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Abstract
Porous materials are ubiquitous systems with a large variety of applications from catalysis to polymer science, from soil to life science, from separation to building materials. Many relevant systems of biological or synthetic origin exhibit a hierarchy, defined as spatial organization over several length scales. Their characterization is often elusive, since many techniques can only be employed to probe a single length scale, like the nanometric or the micrometric levels. Moreover, some multiscale systems lack tridimensional order, further reducing the possibilities of investigation. 129Xe nuclear magnetic resonance (NMR) provides a unique and comprehensive description of multiscale porous materials by exploiting the adsorption and diffusion of xenon atoms. NMR parameters like chemical shift, relaxation times, and diffusion coefficient allow the probing of structures from a few angstroms to microns at the same time. Xenon can evaluate the size and shape of a variety of accessible volumes such as pores, layers, and tunnels, and the chemical nature of their surface. The dynamic nature of the probe provides a simultaneous exploration of different scales, informing on complex features such as the relative accessibility of different populations of pores. In this review, the basic principles of this technique will be presented along with some selected applications, focusing on its ability to characterize multiscale materials.
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Farina M, Mauri M, Patriarca G, Simonutti R, Klasson KT, Cheng HN. 129Xe NMR studies of morphology and accessibility in porous biochar from almond shells. RSC Adv 2016. [DOI: 10.1039/c6ra18104j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
129Xe NMR EXSY plot demonstrating pore connectivity in sustainable almond shell biochar generated from anaerobic thermal activation and rainwater washing.
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Affiliation(s)
- M. Farina
- Department of Materials Science
- University of Milan-Bicocca
- 20125 Milan
- Italy
| | - M. Mauri
- Department of Materials Science
- University of Milan-Bicocca
- 20125 Milan
- Italy
- INSTM
| | - G. Patriarca
- Department of Materials Science
- University of Milan-Bicocca
- 20125 Milan
- Italy
| | - R. Simonutti
- Department of Materials Science
- University of Milan-Bicocca
- 20125 Milan
- Italy
- INSTM
| | - K. T. Klasson
- USDA Agricultural Research Service
- Southern Regional Research Center
- New Orleans
- USA
| | - H. N. Cheng
- USDA Agricultural Research Service
- Southern Regional Research Center
- New Orleans
- USA
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Abstract
Combined GCMC and MD simulations have been used to investigate the adsorption and diffusion of Xe gases in carbon nanotubes (CNTs) at different conditions.
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Affiliation(s)
- Wanling Shen
- College of Chemistry and Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P. R. China
| | - Xin Li
- College of Chemistry and Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P. R. China
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Radula-Janik K, Kupka T. 3He NMR studies on helium-pyrrole, helium-indole, and helium-carbazole systems: a new tool for following chemistry of heterocyclic compounds. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:103-109. [PMID: 25228253 DOI: 10.1002/mrc.4141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 08/04/2014] [Accepted: 08/08/2014] [Indexed: 06/03/2023]
Abstract
The (3)He nuclear magnetic shieldings were calculated for free helium atom and He-pyrrole, He-indole, and He-carbazole complexes. Several levels of theory, including Hartree-Fock (HF), Second-order Møller-Plesset Perturbation Theory (MP2), and Density Functional Theory (DFT) (VSXC, M062X, APFD, BHandHLYP, and mPW1PW91), combined with polarization-consistent pcS-2 and aug-pcS-2 basis sets were employed. Gauge-including atomic orbital (GIAO) calculated (3)He nuclear magnetic shieldings reproduced accurately previously reported theoretical values for helium gas. (3)He nuclear magnetic shieldings and energy changes as result of single helium atom approaching to the five-membered ring of pyrrole, indole, and carbazole were tested. It was observed that (3)He NMR parameters of single helium atom, calculated at various levels of theory (HF, MP2, and DFT) are sensitive to the presence of heteroatomic rings. The helium atom was insensitive to the studied molecules at distances above 5 Å. Our results, obtained with BHandHLYP method, predicted fairly accurately the He-pyrrole plane separation of 3.15 Å (close to 3.24 Å, calculated by MP2) and yielded a sizable (3)He NMR chemical shift (about -1.5 ppm). The changes of calculated nucleus-independent chemical shifts (NICS) with the distance above the rings showed a very similar pattern to helium-3 NMR chemical shift. The ring currents above the five-membered rings were seen by helium magnetic probe to about 5 Å above the ring planes verified by the calculated NICS index.
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Sensitivity of 3He NMR Parameters to the Proximity of Heterocyclic Rings. The Helium–Furan Dimer. Chem Heterocycl Compd (N Y) 2014. [DOI: 10.1007/s10593-014-1490-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bonhomme C, Gervais C, Laurencin D. Recent NMR developments applied to organic-inorganic materials. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 77:1-48. [PMID: 24411829 DOI: 10.1016/j.pnmrs.2013.10.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/17/2013] [Indexed: 06/03/2023]
Abstract
In this contribution, the latest developments in solid state NMR are presented in the field of organic-inorganic (O/I) materials (or hybrid materials). Such materials involve mineral and organic (including polymeric and biological) components, and can exhibit complex O/I interfaces. Hybrids are currently a major topic of research in nanoscience, and solid state NMR is obviously a pertinent spectroscopic tool of investigation. Its versatility allows the detailed description of the structure and texture of such complex materials. The article is divided in two main parts: in the first one, recent NMR methodological/instrumental developments are presented in connection with hybrid materials. In the second part, an exhaustive overview of the major classes of O/I materials and their NMR characterization is presented.
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Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.
| | - Christel Gervais
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR5253, CNRS UM2 UM1 ENSCM, CC1701, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
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Kupka T, Stachów M, Nieradka M, Radula-Janik K, Stobiński L, Kaminský J. From small to medium and beyond: a pragmatic approach in predicting properties of Ne containing structures. Mol Phys 2013. [DOI: 10.1080/00268976.2013.848301] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kupka T, Nieradka M, Kaminský J, Stobiński L. Modeling 21Ne NMR parameters for carbon nanosystems. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:676-681. [PMID: 23970499 DOI: 10.1002/mrc.3999] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 06/18/2013] [Accepted: 07/18/2013] [Indexed: 06/02/2023]
Abstract
The potential of nuclear magnetic resonance (NMR) technique in probing the structure of porous systems including carbon nanostructures filled with inert gases is analysed theoretically using accurate calculations of neon ((21) Ne) nuclear magnetic shieldings. The CBS estimates of (21) Ne NMR parameters were performed for single atom, its dimer and neon interacting with acetylene, ethylene and 1,3-cyclopentadiene. Several levels of theory including restricted Hartree-Fock (RHF), Møller-Plesset perturbation theory to the second order (MP2), density functional theory (DFT) with van Voorhis and Scuseria's t-dependent gradient-corrected correlation functional (VSXC), coupled cluster with single and doubles excitations (CCSD), with single, doubles and triples included in a perturbative way (CCSD(T)) and single, doubles and tripes excitations (CCSDT) combined with polarization-consistent aug-pcS-n series of basis sets were employed. The impact of neon confinement inside selected fullerene cages used as an NMR probe was studied at the RHF/pcS-2 level of theory. A sensitivity of neon probe to the proximity of multiple CC bonds in C2 H2 , C2 H4 , C5 H6 and inside C28 , C30 , C32 , C34 and C60 fullerenes was predicted from (21) Ne NMR parameters' changes. Copyright © 2013 John Wiley & Sons, Ltd.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland
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Kupka T, Stachów M, Chełmecka E, Pasterny K, Stobińska M, Stobiński L, Kaminský J. Efficient Modeling of NMR Parameters in Carbon Nanosystems. J Chem Theory Comput 2013; 9:4275-86. [DOI: 10.1021/ct4002812] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Teobald Kupka
- University of Opole, Faculty of Chemistry,
48, Oleska Street, 45-052 Opole, Poland
| | - Michał Stachów
- University of Opole, Faculty of Chemistry,
48, Oleska Street, 45-052 Opole, Poland
| | - Elżbieta Chełmecka
- Division of Statistics, Department
of Instrumental Analysis, Medical University of Silesia, 30 Ostrogórska Street, 41-200 Sosnowiec, Poland
| | - Karol Pasterny
- A. Chełkowski Institute of
Physics, University of Silesia, 4 Uniwersytecka
Street, 40-007 Katowice, Poland
| | - Magdalena Stobińska
- Institute of Theoretical Physics and Astrophysics, University of Gdańsk, 57 Wita Stwosza Street, 80-952 Gdańsk,
Poland
- Institute of Physics, Polish Academy of Sciences, 32/46, al. Lotników,
02-668 Warsaw, Poland
| | - Leszek Stobiński
- Institute
of Physical Chemistry, Polish Academy of Sciences, 44/52 Kasprzaka Street, 01-224 Warsaw, Poland
| | - Jakub Kaminský
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo Nam. 2., 166
10 Prague, Czech Republic
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Kupka T, Chełmecka E, Pasterny K, Stachów M, Stobiński L. DFT calculations of structures, (13)C NMR chemical shifts, and Raman RBM mode of simple models of small-diameter zigzag (4,0) carboxylated single-walled carbon nanotubes. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2012; 50:142-151. [PMID: 22354820 DOI: 10.1002/mrc.2874] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 11/17/2011] [Accepted: 11/21/2011] [Indexed: 05/31/2023]
Abstract
Linearly conjugated benzene rings (acenes), belt-shaped molecules (cyclic acenes), and models of single-walled carbon nanotubes (SWCNTs) with one carboxylic group at the open end were fully optimized at the B3LYP/6-31G* level of theory. These models were selected to obtain some insight into the nuclear isotropic changes resulting from systematically increasing the basic building units of open-tip-monocarboxylated SWCNTs. In addition, the position of radial breathing mode (RBM), empirically correlated with the SWCNT diameter, was directly related with the radius of model cyclic acene rings. A regular convergence of selected structural, NMR, and Raman parameters with the molecular system size increase was observed, and a simple two-parameter mathematical formula enabled their estimation in infinity. The predicted (13) C NMR chemical shifts of carbon atoms close to the substituted rim of carboxylated models of zigzag (4,0) SWCNTs differed significantly from the pristine nanotubes.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052, Opole, Poland
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Kupka T, Stachów M, Nieradka M, Stobiński L. DFT calculation of structures and NMR chemical shifts of simple models of small diameter zigzag single wall carbon nanotubes (SWCNTs). MAGNETIC RESONANCE IN CHEMISTRY : MRC 2011; 49:549-557. [PMID: 21815210 DOI: 10.1002/mrc.2777] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Revised: 05/04/2011] [Accepted: 05/09/2011] [Indexed: 05/31/2023]
Abstract
Linearly conjugated benzene rings (acenes), belt-shape molecules (cyclic acenes) and model single wall carbon nanotubes (SWCNTs) were fully optimized at the unrestricted level of density functional theory (UB3LYP/6-31G*). The models of SWCNTs were selected to get some insight into the potential changes of NMR chemical shift upon systematic increase of the molecular size. The theoretical NMR chemical shifts were calculated at the B3LYP/pcS-2 level of theory using benzene as reference. In addition, the change of radial breathing mode (RBM), empirically correlated with SWCNT diameter, was directly related with the radius of cyclic acenes. Both geometrical and NMR parameters were extrapolated to infinity upon increase in the studied systems size using a simple two-parameter mathematical formula. Very good agreement between calculated and available experimental CC bond lengths of acenes was observed (RMS of 0.0173 Å). The saturation of changes in CC bond lengths and (1)H and (13)C NMR parameters for linear and cyclic acenes, starting from 7-8 conjugated benzene rings, was observed. The (13)C NMR parameters of individual carbon atoms from the middle of ultra-thin (4,0) SWCNT formed from 10 conjugated cyclic acenes differ by about 130 ppm from the corresponding open end carbon nuclei.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052 Opole, Poland.
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Kibalchenko M, Payne MC, Yates JR. Magnetic response of single-walled carbon nanotubes induced by an external magnetic field. ACS NANO 2011; 5:537-545. [PMID: 21171576 DOI: 10.1021/nn102590b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Using first-principles density functional calculations, magnetically induced currents are obtained for zigzag single-walled carbon nanotubes. Clear differences and trends in current flow are observed between the different nanotube families. In particular, for a magnetic field applied along the tube axis, the current response of the λ = 0 infinite nanotubes is paramagnetic, whereas for λ = 1 and 2 nanotubes, the response is diamagnetic. The results are used to predict and interpret the significant changes in NMR properties for small molecules encapsulated inside a tube.
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Affiliation(s)
- Mikhail Kibalchenko
- TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom.
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Stupic KF, Cleveland ZI, Pavlovskaya GE, Meersmann T. Hyperpolarized (131)Xe NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 208:58-69. [PMID: 21051249 PMCID: PMC3160776 DOI: 10.1016/j.jmr.2010.10.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2010] [Revised: 08/08/2010] [Accepted: 10/05/2010] [Indexed: 05/11/2023]
Abstract
Hyperpolarized (hp) (131)Xe with up to 2.2% spin polarization (i.e., 5000-fold signal enhancement at 9.4 T) was obtained after separation from the rubidium vapor of the spin-exchange optical pumping (SEOP) process. The SEOP was applied for several minutes in a stopped-flow mode, and the fast, quadrupolar-driven T(1) relaxation of this spin I = 3/2 noble gas isotope required a rapid subsequent rubidium removal and swift transfer into the high magnetic field region for NMR detection. Because of the xenon density dependent (131)Xe quadrupolar relaxation in the gas phase, the SEOP polarization build-up exhibits an even more pronounced dependence on xenon partial pressure than that observed in (129)Xe SEOP. (131)Xe is the only stable noble gas isotope with a positive gyromagnetic ratio and shows therefore a different relative phase between hp signal and thermal signal compared to all other noble gases. The gas phase (131)Xe NMR spectrum displays a surface and magnetic field dependent quadrupolar splitting that was found to have additional gas pressure and gas composition dependence. The splitting was reduced by the presence of water vapor that presumably influences xenon-surface interactions. The hp (131)Xe spectrum shows differential line broadening, suggesting the presence of strong adsorption sites. Beyond hp (131)Xe NMR spectroscopy studies, a general equation for the high temperature, thermal spin polarization, P, for spin I ≥ 1/2 nuclei is presented.
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Affiliation(s)
- Karl F. Stupic
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States
- University of Nottingham, School of Clinical Sciences, Sir Peter Mansfield Magnetic Resonance Centre, Nottingham NG7 2RD, United Kingdom
| | - Zackary I. Cleveland
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States
| | - Galina E. Pavlovskaya
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States
- University of Nottingham, School of Clinical Sciences, Sir Peter Mansfield Magnetic Resonance Centre, Nottingham NG7 2RD, United Kingdom
| | - Thomas Meersmann
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States
- University of Nottingham, School of Clinical Sciences, Sir Peter Mansfield Magnetic Resonance Centre, Nottingham NG7 2RD, United Kingdom
- Corresponding author at: University of Nottingham, Sir Peter Mansfield Magnetic Resonance Centre, Nottingham NG7 2RD, United Kingdom. Fax: +44 (0) 115 9515166.
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Marega R, Aroulmoji V, Dinon F, Vaccari L, Giordani S, Bianco A, Murano E, Prato M. Diffusion-Ordered NMR Spectroscopy in the Structural Characterization of Functionalized Carbon Nanotubes. J Am Chem Soc 2009; 131:9086-93. [DOI: 10.1021/ja902728w] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Riccardo Marega
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Vincent Aroulmoji
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Francesca Dinon
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Lisa Vaccari
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Silvia Giordani
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Alberto Bianco
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Erminio Murano
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
| | - Maurizio Prato
- Center of Excellence for Nanostructured Materials (CENMAT), Dipartimento di Scienze Farmaceutiche and INSTM UdR Trieste, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy, Protos Research Institute, Via Flavia 23/1, c/o Sviluppo Italia, 34148, Trieste, Italy, Polymer Conjugation Department, EURAND S.p.A, Area Science Park, Padriciano 99, 34127 Trieste, Italy, Synchrotron ELETTRA Trieste, SISSI beamline, Area Science Park, Basovizza, 34127 Trieste, Italy, School of Chemistry,
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Romanenko KV, Lapina OB, Kuznetsov VL, Fraissard J. Potential of 129Xe NMR spectroscopy of adsorbed xenon for testing the chemical state of the surface of mesoporous carbon materials illustrated by the example of aggregates of diamond and onion-like carbon nanoparticles. KINETICS AND CATALYSIS 2009. [DOI: 10.1134/s0023158409010042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Romanenko KV, Lapina OB, Py X, Fraissard J. 129Xe NMR spectroscopy of adsorbed xenon: Possibilites for exploration of microporous carbon materials. RUSS J GEN CHEM+ 2008. [DOI: 10.1134/s1070363208110388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sebastiani D, Kudin KN. Electronic response properties of carbon nanotubes in magnetic fields. ACS NANO 2008; 2:661-668. [PMID: 19206596 DOI: 10.1021/nn700147w] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Magnetic linear response properties for achiral and chiral carbon nanotubes were investigated with first-principles electronic structure methods. We have computed the magnetic shielding inside and outside the tubes originating from electronic current densities induced by the application of an external magnetic field. This electronic response of the nanotubes was analyzed for external magnetic fields both parallel and perpendicular to the tube axis. The magnetic screening would be experienced by guest molecules inside the tubes, measurable by NMR spectroscopy on isotopically labeled samples. Special attention is given to chiral nanotubes, in which longitudinal fields induce a non-zero longitudinal current density and thus tangential magnetic fields outside the tubes.
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Affiliation(s)
- Daniel Sebastiani
- Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
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Böhlmann W, Pöppl A, Sabo M, Kaskel S. Characterization of the Metal−Organic Framework Compound Cu3(benzene 1,3,5-tricarboxylate)2by Means of129Xe Nuclear Magnetic and Electron Paramagnetic Resonance Spectroscopy. J Phys Chem B 2006; 110:20177-81. [PMID: 17034193 DOI: 10.1021/jp063074r] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
129Xe NMR measurements of adsorbed xenon are shown for the first time to be a suitable tool to characterize the porosity and the properties of the metal-organic framework Cu3(BTC)2(H2O)3 (BTC = benzene 1,3,5-tricarboxylate). The NMR experiments are performed at room temperature and over a wide range of xenon pressure and on two different synthesized Cu3(BTC)2 samples. 129Xe NMR results reveal that in dependence on the kind of the synthesis pathway either one or two signals are observed which can be attributed to two kinds of fast exchange of xenon atoms in two pores with different pore sizes. Coadsorption experiments of xenon and ethylene demonstrate that the xenon atoms prefer to fill the greater pores of the material because the smaller pores are occupied with residual molecules from the synthesis procedure and additionally adsorbed ethylene. Besides the NMR experiments a series of electron paramagnetic resonance (EPR) measurements are performed to estimate the state of copper having a strong influence on the chemical shift of the adsorbed xenon. The EPR experiments demonstrate that spin exchange between the interconnected copper dimers is taking place across the BTC linker molecules in the Cu3(BTC)2 framework.
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Affiliation(s)
- Winfried Böhlmann
- Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstr. 5, D-04103 Leipzig, Germany.
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