Ultrasmall metal nanoparticles (NPs) show high catalytic activity in heterogeneous catalysis but are prone to reunion and loss during the catalytic process, resulting in low chemoselectivity and poor efficiency. Herein, a locking effect strategy is proposed to synthesize high-loading and ultrafine metal NPs in metal−organic frameworks (MOFs) for efficient chemoselective catalysis with high stability. Briefly, the MOF ZIF-90 with aldehyde groups cooperating with diamine chains via aldimine condensation was interlocked, which was employed to confine in situ formation of Au NPs,

How to transfer industrial exhaust gases of nitrogen oxides into high‐values product is significantly important and challenging. Herein, we demonstrate an innovative method for artificial synthesis of essential α‐amino acids from nitric oxide (NO) by reacting with α‐keto acids through electrocatalytic process with atomically dispersed Fe supported on N‐doped carbon matrix (AD‐Fe/NC) as the catalyst. A yield of valine with 32.1 μmol mgcat−1 is delivered at −0.6 V vs. reversible hydrogen electrode, corresponding a selectivity of 11.3 %. In situ X‐ray absorption fine structure and synchrotron radiation infrared spectroscopy analyses show that NO as nitrogen source converted to hydroxylamine that promptly nucleophilic attacked on the electrophilic carbon center of α‐keto acid to form oxime and subsequent reductive hydrogenation occurred on the way to amino acid. Over 6 kinds of α‐amino acids have been successfully synthesized and gaseous nitrogen source can be also replaced by liquid nitrogen source (NO3−). Our findings not only provide a creative method for converting nitrogen oxides into high‐valued products, which is of epoch‐making significance towards artificial synthesis of amino acids, but also benefit in deploying near‐zero‐emission technologies for global environmental and economic development.

Developing nonprecious electrocatalysts toward oxygen evolution reaction (OER) remains one of the main challenges for large-scale electrocatalytic water splitting. Metal−organic gels (MOGs) have recently emerged as a promosing nonprecious electrocatalyst...

The conversion of industrial exhaust gases of nitrogen oxides into high-value products is significantly meaningful for global environment and human health. And green synthesis of amino acids is vital for biomedical research and sustainable development of mankind. Herein, we demonstrate an innovative approach for converting nitric oxide (NO) to a series of αamino acids (over 13 kinds) through electrosynthesis with α-keto acids over self-standing carbon fiber membrane with CoFe alloy. The essential leucine exhibits a high yield of 115.4 μmol h À 1 corresponding a Faradaic efficiency of 32.4 %, and gram yield of products can be obtained within 24 hours in lab as well as an ultra-long stability (> 240 h) of the membrane catalyst, which could convert NO into NH 2 OH rapidly attacking α-keto acid and subsequent hydrogenation to form amino acid. In addition, this method is also suitable for other nitrogen sources including gaseous NO 2 or liquidus NO 3 À and NO 2 À . Therefore, this work not only presents promising prospects for converting nitrogen oxides from exhaust gas and nitrate-laden waste water into high-value products, but also has significant implications for synthetizing amino acids in biomedical and catalytic science.

Porphyrin-based imine gels assembled from small molecular precursors are stable and active for visible-light driven hydrogen production.

Metal–organic gels assembled from HKUST‐1 nanoparticles have been developed. The HKUST‐1 gels with varying molar ratios of the chemical constituents exhibit diverse multistimuli‐responsive behaviors towards environmental temperature and mechanical stimuli. A reversible phase transition between gel and colloidal suspensions can be achieved for the gel with a metal/ligand molar ratio of 1.2:1. The chemical and morphological structures of the supramolecular gels were investigated through a combination of electron microscopy, X‐ray analysis techniques, and optical spectroscopy. A continuous morphology evolution was confirmed to exist for a gradual decrease of the molar ratio between the metal and the ligand. The changes to the morphological structure also result in different gas adsorption and rheology properties for the HKUST‐1‐based gels.

A strategy for the development of visible-light-sensitive organic cage structures is reported. Enantiomeric imine cages with optical and electrochemical properties are developed employing perylene diimide (PDI) and tetraphenylethene subunits using dynamic covalent imine chemistry. Polycyclic aromatic hydrocarbons are encapsulated efficiently in the imine cage, and the guests interact with PDI units via supramolecular π-π interactions. Visible-light-driven Smiles rearrangement of 2aryloxybenzoic acids to aryl salicylates is achieved with high efficiency in the presence of the imine cage as the catalyst.

Gold nanoparticles confined in imidazolium-based porous organic polymers show high activity in a microfluidic reactor.