Recent developments in luminescent coordination polymers: Designing strategies, sensing application and theoretical evidences

The design of efficient and economical noble-metal-free bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is needed to fulfil the promise of hydrogen production technologies through overall water splitting. Herein, hierarchical NiCo2O4@CoMoO4 on Ni foam (NF) was synthesized via a facile two-step method which involved hydrothermal and calcination processes. In addition, to explore the mechanism for the growth of hierarchical NiCo2O4@CoMoO4/NF nanostructures, variable time-dependent experiments were carried out. The results showed that the optimal NiCo2O4@CoMoO4/NF-7 electrode exhibits superior electrocatalytic performance and excellent durability for OER, HER and overall water splitting, which presents a low overpotential of 265 mV at a current density of 20 mA cm−2 for OER and 121 mV at a current density of 10 mA cm−2 for HER in 1.0 M KOH. Meanwhile, when used as an electrocatalyst electrode for overall water splitting, NiCo2O4@CoMoO4/NF-7 shows a quite low cell voltage of 1.55 V at 10 mA cm−2, and long-term durability during a 12 h stability test at a current density of 10 mA cm−2 in 1.0 M KOH. The study demonstrates that synergistic effects between NiCo2O4 and CoMoO4 in NiCo2O4@CoMoO4/NF heterostructures can effectively enhance electrochemical performance and provides a wide range of possibilities for the further development of inexpensive electrode materials for overall water splitting.

Hierarchical heterostructure NiCo2O4@CoMoO4/NF as an efficient bifunctional electrocatalyst for overall water splitting

Effective detection of organic/inorganic pollutants, such as antibiotics, nitro-compounds, excessive Fe3+ and MnO4 - , is crucial for human health and environmental protection. Here, a new terbium(III)-organic framework, namely [Tb(TATAB)(H2 O)]⋅2H2 O (Tb-MOF, H3 TATAB=4,4',4''-s-triazine-1,3,5-triyltri-m-aminobenzoic acid), was assembled and characterized. The Tb-MOF exhibits a water-stable 3D bnn framework. Due to the existence of competitive absorption, Tb-MOF has a high selectivity for detecting Fe3+ , MnO4 - , 4-nirophenol and nitroimidazole (ronidazole, metronidazole, dimetridazole, ornidazole) in aqueous through luminescent quenching. The results suggest that Tb-MOF is a simple and reliable reagent with multiple sensor responses in practical applications. To the best of our knowledge, this work represents the first TbIII -based MOF as an efficient fluorescent sensor for detecting metal ions, inorganic anions, nitro-compounds, and antibiotics simultaneously.

A Water-Stable Terbium(III)-Organic Framework as a Chemosensor for Inorganic Ions, Nitro-Containing Compounds and Antibiotics in Aqueous Solutions.

The highly porous luminescent metal–organic frameworks (MOFs) can act as fluorescent probes for the detection of nitro compounds and can also serve as containers and energy transfer platforms to co...

Tetraphenylethylene-Decorated Metal-Organic Frameworks as Energy-Transfer Platform for the Detection of Nitro-Antibiotics and White-Light Emission.

A cobalt(II) coordination polymer with an unusual 4,4,4-connected network was hydrothermally synthesized and observed with high thermal, solvent, and pH stabilities. This polymer can serve as the first dual-responsive fluorescent chemosensor for the selective detection of acetylacetone and Cr2O72- ion (pH 3.0) in aqueous systems.

Cobalt(II)-Based 3D Coordination Polymer with Unusual 4,4,4-Connected Topology as a Dual-Responsive Fluorescent Chemosensor for Acetylacetone and Cr2O72.

Three isostructural metal–organic frameworks denoted as Zn(L)(aip)·(H2O) (1), Zn(L)(ip)·(DMF)(H2O)1.5 (2), and Zn(L)(HBTC)·(H2O)2 (3) with functional groups –NH2, –H and –COOH, respectively, decorated on the 1D channels have been rationally designed with the purpose of exploring the influence of electron transfer from organic ligands in the 1D channels on the sensing of nitro explosives and antibiotics. These three compounds exhibit strong fluorescence in water, and they can be applied to detect the presence of explosives or antibiotics by means of fluorescence quenching in aqueous solution, whereas in terms of special explosives or antibiotics at the same concentration, 3 demonstrates a more superior quenching efficiency than 1 and 2. More importantly, it has been found that the difference in the sensing performances of these compounds is closely related to the interaction between the functional groups and guest molecules via electron and energy transfer from MOFs to explosives and antibiotics.

Engineering design toward exploring the functional group substitution in 1D channels of Zn–organic frameworks upon nitro explosives and antibiotics detection

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Engineering design toward exploring the functional group substitution in 1D channels of Zn–organic frameworks upon nitro explosives and antibiotics detection