Metal-organic frameworks (MOFs) are a class of well-ordered hybrid organic-inorganic porous crystalline materials arising from reticulation of metal ions and organic ligands. Because of the versatile skeletons and pores, MOFs offer numerous possibilities for interplay with electrons, photons, excitons, and spins, making them appealing for various device applications. Until now, lots of devices focus on polycrystalline MOF materials, while single-crystal MOFs could enable the potential of higher carrier transport and device stability rather than their polycrystalline counterparts because of the low defect concentrations and extra single-crystal features. Nevertheless, the synthesis of single-crystal MOFs and morphology control are challenging. This perspective provides a brief overview of single-crystal MOF devices and presents some unexplored opportunities for applying single-crystal MOFs to electronic and opto-electronic devices. Key challenges must be solved to realize single-crystal MOF device applications. 

Single-crystal metal-organic frameworks for electronic and opto-electronic devices

Boosting C2H6/C2H4 separation via the precise electrostatic modulation of synthetic 1-D channel at atomic level

A 3D Co(III)-complex hybrid polyoxoniobate framework Na10(H2O)36[Co2(phen)2(4,4'-bipy)(Nb6O19)2]·19H2O (1) has been constructed from [Co2(phen)2(4,4'-bipy)(Nb6O19)2]10- dimer units and 2D inorganic Na-O cluster layers. The Co(III) centers are coordinated with {Nb6O19}, 4,4'-bipy and phen simultaneously. The [Co2(phen)2(4,4'-bipy)(Nb6O19)2]10- fragments link the Na-O cluster layers to generate a 3D metal complex-modified hybrid polyoxoniobate framework with π-π interactions between phenanthroline rings. Compound 1 shows reversible thermochromic behavior resulting from electron transfer from {Nb6O19} to 4,4'-bipy and subsequent formation of radical products, which is first observed in polyoxoniobates. Furthermore, the compound exhibits stable nonvolatile storage behavior and rewritable resistive switching with a low switching voltage (1.12 V) and high current on/off ratio (1.18 × 103) along with stable cyclic performance during stability test for 200 cycles. Charge-transfer mechanism has been studied by analyzing the relationship between current and voltage in the process of resistance switching.

Reversible Thermochromism and Stable Resistance Switching Behaviors Based on a Co(III)-Complex-Linked Polyoxoniobate.

Designing and synthesizing hollow frame structures with unique three-dimensional open structures in electrocatalysis remain a challenge. Etching is an effective method to synthesize metal-organic frameworks (MOFs) with a hollow structure and rich function. Herein, we report the design and synthesis of Hf-doped CoP hollow nanocubes by selective etching and ion exchange. Different from the traditional etching method, we used acid xylenol orange solution to etch typically the (211) crystal face of ZIF-67, obtaining the unique bell-like structure, named XO-ZIF-67. Subsequently, Hf-doped CoP hollow nanocubes were formed by Hf 

Hf-Doped CoP Hollow Nanocubes as High-Performance Electrocatalyst for Oxygen Evolution Reaction

Employing the spin-orbit coupling effect by introducing halogen substituents is an excellent strategy to tune the magnetic behavior of organic or metal-organic materials. Light is an alternative tool to modulate the magnetic behavior of a material through a photoinduced electron transfer process, without changing its chemical identity. In this work, three halogen containing 1,4-bis(4,5-diphenyl-1 

Light-Induced Antiferromagnetic to Ferromagnetic Transition in Halogen Substituted 1,4-Bis(imidazolyl)benzene Systems: An Effect of Spin–Orbit Coupling and π-Stacking in Enhanced Photomagnetism

Stimulus-responsive hydrogen-bonded organic frameworks (HOFs) can respond to specific physical or chemical stimuli by exhibiting reversible changes in structure, conductivity, color and luminescence, along with the inherent characteristics of HOFs such as simple composition, flexibility and metal-free, which together contribute to the widespread application of stimulus-responsive HOF materials in photoconductivity, chromism, fluorescence sensing, drug delivery, gas adsorption and separation. This review provides a summary of the construction strategies for stimulus-responsive HOFs, categorically reviews various stimulus-responsive HOFs based on different stimuli for the first time, briefly elucidates their applications across various fields, and concludes by emphasizing their advantages and the challenges they face. 

Stimulus-responsive hydrogen-bonded organic frameworks: Construction strategies, research progress and applications

Porous materials have shown great promise in the development of cost- and energy-efficient separation processes, particularly for the challenging industrial purification of ethylene from an ethylene/ethane mixture. This review has summarized the latest development in metal–organic frameworks (MOFs) and hydrogen-bonded organic frameworks (HOFs) for C2H4/C2H6 separation, including the strategies to improve adsorption capacity and separation selectivity, as well as their efficient separation of gas mixtures in various practical environments. The separation mechanism of C2H4/C2H6 in different adsorbents has also been highlighted, along with the discussion on various adsorbents' challenges and future developments. 

Crystalline porous materials as a versatile platform for C2H4/C2H6 separation

Electrical bistability based on metal-organic frameworks.

Preparation and applications of Hydrogen-Bonded organic framework membranes

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Stimulus-responsive hydrogen-bonded organic frameworks: Construction strategies, research progress and applications

Crystalline porous materials as a versatile platform for C2H4/C2H6 separation

Electrical bistability based on metal-organic frameworks.

Preparation and applications of Hydrogen-Bonded organic framework membranes