Micellar effects in the kinetics of reaction between phenolphthalein and hydroxide ion. (2) The effect of cationic and zwitterionic surfactants
Abstract
The rate constants of the interaction of phenolphthalein (PP) with hydroxide ion in the systems containing: ethanol – CTAB (cetyltrimethylammonium bromide, cationic surfactant), ethanol – DMDAPS (3-(dimethyldodecylammonio)-propanesulfonate, zwitterionic surfactant), Brij-35 – CTAB, Brij-35 – DMDAPS, Triton X-100 – CTAB, Triton X-100 – DMDAPS are determined at different concentrations of surfactants. It has been found that the influence of the surfactants concentrations on the rate of reaction in general are the same. The increasing of surfactant concentration in solution near the critical micelle concentration leads to the abrupt decreasing of the rate constant of dye fading reaction, and after reaching the CMC it stays almost constant. It also has been found that near the CMC region of CTAB and DMDAPS the initial absorbance of solutions is less than without these surfactants. This fact has been explained by the fast tautomeric transformation of the dye from quinoid to lactone form and it is not connected with alkaline fading reaction.
Downloads
References
Roshchina E.V. Micellyarny'e effekty v kinetike reakcii vzaimodeystviya phenolphthalein s gidroksid ionom. (1) Vliyanie neionogenny'h i anionny'h PAV / Roshchina E.V., Eltsov S.V. // Visn. Hark. nac. univ. 2013. № 1085. Ser. Him. Issue 22 (45). P. 119-126 [in Russian]
Barnes M. D., Lamer V. // J. Am. Chem. Soc. – 1942. – Vol. 64, No. 10. – P. 2312–2316.
Chen D T. Y., Laidler K. J. // Can. J. Chem. – 1959. – Vol. 37, No. 3. – P. 599-642.
Mao Sh., Chen Zh., An X., Shen W. // J. Phys. Chem A. – 2011. – Vol. 115, No. 22. – P. 5560–5567.
Mao Sh., Chen Zh., Fan D., An X., Shen W. // J. Phys. Chem A. – 2012. – Vol. 116, No. 2. – P. 158–165.
Duynstee E. F. G., Grunwald E. // J. Am. Chem. Soc. – 1959. – Vol. 81, No. 17. – P. 4540-4548.
Sabnis R. W. Handbook of acid-base indicators. CRC Press, 2005. – 398 p.
Berezin I. V., Martinek K., Yatsimirskiy A. K. // Uspehi himii. – 1973. – Vol. 52, No. 10. – P. 1729-1756. [in Russian]
Khan M. N. Micellar catalysis. – Boca Raton: CRC Press, 2007. – 482 p.
Bogdanova L. N. Vzaimodeystvie krasiteley s makrociklicheskimi reagentami v vodny'h rast-vorah: dis...kand. him. nauk: 02.00.04 / Bogdanova Larisa Nikolaevna. – Har'kov, 2011. – 206 s. [in Russian]
