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• Kajiro, H
• Kondo, A
• Kaneko, K
• Kanoh, H
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• Kajiro, H
• Kondo, A
• Kaneko, K
• Kanoh, H
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• Kajiro, H
• Kondo, A
• Kaneko, K
• Kanoh, H

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Int. J. Mol. Sci. 2010, 11(10), 3803-3845; doi:10.3390/ijms11103803

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Flexible Two-Dimensional Square-Grid Coordination Polymers: Structures and Functions

Hiroshi Kajiro ^1,* , Atsushi Kondo ^2,3,†, Katsumi Kaneko ⁴ and Hirofumi Kanoh ²

¹ Nippon Steel Corporation, 20-1Shintomi, Futtsu, Chiba 293-8511, Japan ² Department of Chemistry, Graduate School of Science, Chiba University, Yayoi, Inage, Chiba 263-8522, Japan ³ Collaborative Innovation Center for Nanotech FIBER (nanoFIC), Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan ⁴ Research Center for Exotic Nanocarbons, Shinshu University, Wakasato 4-17-1, Nagano-city 380-8553, Japan ^† Current address: Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.

* Author to whom correspondence should be addressed.

Received: 21 August 2010; in revised form: 19 September 2010 / Accepted: 20 September 2010 / Published: 30 September 2010

(This article belongs to the Special Issue Metal Organic Frameworks)

Download PDF Full-Text [2172 KB, uploaded 30 September 2010 16:21 CEST]

Abstract: Coordination polymers (CPs) or metal-organic frameworks (MOFs) have attracted considerable attention because of the tunable diversity of structures and functions. A 4,4'-bipyridine molecule, which is a simple, linear, exobidentate, and rigid ligand molecule, can construct two-dimensional (2D) square grid type CPs. Only the 2D-CPs with appropriate metal cations and counter anions exhibit flexibility and adsorb gas with a gate mechanism and these 2D-CPs are called elastic layer-structured metal-organic frameworks (ELMs). Such a unique property can make it possible to overcome the dilemma of strong adsorption and easy desorption, which is one of the ideal properties for practical adsorbents.

Keywords: porous coordination polymer (PCP); metal-organic framework (MOF); gas adsorption; gas separation; structural transformation; gate phenomena; elastic layer‑structure; clathrate formation

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