Decanedioic acid (C10H18O4)/dodecanedioic acid (C12H22O4) system:: Polymorphism of the components and experimental phase diagram

被引：10

作者：

Ventola, Lourdes ^{[1
]}

Bayes, Laura ^{[1
]}

Benages, Rauel ^{[1
]}

Javier Novegil-Anleo, Francisco ^{[1
]}

Angel Cuevas-Diarte, Miquel ^{[1
]}

Calvet, Teresa ^{[1
]}

机构：

[1] Univ Barcelona, Dept Cristallog Mineral & Diposits Minerals, Fac Geol, E-08028 Barcelona, Spain

来源：

HELVETICA CHIMICA ACTA | 2008年 / 91卷 / 07期

关键词：

D O I：

10.1002/hlca.200890140

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The experimental temperature/composition phase diagram of the binary system decanectioic 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 (P2(1)/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 tow temperatures, a new monoclinic form, C-i (P2(1)/c), stabilizes as a result of the disorder of composition in the mixed samples; two [C + C-i] 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.

引用

页码：1286 / 1298

页数：13