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https://hdl.handle.net/2445/160417
Title: | Decanedioic acid (C10H18O4) - Dodecanedioic acid (C12H22O4) system: polymorphism of the components and experimental phase diagram |
Author: | Ventolà, L. Bayés-García, Laura Benages Vilau, Raúl Novegil González-Anleo, Francisco Javier Cuevas Diarte, Miguel Ángel Calvet Pallàs, Maria Teresa Mondieig, Denise, 1958- |
Keywords: | Polimorfisme (Cristal·lografia) Polymorphism (Crystallography) |
Issue Date: | Jul-2008 |
Publisher: | Verlag Helvetica Chimica Acta |
Abstract: | The experimental temperature/composition phase diagram of the binary system decanedioic acid (C10H18O4)/dodecanedioic acid (C12H22O4) was established by combining X-ray powder diffraction (XRD), differential-scanning calorimetry (DSC), infrared spectroscopy (IR), scanning electron microscopy (SEM), and thermo-optical microscopy (TOM). Both compounds crystallize in the same ordered form, C (P21/c), which is the phase that melts in both cases. The C form melts in C12H22O4 earlier than in C10H18O4 , in contrast to other unbranched-chain compounds (alkanes, alkanols, and alkanoic acids) in which the melting temperatures increase as the C-atom number rises. Contrary to what might be expected, total solid-state miscibility is not observed. The C10H18O4/C12H22O4 binary system shows a complex phase diagram. At low temperatures, a new monoclinic form, Ci (P21/c), stabilizes as a result of the disorder of composition in the mixed samples; two [C þ Ci] domains appear. Upon heating, four solid - solid and seven solid - liquid domains appear related by eutectic and peritectic invariants. All the crystallographic forms observed are isostructural. |
Note: | Versió preprint del document publicat a: https://doi.org/10.1002/hlca.200890140 |
It is part of: | Helvetica Chimica Acta, 2008, vol. 91, num. 7, p. 1286-1298 |
URI: | https://hdl.handle.net/2445/160417 |
Related resource: | https://doi.org/10.1002/hlca.200890140 |
ISSN: | 0018-019X |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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