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

Two flexible porous coordination materials, [Mn­(pybimc)2]­·2H2O·G (G = toluene, 1 tol ; THF, 1 thf ), where pybimc = 2-(2′-pyridyl)-benzimidazole-5-carboxylate, featuring identical one-dimensional chain structure have been characterized. Guest exchange studies have exhibited that 1 tol cannot be co...

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Published in:Crystal growth & design 2015-09, Vol.15 (9), p.4266-4271
Main Authors: Ho, Tzu-Yan, Huang, Sheng-Ming, Wu, Jing-Yun, Hsu, Kung-Chung, Lu, Kuang-Lieh
Format: Article
Language:English
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Summary:Two flexible porous coordination materials, [Mn­(pybimc)2]­·2H2O·G (G = toluene, 1 tol ; THF, 1 thf ), where pybimc = 2-(2′-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–guest C–H···π 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.
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.5b00565