The Experts below are selected from a list of 69735 Experts worldwide ranked by ideXlab platform
Susumu Kitagawa - One of the best experts on this subject based on the ideXlab platform.
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carbon dioxide capture and efficient fixation in a dynamic porous Coordination Polymer
Nature Communications, 2019Co-Authors: Jiajia Zheng, Nobuhiko Hosono, Kenichi Otake, Jian Wang, Yanhong Liu, Lingling Xia, Min Jiang, Shigeyoshi Sakaki, Susumu KitagawaAbstract:Direct structural information of confined CO2 in a micropore is important for elucidating its specific binding or activation mechanism. However, weak gas-binding ability and/or poor sample crystallinity after guest exchange hindered the development of efficient materials for CO2 incorporation, activation and conversion. Here, we present a dynamic porous Coordination Polymer (PCP) material with local flexibility, in which the propeller-like ligands rotate to permit CO2 trapping. This process can be characterized by X-ray structural analysis. Owing to its high affinity towards CO2 and the confinement effect, the PCP exhibits high catalytic activity, rapid transformation dynamics, even high size selectivity to different substrates. Together with an excellent stability with turnover numbers (TON) of up to 39,000 per Zn1.5 cluster of catalyst after 10 cycles for CO2 cycloaddition to form value-added cyclic carbonates, these results demonstrate that such distinctive structure is responsible for visual CO2 capture and size-selective conversion. Porous Coordination Polymers that possess structural flexibility show great promise for gas adsorption and catalysis. Here the authors synthesize a dynamic porous Coordination Polymer with rotating ligands that permit effective CO2 trapping, and demonstrate subsequent CO2 cycloaddition to epoxides.
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a crystalline porous Coordination Polymer decorated with nitroxyl radicals catalyzes aerobic oxidation of alcohols
Journal of the American Chemical Society, 2014Co-Authors: Ryotaro Matsuda, Iku Tanaka, Hiroshi Sato, Prakash Kanoo, Hyung Joon Jeon, Maw Lin Foo, Atsushi Wakamiya, Yasujiro Murata, Susumu KitagawaAbstract:A porous Coordination Polymer (PCP) has been synthesized employing an organic ligand in which a stable free radical, isoindoline nitroxide, is incorporated. The crystalline PCP possesses one-dimensional channels decorated with the nitroxyl catalytic sites. When O2 gas or air was used as the oxidant, this PCP was verified to be an efficient, recyclable, and widely applicable catalyst for selective oxidation of various alcohols to the corresponding aldehydes or ketones.
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integration of intrinsic proton conduction and guest accessible nanospace into a Coordination Polymer
Journal of the American Chemical Society, 2013Co-Authors: Daiki Umeyama, Satoshi Horike, Munehiro Inukai, Susumu KitagawaAbstract:We report the synthesis and characterization of a Coordination Polymer that exhibits both intrinsic proton conductivity and gas adsorption. The Coordination Polymer, consisting of zinc ions, benzimidazole, and orthophosphate, exhibits a degree of flexibility in that it adopts different structures before and after dehydration. The dehydrated form shows higher intrinsic proton conductivity than the original form, reaching as high as 1.3 × 10–3 S cm–1 at 120 °C. We found that the rearranged conduction path and liquid-like behavior of benzimidazole molecules in the channel of the framework afforded the high proton conductivity. Of the two forms of the framework, only the dehydrated form is porous to methanol and demonstrates guest-accessible space in the structure. The proton conductivity of the dehydrated form increases by 24 times as a result of the in situ adsorption of methanol molecules, demonstrating the dual functionality of the framework. NMR studies revealed a hydrogen-bond interaction between the fr...
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postsynthesis modification of a porous Coordination Polymer by licl to enhance h transport
Journal of the American Chemical Society, 2013Co-Authors: Satoshi Horike, Daiki Umeyama, Munehiro Inukai, Yusuke Kamitsubo, Tomohiro Fukushima, Tomoya Itakura, Susumu KitagawaAbstract:A Ca2+ porous Coordination Polymer with 1D channels was functionalized by the postsynthesis addition of LiCl to enhance the H+ conductivity. The compound showed over 10–2 S cm–1 at 25 °C and 20% relative humidity. Pulse-field gradient NMR elucidated that the fast H+ conductivity was achieved by the support of Li+ ion movements in the channel.
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sequential functionalization of porous Coordination Polymer crystals
Angewandte Chemie, 2011Co-Authors: Kenji Hirai, Shuhei Furukawa, Mio Kondo, Hiromitsu Uehara, Osami Sakata, Susumu KitagawaAbstract:Crystal extractor: heterostructured porous Coordination Polymer crystals fabricated using epitaxial growth have two contradictory porous functions, namely size selectivity and high storage. The crystals not only extract linear petroleum molecules from a mixture with its branched isomer, even at very low concentrations of linear isomer (1 wt %), but also shows improved accumulation of the molecules in its pores.
Xiaoming Chen - One of the best experts on this subject based on the ideXlab platform.
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temperature or guest induced drastic single crystal to single crystal transformations of a nanoporous Coordination Polymer
Journal of the American Chemical Society, 2005Co-Authors: Jiepeng Zhang, Yanyong Lin, Weixiong Zhang, Xiaoming ChenAbstract:Aside from a temperature-induced structural transformation, a new nanoporous Coordination Polymer [Ag6Cl(atz)4]·OH·6H2O (Hatz = 3-amino-1,2,4,-triazole) comprised of interpenetrated Ag3(atz)2 Coordination nets exhibits a single-crystal-to-single-crystal transformation of a 5-fold to 6-fold net interpenetration change triggered by guest desorption/absorption.
Daniel Maspoch - One of the best experts on this subject based on the ideXlab platform.
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A First Cyclodextrin-Transition Metal Coordination Polymer
Crystal Growth & Design, 2016Co-Authors: Sabina Rodríguez-hermida, Inhar Imaz, Javier Pérez-carvajal, Jordi Juanhuix, Daniel MaspochAbstract:The synthesis, X-ray crystallographic structure, and water uptake measurements of the first Coordination Polymer made of a cyclodextrin and a transition metal ion (in this case, Cu2+) are shown. This Coordination Polymer is made by connecting paddle-wheel Cu2+ units through a γ-cyclodextrin functionalized with eight carboxylate groups, is stable in water, and shows selective water-induced reversible structural transformations.
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Coordination Polymer Nanofibers Generated by Microfluidic Synthesis
Journal of the American Chemical Society, 2011Co-Authors: Josep Puigmartí-luis, Marta Rubio-martinez, Urs Hartfelder, Inhar Imaz, Daniel Maspoch, Petra S. DittrichAbstract:One-dimensional Coordination Polymer nanostructures are an emerging class of nanoscale materials with many potential applications. Here, we report the first case of Coordination Polymer nanofibers assembled using microfluidic technologies. Unlike common synthetic procedures, this approach enables parallel synthesis with an unprecedented level of control over the Coordination pathway and facilitates the formation of 1D Coordination Polymer assemblies at the nanometer length scale. Finally, these nanostructures, which are not easily constructed with traditional methods, can be used for various applications, for example as templates to grow and organize functional inorganic nanoparticles.
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Coordination Polymer particles as potential drug delivery systems
Chemical Communications, 2010Co-Authors: Inhar Imaz, Marta Rubiomartinez, Lorena Garciafernandez, Francisca Garcia, Daniel Ruizmolina, Jordi Hernando, Victor F Puntes, Daniel MaspochAbstract:Micro- and nanoscale Coordination Polymer particles can be used for encapsulating and delivering drugs. In vitro cancer cell cytotoxicity assays showed that these capsules readily release doxorubicin, which shows anticancer efficacy. The results from this work open up new avenues for metal–organic capsules to be used as potential drug delivery systems.
Daiki Umeyama - One of the best experts on this subject based on the ideXlab platform.
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integration of intrinsic proton conduction and guest accessible nanospace into a Coordination Polymer
Journal of the American Chemical Society, 2013Co-Authors: Daiki Umeyama, Satoshi Horike, Munehiro Inukai, Susumu KitagawaAbstract:We report the synthesis and characterization of a Coordination Polymer that exhibits both intrinsic proton conductivity and gas adsorption. The Coordination Polymer, consisting of zinc ions, benzimidazole, and orthophosphate, exhibits a degree of flexibility in that it adopts different structures before and after dehydration. The dehydrated form shows higher intrinsic proton conductivity than the original form, reaching as high as 1.3 × 10–3 S cm–1 at 120 °C. We found that the rearranged conduction path and liquid-like behavior of benzimidazole molecules in the channel of the framework afforded the high proton conductivity. Of the two forms of the framework, only the dehydrated form is porous to methanol and demonstrates guest-accessible space in the structure. The proton conductivity of the dehydrated form increases by 24 times as a result of the in situ adsorption of methanol molecules, demonstrating the dual functionality of the framework. NMR studies revealed a hydrogen-bond interaction between the fr...
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postsynthesis modification of a porous Coordination Polymer by licl to enhance h transport
Journal of the American Chemical Society, 2013Co-Authors: Satoshi Horike, Daiki Umeyama, Munehiro Inukai, Yusuke Kamitsubo, Tomohiro Fukushima, Tomoya Itakura, Susumu KitagawaAbstract:A Ca2+ porous Coordination Polymer with 1D channels was functionalized by the postsynthesis addition of LiCl to enhance the H+ conductivity. The compound showed over 10–2 S cm–1 at 25 °C and 20% relative humidity. Pulse-field gradient NMR elucidated that the fast H+ conductivity was achieved by the support of Li+ ion movements in the channel.
Jiepeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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temperature or guest induced drastic single crystal to single crystal transformations of a nanoporous Coordination Polymer
Journal of the American Chemical Society, 2005Co-Authors: Jiepeng Zhang, Yanyong Lin, Weixiong Zhang, Xiaoming ChenAbstract:Aside from a temperature-induced structural transformation, a new nanoporous Coordination Polymer [Ag6Cl(atz)4]·OH·6H2O (Hatz = 3-amino-1,2,4,-triazole) comprised of interpenetrated Ag3(atz)2 Coordination nets exhibits a single-crystal-to-single-crystal transformation of a 5-fold to 6-fold net interpenetration change triggered by guest desorption/absorption.