4,4′-biphenyldicarboxylic acid, 3-bpdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene) was purposefully constructed and characterized by single-crystal XRD, IR, elemental analyses, PXRD, SEM, and TGA. Crystal structural analysis revealed that the complex consists of a cds-type three-fold interpenetrated framework. Hirshfeld surface analysis yielded details of the surface characteristics of 1. Significant O−H···O hydrogen bonding interactions, which could promote the stability of the framework, were found is extremely stable in aqueous solution and can resist acids and bases over an extensive pH range of 2–13. 1 shows brilliant fluorescent emission in the solid state and in aqueous solution. Fluorescence titration, cyclic, and anti-interference experiments demonstrated that 1 is an excellent probe for Fe3+, CrO42‒ and Cr2O72‒ in water. The Ksv values of 1 for Fe3+, CrO42‒, and Cr2O72‒, which were as high as 1.06 × 104 M−1, 1.50 × 104 M−1, and 1.16 × 104 M−1, respectively, were comparable with those of other sensors. The quenching mechanism of the novel probe was subsequently explained.Graphic Abstract
Highlights
Recent developments in society and significant improvements in living standards have brought increased attention to the state of the environment and its relation to human health
Inorganic metal oxide semiconductor-based photocatalysts play a key role in the photocatalytic treatment of water pollution [10], and photocatalytic nanostructured semiconducting thin films can be used for the photodegradation of toxic chemicals in the environment [11]
Co1 is located on a crystallographic inversion center and shows a slightly distorted octahedral geometry (Scheme S1)
Summary
Recent developments in society and significant improvements in living standards have brought increased attention to the state of the environment and its relation to human health. Inorganic metal oxide semiconductor-based photocatalysts play a key role in the photocatalytic treatment of water pollution [10], and photocatalytic nanostructured semiconducting thin films can be used for the photodegradation of toxic chemicals in the environment [11]. Fluorescent metal–organic frameworks (MOFs) are excellent functional materials that have been synthesized in large quantities. These frameworks usually have fascinating structures with novel topologies and can be functionally modified. Among the transition metal ions, Co2+ is widely used in the synthesis of MOFs because of its excellent coordination ability and potential function as an electrochemically active center; it is widely abundant and inexpensive. The excellent fluorescent characteristics of 1 demonstrate its potential use as a potential fluorescent probe for detecting Fe3+, CrO42‒, and Cr2O72‒
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