Water-Stable Metal–Organic Frameworks with Selective Sensing on Fe³⁺ and Nitroaromatic Explosives, and Stimuli-Responsive Luminescence on Lanthanide Encapsulation

Abstract

Three water-stable luminescent MOFs [Zn4(bptc)2(NMP)3(DMF)­(H2O)2] n (1-a), [Cd4­(bptc)2­(NMP)3­(DMF)2­(H2O)1] n (1-b), and {[Zn2­(bptc)­(DMA)­(H2O)2]·​(DMA)2·​H2O} n (2), possessing similar chemical components (M2:L1:Sol3) and topology structures, were synthesized by solvents control. Their excellent sensing on iron­(III) cation and nitroaromatic explosives (NACs) with great selectivity, sensitivity and a high K sv (4.54 × 104 for 1-b on PNP) were observed by quenching effects. Furthermore, Zn-MOFs exhibit interesting stimuli-responsive luminescence enhancement after the encapsulation of a series of IIIB cations stimulated different luminescent emitting and intensity enhancement through host–guest processes of the pores in MOFs, especially for two distinct responses of Zn-MOF on a Tb3+ cation.

The crystal structure of poly[(m4-4-bromoisophthalato-κ4 O: O′:O′′:O′′′)zinc(II)], C8H3BrO4Zn

“…Self-assembly of organic ligands and metal anions is widely used to construct complexes with different structures and properties, which facilitated the understanding of structure-property relationships and the fabrication of new molecule-based crystalline complexes. So we may change the conditions of a chemical reaction [11][12][13][14][15] to control the structure of coordination polymers. But adjustment and control of structure is still in an early stage, and successfully prepared samples are still limited.…”

A luminescent Zn-MOF for the detection of explosives and development of fingerprints

“…Therefore, we need very sensitive, selective and cost-effective methods for the detection of nitro compounds at low concentrations. Various techniques are available in the literature for the detection of explosive compounds such as surface plasmon resonance; RDX, 12 colorimetric; TNT, Tetryl, 13 electrochemical; 14 liquid chromatography-mass spectrometry, 15 fluorometry (TNT) 16 and surface-enhanced Raman scattering; (TNT), 17 high-performance liquid chromatography; (TNT, RDX, PETN & HMX), 18,19 etc. Among these reported methods, fluorescence-based detection of explosive compounds is generally preferred due to its quick response, cost-effectiveness, short duration, high selectivity, and easy operation.…”

Silver(I)-Tazobactam Frameworks with Improved Antimicrobial Activity

“…Metal-organic frameworks (MOFs) belong to this family of materials and represent one of the most current advances in coordination chemistry and supramolecular engineering ( Tanaka 2020 ). MOFs are hybrid extended networks derived from inorganic units (as isolated cations, chains, clusters) and organic polydentate ligands, building a flexible family of crystalline compounds with an extraordinary variety of applications in chemical and material sciences ( Rojas et al, 2019 ), including gas storage ( Qasem et al, 2018 ), catalysis ( Hong et al, 2021 ), luminescence ( Huang et al, 2019 ; Liu et al, 2021a ), electrochemistry ( Wen et al, 2012 ; Wang et al, 2020 ), and separation ( Kadioglu and Keskin 2018 ). MOFs with biomedical and pharmaceutical properties have been reported as carriers for the controlled delivery of different active species ( Mileo et al, 2021 ), for cutaneous and cosmetic treatments ( Duan et al, 2021 ), and as contrast agents for magnetic resonance imaging ( Zhang et al, 2018 ; Hu et al, 2021 ), not disregarding the potential biomedical/pharmaceutical applications in cancer ( Zhang et al, 2018 ; Li et al, 2020 ; Liu et al, 2021b ; Liu et al, 2021c ) and antimicrobial ( André et al, 2021 ; Liu et al, 2021d ) therapies.…”