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Issue 54, 2014
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Molecular dynamics of itraconazole confined in thin supported layers

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Abstract

Broadband Dielectric Spectroscopy (BDS) is used to study the molecular dynamics of thin layers of itraconazole – an active pharmaceutical ingredient with rod-like structure and whose Differential Scanning Calorimetry (DSC) scans reveal liquid crystalline-like phase transitions. It is found that (i) the structural relaxation process remains bulk like, within the limits of experimental accuracy, in its mean relaxation rate, while (ii) its shape is governed by two competing events: interfacial interactions, and crystalline ordering. Additionally, (iii) the dynamics of the δ-relaxation – assigned to the flip–flop rotation of the molecule about its short axis – deviates from bulk behaviour as the glass transition is approached for the confined material. These observations are rationalized within the framework of molecular dynamics as currently understood.

Graphical abstract: Molecular dynamics of itraconazole confined in thin supported layers

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Article information


Submitted
21 Feb 2014
Accepted
17 Jun 2014
First published
18 Jun 2014

This article is Open Access

RSC Adv., 2014,4, 28432-28438
Article type
Paper
Author version available

Molecular dynamics of itraconazole confined in thin supported layers

E. U. Mapesa, M. Tarnacka, E. Kamińska, K. Adrjanowicz, M. Dulski, W. Kossack, M. Tress, W. K. Kipnusu, K. Kamiński and F. Kremer, RSC Adv., 2014, 4, 28432
DOI: 10.1039/C4RA01544D

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    [Original citation] - Published by The Royal Society of Chemistry.

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