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Guest shape-responsive fitting of porous coordination polymer with shrinkable framework.

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TLDR
This crystal transformation provides a new pore structure that is well suited for benzene molecules, and is described as a "shape-responsive fitting" transformation, which gives rise to a new guideline.
Abstract
In situ synchrotron X-ray powder diffraction patterns of porous coordination polymers {[Cu2(pzdc)2(bpy)]·G} have been measured (pzdc = pyrazine-2,3-dicarboxylate, bpy = 4,4‘-bipyridine) (where G = H2O for CPL-2 ⊃ H2O, G = benzene for CPL-2 ⊃ benzene, and G = void for the apohost). The structures of apohost and CPL-2 ⊃ benzene were determined from Rietveld analysis. Adsorption of benzene in the channels induced a remarkable contraction in the crystal (b axis; 6.8%, volume; 4.9%), although the channels were occupied by the benzene molecules. This crystal transformation provides a new pore structure that is well suited for benzene molecules, and we denote it as a “shape-responsive fitting” transformation. This type of pore gives rise to a new guideline:  frameworks can be composed of flexible motifs that are linked via strong bond and/or stiff motifs that are connected via weaker bonds.

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Soft porous crystals

TL;DR: The concept of the cooperative integration of 'softness' and 'regularity' and the relationship between the structures and properties of these materials in view of their practical applications are discussed.
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Metal-organic frameworks: opportunities for catalysis.

TL;DR: The role of metal-organic frameworks (MOFs) in the field of catalysis is discussed, and special focus is placed on their assets and limits in light of current challenges in catalysis and green chemistry.
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Coordination polymer networks with O- and N-donors: What they are, why and how they are made

TL;DR: A review on metal ion containing coordination polymer networks is given in this paper, where the authors highlight the current research in the field by giving a short overview on the concept of coordination polymers networks, how and why they are made.
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Chemistry of coordination space of porous coordination polymers

TL;DR: In this article, the coordination space is defined as the space where the coordination bond plays an important role in the formation of the spatial structures and where various physical properties are exhibited, and the coordination spaces provided by porous coordination polymers, and their uniqueness is illustrated with current representative results.
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A flexible interpenetrating coordination framework with a bimodal porous functionality.

TL;DR: A bimodal microporous twofold interpenetrating network is designed and synthesized, showing the first case of controlled sorption properties in flexible porous frameworks.
References
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Systematic Design of Pore Size and Functionality in Isoreticular MOFs and Their Application in Methane Storage

TL;DR: Metal-organic framework (MOF-5), a prototype of a new class of porous materials and one that is constructed from octahedral Zn-O-C clusters and benzene links, was used to demonstrate that its three-dimensional porous system can be functionalized with the organic groups and can be expanded with the long molecular struts biphenyl, tetrahydropyrene, pyrene, and terphenyl.
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Modular chemistry: secondary building units as a basis for the design of highly porous and robust metal-organic carboxylate frameworks.

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