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CO2 is included: The one-dimensional coordination polymer host [Rh2(O2CPh)4(pyz)]n (pyz=pyrazine; see picture, left) undergoes a reversible phase transition under cooling that is induced by CO2 adsorption to give an inclusion complex, in which up to three CO2 molecules per polymer unit reside within channels (right).
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Takamizawa et al. (2003) studied this question.
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