Papers - MATSUDA Ryotaro

Exceptional Thermal Stability in a Supramolecular Organic Framework: Porosity and Gas Storage Reviewed

Wenbin Yang, Alex Greenaway, Xiang Lin, Ryotaro Matsuda, Alexander J. Blake, Claire Wilson, William Lewis, Peter Hubberstey, Susumu Kitagawa, Neil R. Champness, Martin Schroeder

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 132 ( 41 ) page： 14457 - 14469   2010.10

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

Reaction of beta-amino-beta-(pyrid-4-yl)acrylonitrile with the aromatic dicarboxaldehydes 9,10-bis(4formylphenyl)anthracene and terephthalaldehyde affords the dihydropyridyl products 9,10-bis(4-((3,5dicyano-2,6-dipyridyl)dihydropyridyl)phenyl)anthracene (L(1)) and 1,4-bis(4-(3,5-dicyano-2,6-dipyridyl)dihydropyridyl)benzene (L(2)), respectively. In the solid state [L(1)]center dot 2.5DMF center dot 3MeOH (SOF-1) crystallizes in the monoclinic space group P2(1)/C and forms a 3D stable supramolecular organic framework via strong N-H center dot center dot center dot N(py) hydrogen bonds and pi-pi interactions. The material incorporates pyridyl-decorated channels and shows permanent porosity in the solid state. The pore volumes of the desolvated framework SOF-1a calculated from the N(2) isotherm at 125 K and the CO(2) isotherm at 195 K are 0.227 and 0.244 cm(3)g(-1) respectively. The N(2) absorption capacity of SOF-1a at 77 K is very low, with an uptake of 0.63 mmol g(-1) at 1 bar, although saturation N(2) adsorption at 125 K is 6.55 mmol g(-1) (or 143 cm(3) g(-1)). At ambient temperature, SOF-1 a shows significant CO(2) adsorption with approximately 3 mol of CO(2) absorbed per mole of host at 16 bar and 298 K, corresponding to 69 cm(3) g(-1) at STP. SOF-1a also adsorbs significant amounts of C(2)H(2), with an uptake of 124 cm3 (STP) g(-1) (5.52 mmol g(-1)) at 1 bar at 195 K. Methane uptake at 195 K and 1 bar is 69 cm3 (STP) g(-1). Overall, gas adsorption measurements on desolvated framework SOF-1a reveal not only high capacity uptakes for C(2)H(2) and CO(2), compared to other crystalline molecular organic solids, but also an adsorption selectivity in the order C(2)H(2) > CO(2) > CH(4) > N(2). Overall, C(2)H(2)(270 K)/CH(4)(273 K) selectivity is 33.7 based on Henry's Law constant, while the C(2)H(2) (270 K)/CO(2)(273 K) ratio of uptake at 1 bar is 2.05. The less bulky analogue L2 crystallizes in the triclinic space group PT as two different solvates [L(2)]center dot 2DMF center dot 5C(6)H(6) (S2A) and [L(2)]center dot 2DMF center dot 4MeOH (S2B) as pale yellow tablets and blocks, respectively. Each L(2) molecule in S2A participates in two N-H center dot center dot center dot O hydrogen bonds between dihydropyridyl rings and solvent DMF molecules. Packing of these layers generates 1D nanochannels along the crystallographic a and b axes which host DMF and benzene molecules. In S2B, each L(2) ligand participates in hydrogen bonding via an N-H center dot center dot center dot O interaction between the N-H of the dihydropyridyl ring and the O of a MeOH and also via an N-H center dot center dot center dot O interaction between the N center of a pyridine ring and the H-O of a second MeOH molecule. The presence of the L(2)-HO Me hydrogen bonds prevents ligand-ligand hydrogen bonding. As a result, S2B crystallizes as one-dimensional chains rather than as an extended 3D network. Thermal removal of solvents from S2A results in conversion to denser phase S2C which shows no effective permanent porosity.

DOI： 10.1021/ja1042935

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Temperature responsive channel uniformity impacts on highly guest-selective adsorption in a porous coordination polymer Reviewed

Ryotaro Matsuda, Takashi Tsujino, Hiroshi Sato, Yoshiki Kubota, Kunimitsu Morishige, Masaki Takata, Susumu Kitagawa

CHEMICAL SCIENCE   Vol. 1 ( 3 ) page： 315 - 321   2010.9

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

Selective adsorption, so called "molecular sieving", is one of the significant functions of porous materials because it can play an important role in separation processes to obtain highly pure gases or petroleum. One of the next outstanding challenges of porous materials is the achievement of controllable "molecular sieving" in response to external environments. Here, we show a new temperature responsive 1-dimensional porous compound (CPL-11) which changes its structural uniformity in response to ambient temperature, which gives rise to changes in the effective pore size. As a result of the structural responsiveness, the seeming adsorption properties of CPL-11 are apparently opposite to conventional porous compounds expected from thermodynamic law, resulting in a highly selective adsorption for O-2 compared to Ar. This unexpected adsorption behavior indicates that the adsorption properties can be controlled by changing the channel uniformity of a porous framework depending on the ambient temperature.

DOI： 10.1039/c0sc00272k

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Magnetic properties of nitric oxide molecules physisorbed into nano-sized pores of MCM-41 Reviewed

Masaki Mito, Tsuyoshi Tatano, Yuki Komorida, Takayuki Tajiri, Hiroyuki Deguchi, Seishi Takagi, Shigemi Kohiki, Masaaki Ohba, Ryotaro Matsuda, Susumu Kitagawa

MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 132 ( 3 ) page： 464 - 469   2010.8

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We physisorbed nitric oxide (NO) molecules with spin (S) of 1/2 into the nano-sized pores of the mesoporous medium MCM-41, which allows molecule adsorption of the multi-layer form. The adsorption and desorption isotherms were observed at 121.5 K. and the effects of adsorption efficacy (i.e., the filling ratio, n) on the magnetic properties were investigated. Changes in the condensation state in the temperature region of 100-120 K were observed through the magnetic measurements, and the resultant phase diagram against n resembled that obtained for the physisorption of oxygen (O(2)) molecules with S=1. For T < 90 K, two NO molecules dimerized independently of n and diamagnetic dinitrogen dioxide (N(2)O(2)) was formed. The two-dimensional magnetic state, seen for O(2) physisorption, was not observed in the present system, probably due to the prominent electric polarity of the NO molecule. (C) 2010 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.micromeso.2010.03.028

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Photoactivation of a nanoporous crystal for on-demand guest trapping and conversion Reviewed

Hiroshi Sato, Ryotaro Matsuda, Kunihisa Sugimoto, Masaki Takata, Susumu Kitagawa

NATURE MATERIALS   Vol. 9 ( 8 ) page： 661 - 666   2010.8

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：NATURE PUBLISHING GROUP  

Porous compounds are ubiquitous and indispensable in daily life as adsorbents and catalysts. The discovery of a new porous compound with unique properties based on intrinsic nanosized space and surface functionalities is scientifically and technologically important. However, the functional species used in this context are limited to those that are sufficiently inert to not spoil the porous structures. Here, we show a new strategy to achieve a crystalline porous material with the pore surface regularly decorated with highly reactive 'bare' nitrenes that are photonically generated from stable 'dormant' precursors at will. The bare triplet nitrenes were accessible to and reacted with adsorbed oxygen or carbon monoxide molecules, which showed not only activation of the pore surface, but also a high probability of chemical trapping and conversion of guest molecules by light stimulation on demand.

DOI： 10.1038/NMAT2808

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Selective sorption of oxygen and nitric oxide by an electron-donating flexible porous coordination polymer Reviewed

Satoru Shimomura, Masakazu Higuchi, Ryotaro Matsuda, Ko Yoneda, Yuh Hijikata, Yoshiki Kubota, Yoshimi Mita, Jungeun Kim, Masaki Takata, Susumu Kitagawa

NATURE CHEMISTRY   Vol. 2 ( 8 ) page： 633 - 637   2010.8

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：NATURE PUBLISHING GROUP  

Porous coordination polymers are materials formed from metal ions that are bridged together by organic linkers and that can combine two seemingly contradictory properties-crystallinity and flexibility. Porous coordination polymers can therefore create highly regular yet dynamic nanoporous domains that are particularly promising for sorption applications. Here, we describe the effective selective sorption of dioxygen and nitric oxide by a structurally and electronically dynamic porous coordination polymer built from zinc centres and tetracyanoquinodimethane (TCNQ) as a linker. In contrast to a variety of other gas molecules (C(2)H(2), Ar, CO(2), N(2) and CO), O(2) and NO are accommodated in its pores. This unprecedented preference arises from the concerted effect of the charge-transfer interaction between TCNQ and these guests, and the switchable gate opening and closing of the pores of the framework. This system provides further insight into the efficient recognition of small gas molecules.

DOI： 10.1038/NCHEM.684

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Flexibility of Porous Coordination Polymers Strongly Linked to Selective Sorption Mechanism Reviewed

Satoru Shimomura, Ryotaro Matsuda, Susumu Kitagawa

CHEMISTRY OF MATERIALS   Vol. 22 ( 14 ) page： 4129 - 4131   2010.7

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

DOI： 10.1021/cm101410h

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Highly Porous and Stable Coordination Polymers as Water Sorption Materials Reviewed

George Akiyama, Ryotaro Matsuda, Susumu Kitagawa

CHEMISTRY LETTERS   Vol. 39 ( 4 ) page： 360 - 361   2010.4

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

Three MIL-100-type porous coordination polymers were synthesized using different types of anions and their water sorption properties were investigated. All of the compounds adsorbed huge amounts of water (0.6g g(-1)) at a moderate humidity (P/P-0 < 0.6), and one of the compounds showed the same adsorption property even after two thousand replicate water sorption tests. In addition, the pressure of water adsorption was found to be controlled by counter anions incorporated in the structure, which was attributed to the hydration energy of the anions.

DOI： 10.1246/cl.2010.360

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Incommensurate guest adsorption in bellows-shaped one-dimensional channels of porous coordination polymers Reviewed

Ryotaro Matsuda, Ryo Kitaura, Yoshiki Kubota, Tatsuo C. Kobayashi, Masaki Takata, Susumu Kitagawa

MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 129 ( 3 ) page： 296 - 303   2010.4

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Adsorption isotherms of N(2), O(2), CO(2), and Xe on a flexible microporous coordination polymer, CPL-2 [Cu(2)(pzdc)(2)(bpy)]center dot(pzdc = pyrazine-2,3-dicarboxylate; bpy = 4,4'-bipyridine), possessing bellows-shaped one-dimensional channels were measured. A nonintegral number of each of the N(2), O(2), CO(2), and Xe molecules can be accommodated in each unit pore, which indicates that all guest molecules are accommoda dated in the so-called "incommensurate fashion". in situ synchrotron X-ray powder diffraction patterns of CPL-2 with guest molecules were recorded. The unit cells were determined from each pattern. It Was found that the host CPL-2 exhibits different crystal transformation with the accommodation of each guest molecule. This indicates that, even in the case of incommensurate adsorption, the flexible framework of a microporous coordination polymer can transform each pore to suit different guest molecules. (C) 2009 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.micromeso.2009.06.023

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Systematic Construction of Porous Coordination Pillared-layer Structures and Their Sorption Properties Reviewed

Hirotoshi Sakamoto, Ryo Kitaura, Ryotaro Matsuda, Susumu Kitagawa, Yoshiki Kubota, Masaki Takata

CHEMISTRY LETTERS   Vol. 39 ( 3 ) page： 218 - 219   2010.3

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Two novel coordination polymers, {[Cu-2(pzdc)(2)L]center dot mH(2)O}n where pzdc is pyrazine-2,3-dicarboxylate and L is 2,7-diazapyrene (CPL-3) and 1,2-azopyridine (CPL-4), respectively, having 3D pillared-layer structure were prepared and the compounds showed gas adsorption properties depending on L.

DOI： 10.1246/cl.2010.218

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Chemistry of Porous Coordination Polymers Having Multimodal Nanospace and Their Multimodal Functionality Reviewed

Joobeom Seo, Hirotoshi Sakamoto, Ryotaro Matsuda, Susumu Kitagawa

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   Vol. 10 ( 1 ) page： 3 - 20   2010.1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER SCIENTIFIC PUBLISHERS  

Remarkable advances in the recent development of porous coordination polymers (PCPs) or metal organic frameworks (MOFs) have paved the way toward functional chemistry having potential application such as molecular storage, separation, and catalysis. Moreover flexible PCPs, which are structurally transformable depending upon guest molecules adsorption/desorption, have received much attention because they provide unique properties, dissimilar to those of zeolites. PCPs can be categorized into structurally monomodal and multimodal classes. Monomodal PCPs possess single uniform pores in the framework. In contrast, multimodal PCPs have more than two types of pores in the framework. Interpenetrated PCPs can possess more than two types of pores with different sizes and shapes in the same framework depending on relative position of individual motifs, resulting in multimodal PCPs. Moreover, interpenetrated PCPs have several advantages, such as high thermal stability, flexibility, and ultramicropore for effective adsorption. In this review, chemistry of PCPs based on monomodal and multimodal PCPs are summarized and discussed.

DOI： 10.1166/jnn.2010.1494

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Periodic molecular boxes in entangled enantiomorphic lcy nets Reviewed

Yohei Takashima, Charlotte Bonneau, Shuhei Furukawa, Mio Kondo, Ryotaro Matsuda, Susumu Kitagawa

CHEMICAL COMMUNICATIONS   Vol. 46 ( 23 ) page： 4142 - 4144   2010

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

In this contribution, we present a coordination framework built from a novel (Zn(4)O)(O(2)C)(6) metaprismatic unit showing the interpenetration of a pair of enantiomorphic lcy nets that exhibits commensurate sorption properties.

DOI： 10.1039/c002924f

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High-Field Magnetization Process of O(2) Adsorbed in a Microporous Coordination Polymer CPL-1 at Various Temperatures Reviewed

A. Hori, T. C. Kobayashi, A. Matsuo, K. Kindo, R. Matsuda, S. Kitagawa

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   Vol. 200   2010

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOP PUBLISHING LTD  

High-field magnetization measurements have been performed at various temperatures on the molecular oxygen adsorbed in a microporous coordination polymer CPL-1. Molecular oxygen with S = 1 forms O(2)-O(2) dimer in the nanochannels of CPL-1. The magnetic properties can be explained by not the S = 1 Heisenberg antiferromagnetic dimer model but the O(2)-O(2) dimer model taking into account the spin-dependent intermolecular potential. This feature is attributed to the fact that the magnetic interaction between O(2) is comparable to the van der Waals force.

DOI： 10.1088/1742-6596/200/2/022018

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Modification of flexible part in Cu2+ interdigitated framework for CH4/CO2 separation Reviewed

Yasutaka Inubushi, Satoshi Horike, Tomohiro Fukushima, George Akiyama, Ryotaro Matsuda, Susumu Kitagawa

CHEMICAL COMMUNICATIONS   Vol. 46 ( 48 ) page： 9229 - 9231   2010

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The structural flexibility of Cu2+ interdigitated layer type framework was controlled and the compound represented clear separation property of CH4/CO2 at range of 0-1.0 MPa and recovery of adsorbed CO2 above 0.1 MPa.

DOI： 10.1039/c0cc01294g

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Control of Interpenetration for Tuning Structural Flexibility Influences Sorption Properties Reviewed

Sareeya Bureekaew, Hiroshi Sato, Ryotaro Matsuda, Yoshiki Kubota, Raita Hirose, Jungeun Kim, Kenichi Kato, Masaki Takata, Susumu Kitagawa

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 49 ( 42 ) page： 7660 - 7664   2010

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

DOI： 10.1002/anie.201002259

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The RIKEN Materials Science Beamline at SPring-8: Towards Visualization of Electrostatic Interaction Reviewed

Kenichi Kato, Raita Hirose, Michitaka Takemoto, Sunyeo Ha, Jungeun Kim, Masakazu Higuchi, Ryotaro Matsuda, Susumu Kitagawa, Masaki Takata

SRI 2009: THE 10TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION   Vol. 1234   page： 875 - +   2010

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

In order to visualize molecular interaction by the experimental electrostatic potential analysis we have optimized the optical parameters and developed the high-resolution Debye-Scherrer camera at the RIKEN materials science beamline, BL44B2 of SPring-8. For the purpose the camera was designed to be equipped with the hybrid X-ray detector system. One is the conventional detector, the imaging plate readout off-line to carry out high d (interplanar spacing)-resolution measurements and the other is the CCD detector, which can be operated in a camera at variable distances for high angle-resolution measurements. In addition we have been developing an in-situ properties measurement system to visualize the electrostatic interaction completely synchronized with material functions.

DOI： 10.1063/1.3463354

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Y. Takashima, C. Bonneau, S. Furukawa, M. Kondo, R. Matsuda, S. Kitagawa

Periodic molecular, boxes in, angled, nantiomorphic, lcy nets

Chem. Commun., 46, 4142-4144 (2010)     page： .   2010

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New Interpenetrated Copper Coordination Polymer Frameworks having Porous Properties Reviewed

Prakash Kanoo, Ryotaro Matsuda, Masakazu Higuchi, Susumu Kitagawa, Tapas Kumar Maji

CHEMISTRY OF MATERIALS   Vol. 21 ( 24 ) page： 5860 - 5866   2009.12

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Two new 3-fold inter-penetrated 3D microporous metal-organic coordination polymers (MOCPs) of Cu(II), [Cu(3)(blpy)(1.5)(2,6-ndc)(3)](n) (1) and {[Cu(bpe)0.5(2,6-ndc)]center dot 0.5H(2)O}(n) (2) (bipy = 4,4'-bipyridine; bpe 1,2-bis(4-pyridyl)ethane; and 2,6-ndc = 2,6-naphthalenedicarboxylate), have been synthesized using a mixed-ligand system and Structurally characterized by single-crystal X-ray diffraction study. Room-temperature reaction of Cu(II) with bipy and 2,6-ndc affords 1, whereas reaction with bpe and 2,6-ndc yields 2. Structure determination reveals that in both cases, a 2D square grid made by Cu(II) and 2,6-ndc with the aid Of Cu(2)(CO(2))(4) paddlewheel building block is connected by bipy (1) or bpe (2) organic pillar results 3D alpha-polonium type frameworks. Framework I is rigid and robust without any guest molecules, whereas 2 is flexible, realized by the guest induced structural transformations. Both the frameworks show high thermal stability. Framework I and dehydrated form of 2, i.e 2'contains 16.6% and 21.4% void space, respectively and Langmuir surface area calculated from nitrogen adsorption study for 1 and 2' is 113.0 and 337.5 m(2)/g, respectively. Both the frameworks can store approximately 1 wt% of molecular hydrogen at 77 K and 15 bar, in particular, the density of adsorbed hydrogen in 1 is one of the highest reported so far in porous MOCPS. Compounds 1 and 2' can also store 11.0 and 13.2 wt % carbon dioxide at 195 K.

DOI： 10.1021/cm9025683

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A Pillared-Layer Coordination Polymer with a Rotatable Pillar Acting as a Molecular Gate for Guest Molecules Reviewed

Joobeom Seo, Ryotaro Matsuda, Hirotoshi Sakamoto, Charlotte Bonneau, Susumu Kitagawa

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 131 ( 35 ) page： 12792 - 12800   2009.9

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The design of pore properties utilizing flexible motifs and functional groups is of importance to obtain porous coordination polymers with desirable functions. We have prepared a 3D pillared-layer coordination polymer, {[Cd(2)(pzdc)(2)L(H(2)O)(2)]center dot 5(H(2)O)center dot(CH(3)CH(2)OH)}(n) (1, H(2)pzdc = 2,3-pyrazinedicarboxylic acid; L = 2,5-bis(2-hydroxyethoxy)-1,4-bis(4-pyridyl)benzene) showing (i) a rotatable pillar bearing ethylene glycol side chains acting as a molecular gate with locking/unlocking interactions triggered by guest inclusion between the side chains, (ii) framework flexibility with slippage of the layers, and (iii) coordinatively unsaturated metal centers as guest accessible sites through the removal of the water coligands. The framework clearly shows reversible single-crystal-to-single-crystal transformations in response to the removal and rebinding of guest molecules, the observation of these processes has provided fundamental clues to the understanding of the sorption profiles. The X-ray structures indicate that the 3D host framework is retained during the transformations, involving mainly rotation of the pillars and slippage of the layers. The structure of dried form 2, [Cd(2)(pzdc)(2)L](n), has no void volume and no water coligands. Interestingly, the adsorption isotherm of water for 2 at 298 K exhibits three distinct steps coinciding with the framework functions. Compound 2 favors the uptake of CO(2) (195 K) over N(2) (77 K) and O(2) (77 K). Above all, we report on a molecular gate with a rotational module exhibiting a locking/unlocking system which accounts for gate-opening type sorption profiles.

DOI： 10.1021/ja904363b

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Bistability of Magnetization without Spin-Transition in a High-Spin Cobalt(II) Complex due to Angular Momentum Quenching Reviewed

Gergely Juhasz, Ryotaro Matsuda, Shinji Kanegawa, Kaori Inoue, Osamu Sato, Kazunari Yoshizawa

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 131 ( 13 ) page： 4560 - +   2009.4

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[Co(NO3)(2)L] (L: 2,6-di(pyrazol-1-yl)pyrazine) (1) exhibits an abrupt transition with hysteresis in magnetic susceptibility between 228 and 240 K. The results of spectroscopic and XRD measurements showed that I is in the high spin state in the whole temperature range. Therefore the observed hysteresis is not due to a spin transition but corresponds to a partial quenching of the angular momentum contribution to the magnetic susceptibility. Crystallographic measurements on the low- and high-temperature form of 1, combined with DFT calculations, showed that a symmetric twisting of the coordinating nitrate ions upon the transition is the most important factor in the orbital quenching mechanism. Utilizing such quenching to control magnetic properties can be a new approach to engineer transition metal complexes with magnetic functionalities without changing their spin or oxidation state.

DOI： 10.1021/ja808448j

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Hindered Rotation of Methane Molecules in the One-Dimensional Nanochannel of a Porous Coordination Polymer Reviewed

Yoshiki Kubota, Masaki Takata, Ryo Kitaura, Ryotaro Matsuda, Tatsuo C. Kobayashi, Susumu Kitagawa

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   Vol. 9 ( 1 ) page： 69 - 76   2009.1

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The crystal structure of a microporous coordination polymer with adsorbed methane gas was determined by in situ synchrotron powder diffraction of the gas adsorption and the MEM (maximum entropy method)/Rietveld method. Methane molecules were found to be adsorbed forming a one-dimensional array in the nanochannels of the polymer. The MEM charge density distribution of the adsorbed methane molecules indicated some protrusions which were not observed in that of a spherical atom of adsorbed argon. This was interpreted as a mixed distribution of two uniaxially rotating molecules with different pivotal axes. The methane molecules displayed hindered rotation depending on the shape of the nanopore surface. This result indicates the capability to control the molecular arrangement and orientation by the adsorption of gas molecules on the precisely designed nanopores of coordination polymers.

DOI： 10.1166/jnn.2009.J085

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