A Temporarily Pore-Openable Porous Coordination Polymer for Guest Adsorption/Desorption
- Shin-ichiro Noro*Shin-ichiro Noro*Email: [email protected] (S.N.).Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, JapanGraduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, JapanMore by Shin-ichiro Noro
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- Yu MengYu MengGraduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, JapanMore by Yu Meng
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- Kazushige SuzukiKazushige SuzukiFaculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, JapanMore by Kazushige Suzuki
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- Minori SugiuraMinori SugiuraGraduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, JapanMore by Minori Sugiura
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- Yuh HijikataYuh HijikataInstitute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, JapanMore by Yuh Hijikata
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- Jenny PirilloJenny PirilloInstitute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, JapanMore by Jenny Pirillo
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- Xin ZhengXin ZhengFaculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, JapanMore by Xin Zheng
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- Kiyonori TakahashiKiyonori TakahashiResearch Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, JapanMore by Kiyonori Takahashi
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- Takayoshi NakamuraTakayoshi NakamuraResearch Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, JapanMore by Takayoshi Nakamura
Abstract
Flexible porous coordination polymers (PCPs)/metal–organic frameworks are unique materials that have potential applications as components of highly efficient separation, sensor, and actuator systems. In general, the structures of flexible PCPs drastically change upon guest loading. In this investigation, we uncovered the rare one-dimensional PCP [Cu2(bza)4(2-apyr)] (1; bza = benzoate and 2-apyr = 2-aminopyrimidine), which exhibits a unique type of flexibility involving temporary pore opening. Single-crystal X-ray diffraction analysis revealed that desolvated 1 and ethyl acetate (AcOEt)-loaded (1·AcOEt) and CO2-loaded (1·CO2) 1 have isolated pores. In the case of 1, the pore structure prevents guest penetration. In addition, the isolated pore structures of 1·AcOEt and 1·CO2 block guest release. However, 1 participates in reversible adsorption/desorption of AcOEt and CO2 because pore opening occurs temporarily. The CO2 adsorption/desorption isotherms of 1 are type I and dissimilar to those observed in traditional flexible PCPs with adsorption/desorption hysteresis. The lesser conventional flexibility displayed by 1 could offer new insight into the design of flexible PCPs.
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