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

Haijun WangHaifei CaoJia-Jia ZhengSimon MathewNobuhiko HosonoBihang ZhouHongliang LyuShinpei KusakaWanqin JinSusumu KitagawaJingui Duan
Published in: Chemistry (Weinheim an der Bergstrasse, Germany) (2018)
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 CO2 /CH4 mixture separation.
Keyphrases
  • density functional theory
  • solid state
  • molecular dynamics simulations
  • electron microscopy