Abstract
AbstractSingle‐crystal‐to‐single‐crystal (SCSC) transformations of porous crystals have been proved as an important platform for creating new materials. The current study describes porous molecular crystal with two different polymorphs based on the same chiral helicate modules can be controllably obtained when simply changing the crystallization solvents from diethyl ether to isopropyl ether. Interestingly, the β‐polymorph can also be effective obtained through SCSC transformations from α‐polymorph in solid state using isopropanol as a trigger. Compared with our reported α‐polymorph, the newly obtained β‐polymorph porous molecular crystal displays higher CO2 uptake and better selectivity for CO2 over N2 at 298 K. Meanwhile, as chiral solid adsorbents, both of β‐polymorph and α‐polymorph exhibit similar enantioselective separation abilities towards alcohols but different adsorption kinetics.
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