Recent Advances in C_(2) Gases Separation and Purification by Metal-Organic Frameworks

Separation of C_(2) gases(C_(2)H_(2)/C_(2)H_(4),C_(2)H_(6)/C_(2)H_(4) and C_(2)H_(2)/CO_(2))mixtures is one of the most important and energy-demanding processes in chemical industry.Traditional separation methods(fine distillation separation and selective catalytic hydrogenation separation)have the shortages of high energy consumption and inefficient use of resources,affecting the achievement of peak carbon dioxide emissions and carbon neutrality targets.Separation based on adsorption is considered as one of the best ways to achieve low-energy separations.Therefore,it is of great importance to synthesize materials that enable the effective separation and purification of C_(2) gases under mild conditions.As an emerging class of porous materials,metal-organic frameworks(MOFs)show great promise in the field of gas separation and purification due to their ultra-high specific surface area,easily modifiable pore surfaces,structural designability and functionalization.Herein,we summarize recent research advances by use of MOFs sorbents for the separation and purification of C_(2) gases,including C_(2)H_(2)/C_(2)H_(4),C_(2)H_(6)/C_(2)H_(4) and C_(2)H_(2)/CO_(2).Relationship between structures and separation mechanism is also explored.Furthermore,challenges and possible research directions related to the further exploration are also discussed.

Recent Progress in Covalent Organic Frameworks(COFs) for Electrocatalysis

Electrocatalysis provides various technologies for energy storage and conversion,which is an important part of realizing sustainable clean energy for the future.COFs,as emerging porous crystalline polymers,possess high specific surface areas,tunable pore structures,high crystallinity and tailorable functionalization.These features endow COFs with abundant active sites and fast electron transport channels,making them potentially efficient electrocatalysts.In recent years,COF-based electrocatalysts have been widely developed for hydrogen evolution reaction(HER),hydrogen oxidation reaction(HOR),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),nitrogen reduction reaction(NRR)and carbon dioxide reduction reaction(CO_(2)RR).In this review,design strategies of COF-based electrocatalysts are briefly summarized,including applying COF as supports,introducing active metals in COF,constructing two-dimensional conductive COF,formation of COF-based hybrid and pyrolysis of COF to obtain carbon materials.Then,the recent research progress in COF-derived catalysts for specific electrocatalytic reactions is introduced systematically.Finally,the outlook and challenges of future applications of COFs in electrocatalysis are highlighted.

Newπ-conjugated cyanostilbene derivatives:Synthesis,characterization and aggregation-induced emission

Two novel Jr-conjugated cyanostilbene derivatives, FLU-CNPH and TPE-CNPH, were designed aria synthesized by introducing the strong electron donor 1, 4-dihydropyrro[3,2-b]indole and AIE electron donor tetraphenylethylene （TPE） to the （3＇,5＇-bis（trifluoromethyl）-biphenyl-4-yl）-acetonitrile, respec- tively, Both of them were fully characterized and their AIE behaviors were investigated using fluorescence spectroscopy and FE-SEM images. Their optimized structures and frontier molecular orbitals were calculated with the DFT by using Materials Studio 7,0 software to study the relationship between the structure and properties.