We measured the anelastic spectrum of two organic molecules, calix[4]arene and p-tert-but-calix[4]arene. In both samples, a peak observed around 45-60 K for a measurement frequency of about 1 kHz was ascribed to the hopping of H atoms of the O-H groups, due to the close similarity of the physical parameters of these peaks with those obtained by a NMR relaxometry study. The present results reveal that anelastic spectroscopy is a good tool for studying atomic motion inside molecules at a mesoscopic level. (C) 2003 Elsevier B.V. All rights reserved.
Anelastic processes in calix[n]arene-type organic molecules / A., Paolone; Cantelli, Rosario. - In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. - ISSN 0921-5093. - 370:1-2(2004), pp. 105-108. (Intervento presentato al convegno 13th International Conference on Internal Friction and Ultrasonic Attentuation in Solids tenutosi a Bilbao, SPAIN nel JUL 08-12, 2002) [10.1016/j.msea.2003.08.087].
Anelastic processes in calix[n]arene-type organic molecules
CANTELLI, Rosario
2004
Abstract
We measured the anelastic spectrum of two organic molecules, calix[4]arene and p-tert-but-calix[4]arene. In both samples, a peak observed around 45-60 K for a measurement frequency of about 1 kHz was ascribed to the hopping of H atoms of the O-H groups, due to the close similarity of the physical parameters of these peaks with those obtained by a NMR relaxometry study. The present results reveal that anelastic spectroscopy is a good tool for studying atomic motion inside molecules at a mesoscopic level. (C) 2003 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
