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Pregled bibliografske jedinice broj: 516750

Časopis

Autori: Mihelj, Tea; Štefanić, Zoran; Tomašić, Vlasta
Naslov: Thermal and structural properties of surfactant–picrate compounds
( Thermal and structural properties of surfactant–picrate compounds )
Izvornik: Journal of thermal analysis and calorimetry (1388-6150) 108 (2012), 3; 1261-1272
Vrsta rada: članak
Ključne riječi: thermal analysis; alkyl chain number; cationic surfactant; picrate; crystal structure
( thermal analysis; alkyl chain number; cationic surfactant; picrate; crystal structure )
Sažetak:
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 ammonium 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 properties, 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.
Projekt / tema: 098-1191344-2943, 098-0982915-2949
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Kemija
URL Internet adrese: http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s10973-011-1710-7
Broj citata:
Altmetric:
DOI: 10.1007/s10973-011-1710-7
URL cjelovitog teksta:
Google Scholar: Thermal and structural properties of surfactant–picrate compounds
Upisao u CROSBI: tmihelj@irb.hr (tmihelj@irb.hr), 20. Lip. 2011. u 13:30 sati



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