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Poryvaev AS, Gjuzi E, Yazikova AA, Polyukhov DM, Albrekht YN, Efremov AA, Kudriavykh NA, Yanshole VV, Hoffmann F, Fröba M, Fedin MV. Blatter Radical-Decorated Silica as a Prospective Adsorbent for Selective NO Capture from Air. ACS APPLIED MATERIALS & INTERFACES 2023; 15:5191-5197. [PMID: 36652301 DOI: 10.1021/acsami.2c19183] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Nitrogen oxides are adverse poisonous gases present in the atmosphere and having detrimental effects on the human health and environment. In this work, we propose a new type of mesoporous materials capable of capturing nitrogen monoxide (NO) from air. The designed material combines the robust Santa Barbara Amorphous-15 silica scaffold and ultrastable Blatter-type radicals acting as NO traps. Using in situ electron paramagnetic resonance spectroscopy, we demonstrate that NO capture from air is selective and reversible at practical conditions, thus making Blatter radical-decorated silica highly promising for environmental applications.
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Affiliation(s)
- Artem S Poryvaev
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Eva Gjuzi
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Anastasiya A Yazikova
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | - Daniil M Polyukhov
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Yana N Albrekht
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | - Aleksandr A Efremov
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | | | - Vadim V Yanshole
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Frank Hoffmann
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Michael Fröba
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Matvey V Fedin
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
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de Oliveira M, Herr K, Brodrecht M, Haro-Mares NB, Wissel T, Klimavicius V, Breitzke H, Gutmann T, Buntkowsky G. Solvent-free dynamic nuclear polarization enhancements in organically modified mesoporous silica. Phys Chem Chem Phys 2021; 23:12559-12568. [PMID: 34027938 DOI: 10.1039/d1cp00985k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
High-field dynamic nuclear polarization is a powerful tool for the structural characterization of species on the surface of porous materials or nanoparticles. For these studies the main source of polarization are radical-containing solutions which are added by post-synthesis impregnation of the sample. Although this strategy is very efficient for a wide variety of materials, the presence of the solvent may influence the chemistry of functional species of interest. Here we address the development of a comprehensive strategy for solvent-free DNP enhanced NMR characterization of functional (target) species on the surface of mesoporous silica (SBA-15). The strategy includes the partial functionalization of the silica surface with Carboxy-Proxyl nitroxide radicals and target Fmoc-Glycine functional groups. As a proof of principle, we have observed for the first time DNP signal enhancements, using the solvent-free approach, for 13C{1H} CPMAS signals corresponding to organic functionalities on the silica surface. DNP enhancements of up to 3.4 were observed for 13C{1H} CPMAS, corresponding to an experimental time save of about 12 times. This observation opens the possibility for the DNP-NMR study of surface functional groups without the need of a solvent, allowing, for example, the characterization of catalytic reactions occurring on the surface of mesoporous systems of interest. For 29Si with direct polarization NMR, up to 8-fold DNP enhancements were obtained. This 29Si signal enhancement is considerably higher than the obtained with similar approaches reported in literature. Finally, from DNP enhancement profiles we conclude that cross-effect is probably the dominant polarization transfer mechanism.
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Affiliation(s)
- Marcos de Oliveira
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany. and São Carlos Institute of Physics, University of São Paulo, PO Box 369, 13560-970, São Carlos, SP, Brazil.
| | - Kevin Herr
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Martin Brodrecht
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Nadia B Haro-Mares
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Till Wissel
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Vytautas Klimavicius
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany. and Institute of Chemical Physics, Vilnius University, Sauletekio av. 3, LT-10257 Vilnius, Lithuania
| | - Hergen Breitzke
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Torsten Gutmann
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
| | - Gerd Buntkowsky
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
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Exner J, Eusterwiemann S, Janka O, Doerenkamp C, Massolle A, Niehaus O, Daniliuc CG, Pöttgen R, Neugebauer J, Studer A, Eckert H. Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts. Phys Chem Chem Phys 2018; 20:28979-28983. [PMID: 30452043 DOI: 10.1039/c8cp05837g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Antiferromagnetic coupling in TEMPO-based radicals can be enhanced via self-assembly through London dispersion interactions in amphiphilic solids. The synthesis, magnetic characterization, and three crystal structures of the solid radical ion salts (R-DMAT-n)X with various counterions X and alkyl chain lengths n are reported. Magnetic susceptibility and absolute EPR signal intensity measurements show singlet-triplet transitions in a number of cases, which is discussed in relation to the crystal structures. Antiferromagnetic ordering effects are sensitive to both the length of the alkyl chain and the counter anion.
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Affiliation(s)
- Jessica Exner
- Organic Chemistry Institute, Westfälische Wilhelms-University Münster, Corrensstrasse 40, 48149 Münster, Germany.
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Eckert H. Advanced Magnetic Resonance Techniques for the Structural Characterization of Aminoxyl Radicals and Their Inorganic-Organic Nanocomposite Systems. Chemistry 2017; 23:5893-5914. [PMID: 27862449 DOI: 10.1002/chem.201604685] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Indexed: 11/10/2022]
Abstract
Electron and nuclear spins are extremely sensitive probes of their local structural and dynamic surroundings. Their Zeeman energy levels are modified by different types of local magnetic and electric fields created by their structural environment, which influence their magnetic resonance condition. For this reason, electron spin resonance (ESR) and nuclear magnetic resonance (NMR) spectroscopies have become extremely powerful tools of structural analysis, which are being widely used for the structural characterization of complex solids. Following a brief introduction into the basic theoretical foundations the most commonly used techniques and their application towards the structural characterization of paramagnetic solids based on aminoxyl radicals and their inorganic-organic nanocomposites will be described. Both ESR and NMR observables are useful for monitoring intermolecular interactions between unpaired electron spins, which are particularly important for the design of organically based ferromagnetic systems. ESR and NMR methods based on this effect can be used for monitoring the synthesis of polynitroxides and for evaluating the catalytic function of aminoxyl intercalation compounds. Finally, the sensitivity of ESR signals to motional dynamics can be exploited for characterizing molecule-surface interactions in nanocomposite systems. In the context of the latter work recently developed signal enhancement strategies are described, using polarization transfer from electron spins to nuclear spins for NMR spectroscopic detection.
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Affiliation(s)
- Hellmut Eckert
- Institut für Physikalische Chemie, WWU Münster, Corrensstraße 30, 48149, Münster, Germany.,Instituto de Física São Carlos, Universidade de São Paulo, CP 369, 13560-970, São Carlos, S.P., Brasil
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