NDLI: Thermal and structural properties of surfactant–picrate compounds : Effect of the alkyl chain number on the same ammonium head group

Content Provider	Springer Nature Link
Author	Mihelj, Tea Štefanić, Zoran Tomašić, Vlasta
Copyright Year	2011
Abstract	The novel surfactant–picrate compounds were synthesized and characterized by thermal and XRD analysis. The synthesis, based on the electrostatic interactions of components in polar solvents, was carried out using picric acid and cationic surfactants (dodecyltrimethylammonium, didodecyldimethylammonium, and tridodecylmethylammonium halide). The idea was to investigate the dependence of physico-chemical properties and thermal transitions of picrate–surfactant compounds with raising number of dodecyl chains sited on the same ammoniumm head group. The equimolar mixed aqueous solutions are characterized as lyotropic, strongly promoted by picrate anion. The main crystal structure feature of investigated picrates is layered structure with stacked aromatic rings of one picrate molecule on the top of the other one via strong π…π interactions and connection to the alkylammonium molecules with their nitro groups by C–H…O hydrogen bonds. Surfactant–picrate bilayer-like structures are interrupted with layers of polar heads and picrate counterions and the observed width of such a bilayers are functions of more complex structural behaviors which ensures alternation in space of equal numbers of positive and negative charges. Although some of the surfactants used posses thermotropic porperties, like examined tridodecylmethylammonium chloride, no thermotropic mesomorphism is detected in solid state of investigated surfactant–picrate compounds. The thermodynamic parameters of solid–liquid thermal transitions depend linear on the number of dodecyl chains, and for double- and triple-tailed picrate compounds the marked temporal hysteresis of the melt crystallization is registered.
Starting Page	1261
Ending Page	1272
Page Count	12
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	108
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal analysis Alkyl chain number Cationic surfactant Picrate Crystal structure Analytical Chemistry Inorganic Chemistry Measurement Science and Instrumentation Polymer Sciences Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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