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Reorientational dynamics of trimethoxyboroxine : A molecular glass former studied by dielectric spectroscopy and B-11 nuclear magnetic resonance

Title data

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 B-11 nuclear magnetic resonance.
In: The Journal of Chemical Physics. Vol. 152 (January 2020) Issue 3 . - No. 034503.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.5129769

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000519816800002
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III > Chair Inorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 28 May 2020 08:58
Last Modified: 28 May 2020 08:58
URI: https://eref.uni-bayreuth.de/id/eprint/55268