Investigation of the Effect of Temperature, Salt and Solvent Composition on the Micellization Behavior of Tetradecyltrimethylammonium Bromide in the Presence of the Antibiotic Drug Levofloxacin Hemihydrate
Journal of Solution Chemistry, ISSN: 0095-9782, Vol: 48, Issue: 2, Page: 105-124
2019
- 15Citations
- 16Captures
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Article Description
Interactions of the fluoroquinolone antibiotic drug levofloxacin hemihydrate (LFH) with tetradecyltrimethylammonium bromide (TTAB) were studied in water and in the presence of additives sodium chloride (NaCl) and ethanol (C H OH) at 303.15 to 323.15 K with an interval of 5 K. Only one critical micelle concentration (c ) was obtained for TTAB in water. However, three different critical micelle concentrations c1∗ (first break), c2∗ (second break, and c3∗ (third break) were observed for LFH + TTAB mixtures in all the cases. The c values for (TTAB + LFH) mixtures in the presence of sodium chloride (NaCl) were lower than those in water. On the contrary, the micellization of TTAB was disfavored by the presence of ethanol and the values of c for (TTAB + LFH) mixed systems were higher than those in water. The micellization was almost enthalpy controlled for (TTAB + LFH) systems in water, and in the aqueous C H OH and NaCl solutions but at some temperatures it became both entropy and enthalpy controlled. The standard state Gibbs energy of transfer (ΔtrGm∘), enthalpy of transfer (ΔtrHm∘) and entropy of transfer (ΔtrSm∘) were also determined and are discussed in detail. TTAB and LFH + TTAB systems exhibit excellent enthalpy–entropy compensation in all the cases.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85061757720&origin=inward; http://dx.doi.org/10.1007/s10953-019-00850-w; http://link.springer.com/10.1007/s10953-019-00850-w; http://link.springer.com/content/pdf/10.1007/s10953-019-00850-w.pdf; http://link.springer.com/article/10.1007/s10953-019-00850-w/fulltext.html; https://dx.doi.org/10.1007/s10953-019-00850-w; https://link.springer.com/article/10.1007/s10953-019-00850-w
Springer Science and Business Media LLC
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