Nonporous but yet Gas-Sorbing Molecular Crystals Formed by Macrocyclic Compounds with Nitrogen-Bridges

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  • TSUE Hirohito
    Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University

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  • 窒素原子を配した大環状化合物が構築する非多孔質有機分子性結晶への気体吸蔵
  • チッソ ゲンシ オ ハイシタ ダイカンジョウ カゴウブツ ガ コウチク スル ヒタコウシツ ユウキ ブンシセイ ケッショウ エ ノ キタイキュウゾウ

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Abstract

Described are the nonporous but yet gas-sorbing molecular crystals of nitrogen-bridged calixarene analogues (azacalixarenes) that have recently emerged as a new calixarene family. Single crystals of cyclic tetramer with nonporous crystal architecture exhibited the highly selective uptake of carbon dioxide, and its sorption state was successfully visualized at an atomic level by means of X-ray crystallography. Cyclic pentamer yielded two polymorphs both with nonporous crystal structures; one polymorph was truly nonporous to all of the examined gases, whereas another one showed the selective capture of carbon dioxide. Here we report the solid-gas sorption behavior and mechanism in the nonporous molecular crystals of this new calixarene family.

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