35681
2012
2012
eng
11630
11640
11
37
18
article
Wiley-VCH
Weinheim
1
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An isoreticular family of microporous metal-organic frameworks based on zinc and 2-substituted imidazolate-4-amide-5-imidate Syntheses, structures and properties
We report on a new series of isoreticular frameworks based on zinc and 2-substituted imidazolate-4-amide-5-imidate (IFP-14, IFP=imidazolate framework Potsdam) that form one-dimensional, microporous hexagonal channels. Varying R in the 2-substitued linker (R=Me (IFP-1), Cl (IFP-2), Br (IFP-3), Et (IFP-4)) allowed the channel diameter (4.01.7 angstrom), the polarisability and functionality of the channel walls to be tuned. Frameworks IFP-2, IFP-3 and IFP-4 are isostructural to previously reported IFP-1. The structures of IFP-2 and IFP-3 were solved by X-ray crystallographic analyses. The structure of IFP-4 was determined by a combination of PXRD and structure modelling and was confirmed by IR spectroscopy and 1H MAS and 13C CP-MAS NMR spectroscopy. All IFPs showed high thermal stability (345400?degrees C); IFP-1 and IFP-4 were stable in boiling water for 7 d. A detailed porosity analysis was performed on the basis of adsorption measurements by using various gases. The potential of the materials to undergo specific interactions with CO2 was investigated by measuring the isosteric heats of adsorption. The capacity to adsorb CH4 (at 298 K), CO2 (at 298 K) and H2 (at 77 K) at high pressure were also investigated. In situ IR spectroscopy showed that CO2 is physisorbed on IFP-14 under dry conditions and that both CO2 and H2O are physisorbed on IFP-1 under moist conditions.
Chemistry - a European journal
10.1002/chem.201200889
0947-6539
wos:2011-2013
WOS:000308313100020
Holdt, HJ (reprint author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., holdt@chem.uni-potsdam.de
Deutsche Forschungsgemeinschaft [SPP-1362]
Franziska Debatin
Karsten Behrens
Jens Weber
Igor A. Baburin
Arne Thomas
Johannes Schmidt
Irena Senkovska
Stefan Kaskel
Alexandra Kelling
Niklas Hedin
Zoltan Bacsik
Stefano Leoni
Gotthard Seifert
Christian Jäger
Christina Günter
Uwe Schilde
Alwin Friedrich
Hans-Jürgen Holdt
eng
uncontrolled
adsorption
eng
uncontrolled
metal- organic frameworks
eng
uncontrolled
microporous materials
eng
uncontrolled
N
eng
uncontrolled
O ligands
eng
uncontrolled
zinc
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
36316
2012
2012
eng
10221
10227
7
20
22
article
Royal Society of Chemistry
Cambridge
1
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Mixed gas adsorption of carbon dioxide and methane on a series of isoreticular microporous metal-organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates
In this work the adsorption of CO2 and CH4 on a series of isoreticular microporous metal-organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates, IFP-1-IFP-6 (IFP Imidazolate Framework Potsdam), is studied firstly by pure gas adsorption at 273 K. All experimental isotherms can be nicely described by using the Toth isotherm model and show the preferred adsorption of CO2 over CH4. At low pressures the Toth isotherm equation exhibits a Henry region, wherefore Henry's law constants for CO2 and CH4 uptake could be determined and ideal selectivity (alpha CO2/CH4) has been calculated. Secondly, selectivities were calculated from mixture data by using nearly equimolar binary mixtures of both gases by a volumetric-chromatographic method to examine the IFPs. Results showed the reliability of the selectivity calculation. Values of (alpha CO2/CH4) around 7.5 for IFP-5 indicate that this material shows much better selectivities than IFP-1, IFP-2, IFP-3, IFP-4 and IFP-6 with slightly lower selectivity (alpha CO2/CH4) = 4-6. The preferred adsorption of CO2 over CH4 especially of IFP-5 and IFP-4 makes these materials suitable for gas separation application.
Journal of materials chemistry
10.1039/c2jm15811f
0959-9428
wos:2011-2013
WOS:000303442300018
Staudt, R (reprint author), Hsch Offenburg, Fak Maschinenbau & Verfahrenstech, D-77652 Offenburg, Germany., moeller@inc.uni-leipzig.de; reiner.staudt@fh-offenburg.de; arne.thomas@tu-berlin.de; holdt@uni-potsdam.de
Deutsche Forschungsgemeinschaft (DFG) [SPP 1362, STA 428/17-1, HO
1706/6-2]
Franziska Debatin
Jens Möllmer
Suvendu Sekhar Mondal
Karsten Behrens
Andreas Möller
Reiner Staudt
Arne Thomas
Hans-Jürgen Holdt
Institut für Chemie
Referiert