Finely Controlled Stepwise Engineering of Pore Environments and Mechanistic Elucidation of Water‐Stable, Flexible 2D Porous Coordination Polymers

Abstract

Two porous coordination polymers (PCPs) with different topologies (NTU-19: sql and NTU-20: dia) underwent finely controlled, stepwise crystal conversions to yield a common water-stable, flexible 2D framework (NTU-22: kgm). The crystal conversions occurred directly at higher temperature via the 3D intermediate (NTU-21: nbo), which could be observed at lower temperature. The successful isolation of the intermediate product of NTU-21, characterization with in situ PXRD and UV/Vis spectra were combined with DFT calculations to allow an understanding of the dynamic processes at the atomic level. Remarkably, breakthrough experiments demonstrate NTU-22 with integral structural properties allowed significant CO /CH mixture separation.

Near-Perfect CO2/CH4 Selectivity Achieved through Reversible Guest Templating in the Flexible Metal–Organic Framework Co(bdp)

“…Adsorbate-induced phase changes typically manifest as steep steps in adsorption isotherms, and these steps can occur at different pressures, depending on the adsorbate. Because of this unique adsorption behavior, flexible metal–organic frameworks have garnered increasing attention as possible gas separation materials . However, while single-component adsorption isotherms for these materials may suggest selectivity for a given gas within a certain pressure range, very few studies have carried out the necessary multicomponent equilibrium adsorption experiments to confirm selectivity and demonstrate that it arises from adsorbate-dependent expansion. ,, Much therefore remains unknown about this separation mechanism in flexible frameworks, such as whether pore opening induced by one molecule will then enable the simultaneous uptake of other molecules.…”

Enhanced Breakthrough Efficiency by a Chemically Stable Porous Coordination Polymer with Optimized Nanochannel

“…We are interested in design and synthesis of functional porous materials for energy gas separation. ,− Herein, a new PCP (NTU-23) with T-shaped ligand and Cu dimers was prepared, as well as its −CH 3 inserted derivative (NTU-24) and −CH 3 shifted analogue (NTU-25) (Scheme ). By integrating the characters of high porosity and good chemical stabilities (2 < pH < 12 at 373 K), NTU-25 has two kinds of alternative pores and −CH 3 modified nanochannel.…”

COF‐Derived N,P Co‐Doped Carbon as a Metal‐Free Catalyst for Highly Efficient Oxygen Reduction Reaction

“…We are interested in the construction of porous carbon materials . Therefore, in continue our work, we developed a N,P co‐doped carbon catalyst via direct carbonization and phosphorization of a 2D COF (Scheme ).…”

“…We are interested in the construction of porous carbon materials. [6,[30][31][32][33][34][35] Therefore, in continue our work, we developed a N,P co-doped carbon catalyst via direct carbonization and phosphorization of a 2D COF (Scheme 1). The COF derived N,P co-doped carbon catalyst exhibits a robust and superior ORR performance with the half-wave potential (0.81 V vs. RHE), high limiting current density (5.7 mA cm À 2 ), low Tafel slope (72 mV decade À 1 ), and methanol tolerance to those of commercial Pt/C.…”