Direct Guest Exchange Induced Single-Crystal to Single-Crystal Transformation Accompanying Irreversible Crystal Expansion in Soft Porous Coordination Polymers

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• 作者：Tzu-Yan Ho ; Sheng-Ming Huang ; Jing-Yun Wu ; Kung-Chung Hsu ; Kuang-Lieh Lu
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：4266-4271
• 全文大小：371K
• ISSN：1528-7505

文摘

Two flexible porous coordination materials, [Mn(pybimc)₂]路2H₂O路G (G = toluene, 1_tol; THF, 1_thf), where pybimc = 2-(2鈥?pyridyl)-benzimidazole-5-carboxylate, featuring identical one-dimensional chain structure have been characterized. Guest exchange studies have exhibited that 1_tol cannot be converted to 1_thf through direct replacement of guest toluene molecules by THF molecules, but, of particular interest, 1_thf is actually converted to 1_tol and 1_aromatic (where aromatic = o-, m-, p-xylene) upon the exchange of THF to toluene and other aromatic molecules, respectively. This signifies a single-crystal to single-crystal transformation accompanied irreversible crystal expansion. In-depth analyses reveal that the nature of the weak yet sufficiently strong framework鈥揼uest C鈥揌路路路蟺 interactions, rather than the guest size, observed in this system plays a key role in guiding the adsorption of liquid-phase aromatics in the soft crystalline materials.