Abstract
Abstract The unique functions of flexible coordination polymers (FCPs) based on the dynamic structural changes are described. Coordination polymers with flexible structures have been classified into four types in this review. Type I shows reversible interconversions between porous and nonporous frameworks in response to removals and reinclusions of guest molecules from/into the channels. FCPs that exhibit Type I structural changes are general. Type II FCPs show reversible switches between the porous and nonporous frameworks depending on the guest molecules. The two‐dimensional coordination polymers that show reversible structural changes in response to the present solvents have been presented as examples of Type II FCPs. Type III FCPs involve the creation of vacant channels for additional guest molecules from nonporous compounds, which is triggered by chemical stimuli. The hydrogen bond‐assembled metal complex has been shown as an example of Tpye III materials. Type IV FCPs have the channel structures that show reversible transformations depending on the physical stimuli. Type III and IV FCPs are rare and unique. Adsorption of EtOH guest molecules induced by the addition of CH 3 OH, which is a smaller guest molecule, is demonstrated. Mechanical trapping of guest molecules in the closed channels induced by physical stimuli is presented as FCPs demonstrating Type IV structural changes.
Published Version
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