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Hoffmann, Lars ; Beerwerth, Joachim ; Greim, Dominik ; Senker, Jürgen ; Sternemann, Christian ; Hiller, Wolf ; Böhmer, Roland:
Reorientational dynamics of trimethoxyboroxine : A molecular glass former studied by dielectric spectroscopy and ¹¹B nuclear magnetic resonance.
In: The Journal of Chemical Physics.
Bd. 152
(2020)
Heft 3
.
- 034503.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.5129769
Abstract
In this work, trimethoxyboroxine (TMB) is identified as a small-molecule glass former. In its viscous liquid as well as glassy states, static and dynamic properties of TMB are explored using various techniques. It is found that, on average, the structure of the condensed TMB molecules deviates from threefold symmetry so that TMB's electric dipole moment is nonzero, thus rendering broadband dielectric spectroscopy applicable. This method reveals the super-Arrhenius dynamics that characterizes TMB above its glass transition, which occurs at about 204 K. To extend the temperature range in which the molecular dynamics can be studied, B-11 nuclear magnetic resonance experiments are additionally carried out on rotating and stationary samples: Exploiting dynamic second-order shifts, spin-relaxation times, line shape effects, as well as stimulated-echo and two-dimensional exchange spectroscopy, a coherent picture regarding the dynamics of this glass former is gained.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | ISI:000519816800002 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III > Lehrstuhl Anorganische Chemie III - Univ.-Prof. Dr. Jürgen Senker Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 28 Mai 2020 08:58 |
| Letzte Änderung: | 06 Jul 2023 12:20 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/55268 |