期刊
CHEMICAL SCIENCE
卷 10, 期 43, 页码 10018-10024出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc04043a
关键词
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资金
- National Research Foundation of South Africa
- Stellenbosch University
A molecular-level investigation is reported on breathing behaviour of a metal-organic framework (1) in response to CO2 gas pressure. High-pressure gas adsorption shows a pronounced step corresponding to a gate-opening phase transformation from a closed (1(cp)) to a large-pore (1(lp)) form. A plateau is observed upon desorption corresponding to narrow-pore intermediate form 1(np) which does not occur during adsorption. These events are corroborated by pressure-gradient differential scanning calorimetry and in situ single-crystal X-ray diffraction analysis under controlled CO2 gas pressure. Complete crystallographic characterisation facilitated a rationalisation of each phase transformation in the series 1(cp) -> 1(lp) -> 1(np) -> 1(cp) during adsorption and subsequent desorption. Metropolis grand-canonical Monte Carlo simulations and DFT-PBE-D3 interaction energy calculations strongly underpin this first detailed structural investigation of an intermediate phase encountered upon desorption.
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