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A layered hydrogen-bonded organic framework (T12-apo) composed of a dehydrotribenzo[12]annulene derivative T12 underwent as many as four states (S-1 to -4) reversibly during an hysteric CO2 sorption process at 195 K. The structural changes observed were due to a degree of freedom between layers, allowing slipping of the layers and an increase in the interlayer distance.
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Hisaki et al. (2018) studied this question.
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