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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:
It is part of: Helvetica Chimica Acta, 2008, vol. 91, num. 7, p. 1286-1298
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ISSN: 0018-019X
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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