Mihelj, Tea; Vojta, Danijela; Tomašić, Vlasta (2014) The diversity in thermal behavior of novel catanionic cholates: the dominant effect of quartenary ammonium centers. Thermochimica Acta, 584 . pp. 17-30. ISSN 0040-6031
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The thermal behavior of novel catanionic compounds based on cholate anion was examined. The study explains the effect of the raising dodecyl chain number, as well as of the raising headgroup number in quaternary ammonium salts on their physico-chemical properties. The examined samples are crystal smectic phases at room temperature. Their rich and diverse thermal behavior is seen through polymorphic phase transitions, thermotropic mesomorphism of smectic nature and in some cases, kinetically managed crystallization that lasts in days. The changes of the cholates keto-enol isomer balance during thermal treatment are obtained. For both groups of samples temperatures of isotropisation and the thermodynamic parameters follow polynomial regression. Introduction of the new dodecyl chain leads to more ordered structure, while implementation the new headgroup leads to advanced polymer-like structure. The obtained results demonstrate an effort for getting and controlling the regularity of the physico-chemical and thermotropic properties for new compounds by systematic changing of cationic part of the molecule. These informations could provide in the future the easiest way for selection of potentially new and targeted applicable materials.
|Uncontrolled Keywords:||cholate anion; infrared spectroscop; nuclear magnetic resonance spectroscopy; smectic; thermotropic|
|Subjects:||NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Chemistry > Physical Chemistry
|Divisions:||Division of Organic Chemistry and Biochemistry
Division of Physical Chemistry
|Depositing User:||Tea Mihelj|
|Date Deposited:||01 Dec 2015 13:03|
|Last Modified:||20 Mar 2016 00:15|
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