Affiliation:
1. Department of Chemistry and Polymer Science University of Stellenbosch Private Bag X1, Matieland 7602 Stellenbosch South Africa
Abstract
AbstractPore‐shape fixing effects (PSFEs) in soft porous crystals are a relatively unexplored area of materials chemistry. We report the PSFE in the prototypical dynamic van der Waals solid p‐tert‐butylcalix[4]arene (TBC4). Starting with the high‐density guest‐free phase, two porous shape‐fixed phases were programmed using the stimuli of CO2 pressure and temperature. A suite of complementary in situ techniques, including variable‐pressure (VP) single‐crystal X‐ray diffraction, VP powder X‐ray diffraction, VP differential scanning calorimetry, volumetric sorption analysis, and attenuated total reflectance Fourier‐transform infrared spectroscopy was used to track dynamic guest‐induced transformations, providing molecular‐level insight into the PSFE. The interconversion between the two metastable phases is particle size dependent, making this the second example of the PSFE by crystal downsizing, and the first example involving a porous molecular crystal: larger particles undergo reversible transitions while smaller particles remain fixed in the metastable phase. A complete phase interconversion scheme was constructed for the material, thus allowing navigation of the phase interconversion landscape of TBC4 using the easily applied stimuli of CO2 pressure and thermal treatment.
Funder
National Research Foundation
Subject
General Chemistry,Catalysis
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献