Breathing Effect via Solvent Inclusions on the Linker Rotational Dynamics of Functionalized MIL-53.

The breathing effects of functionalized MIL-53-X (X=H, CH , NH , OH, and NO ) induced by the inclusions of water, methanol, acetone, and N,N-dimethylformamide solvents were comprehensively investigated by solid-state NMR spectroscopy. 2D homo-nuclear correlation NMR provided direct experimental evidence for the host-guest interaction between the guest solvents and the MOF frameworks. The variations of the H and C NMR chemical shifts in functionalized MIL-53 from the narrow pore phase transitions to large pore forms due to solvent inclusions were clearly identified.

[Characteristics and Formation Mechanism of Three Haze Pollution Processes in Chengdu in Winter].

Based on the online monitoring data of gaseous pollutants and components in PM from Chengdu super observatory of atmospheric environment, the meteorological factors and component characteristics of three haze pollution process in Chengdu from 2019 to 2020 were analyzed. The CMB model was adopted to simulate the sources and variation trends of PM pollution during the study period, and the causes of each pollution process were analyzed. The results showed that all the three pollution processes occurred under adverse meteorological conditions, where the relative humidity and temperature continued to rise and the wind speed and boundary layer height continued to decrease.

Electrochemical oxidation-induced etherification via C(sp)─H/O─H cross-coupling.

Direct electrochemical construction of C─O bonds through C(sp)─H functionalization still remains fundamentally challenging. Here, electrochemical oxidation-induced benzylic and allylic C(sp)─H etherification has been developed. This protocol not only offers a practical strategy for the construction of C─O bonds using nonsolvent amounts of alcohols but also allows direct electrochemical benzylic and allylic C(sp)─H functionalization in the absence of transition metal catalysis.

[Fine Particulate Matter Source Profile of Typical Industries in Sichuan Province].

An electrical low pressure impactor particle monitor was used to monitor typical industries in Sichuan Province, such as cement, glass, ceramic, brick-tile, coal-fired boiler, biomass boiler, power plant, and steel industry. Fine particulate matter source profiles of each industry were developed based on the laboratory analysis. The results showed that Si, Ca, and Mg were the major elements of building industry particulate matter emission.