The dielectric response of phenothiazine-based glass-formers with different molecular complexity

Abstract We examined a series of structurally related glass-forming liquids in which a phenothiazine-based tricyclic core (PTZ) was modified by attaching n-alkyl chains of different lengths (n = 4, 8, 10). We systematically disentangled the impact of chemical structure modification on the intermolec...

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Autores principales:	M. Rams-Baron, A. Jędrzejowska, K. Jurkiewicz, M. Matussek, M. Musiał, M. Paluch
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/80146dbf38574ef98c93abefdfea2afd
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spelling	oai:doaj.org-article:80146dbf38574ef98c93abefdfea2afd2021-12-02T17:06:09ZThe dielectric response of phenothiazine-based glass-formers with different molecular complexity10.1038/s41598-021-95127-y2045-2322https://doaj.org/article/80146dbf38574ef98c93abefdfea2afd2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95127-yhttps://doaj.org/toc/2045-2322Abstract We examined a series of structurally related glass-forming liquids in which a phenothiazine-based tricyclic core (PTZ) was modified by attaching n-alkyl chains of different lengths (n = 4, 8, 10). We systematically disentangled the impact of chemical structure modification on the intermolecular organization and molecular dynamics probed by broadband dielectric spectroscopy (BDS). X-ray diffraction (XRD) patterns evidenced that all PTZ-derivatives are not ‘ordinary’ liquids and form nanoscale clusters. The chain length has a decisive impact on properties, exerting a plasticizing effect on the dynamics. Its elongation decreases glass transition temperature with slight impact on fragility. The increase in the medium-range order was manifested as a broadening of the dielectric loss peak reflected in the lower value of stretching parameter β KWW. A disagreement with the behavior observed for non-associating liquids was found as a deviation from the anti-correlation between the value of β KWW and the relaxation strength of the α-process. Besides, to explain the broadening of loss peak in PTZ with the longest (decyl) chain a slow Debye process was postulated. In contrast, the sample with the shortest alkyl chain and a less complex structure with predominant supramolecular assembly through π–π stacking exhibits no clear Debye-mode fingerprints. The possible reasons are also discussed.M. Rams-BaronA. JędrzejowskaK. JurkiewiczM. MatussekM. MusiałM. PaluchNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Rams-Baron A. Jędrzejowska K. Jurkiewicz M. Matussek M. Musiał M. Paluch The dielectric response of phenothiazine-based glass-formers with different molecular complexity
description	Abstract We examined a series of structurally related glass-forming liquids in which a phenothiazine-based tricyclic core (PTZ) was modified by attaching n-alkyl chains of different lengths (n = 4, 8, 10). We systematically disentangled the impact of chemical structure modification on the intermolecular organization and molecular dynamics probed by broadband dielectric spectroscopy (BDS). X-ray diffraction (XRD) patterns evidenced that all PTZ-derivatives are not ‘ordinary’ liquids and form nanoscale clusters. The chain length has a decisive impact on properties, exerting a plasticizing effect on the dynamics. Its elongation decreases glass transition temperature with slight impact on fragility. The increase in the medium-range order was manifested as a broadening of the dielectric loss peak reflected in the lower value of stretching parameter β KWW. A disagreement with the behavior observed for non-associating liquids was found as a deviation from the anti-correlation between the value of β KWW and the relaxation strength of the α-process. Besides, to explain the broadening of loss peak in PTZ with the longest (decyl) chain a slow Debye process was postulated. In contrast, the sample with the shortest alkyl chain and a less complex structure with predominant supramolecular assembly through π–π stacking exhibits no clear Debye-mode fingerprints. The possible reasons are also discussed.
format	article
author	M. Rams-Baron A. Jędrzejowska K. Jurkiewicz M. Matussek M. Musiał M. Paluch
author_facet	M. Rams-Baron A. Jędrzejowska K. Jurkiewicz M. Matussek M. Musiał M. Paluch
author_sort	M. Rams-Baron
title	The dielectric response of phenothiazine-based glass-formers with different molecular complexity
title_short	The dielectric response of phenothiazine-based glass-formers with different molecular complexity
title_full	The dielectric response of phenothiazine-based glass-formers with different molecular complexity
title_fullStr	The dielectric response of phenothiazine-based glass-formers with different molecular complexity
title_full_unstemmed	The dielectric response of phenothiazine-based glass-formers with different molecular complexity
title_sort	dielectric response of phenothiazine-based glass-formers with different molecular complexity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/80146dbf38574ef98c93abefdfea2afd
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The dielectric response of phenothiazine-based glass-formers with different molecular complexity

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