Abstract
Using potentiometric measurements, dissociation constants of two Schiff bases, N,N′-bis(1′-hydroxy-2′-acetonaphthone)propylenediimine (L1) and bis(1′-hydroxy-2′-acetonaphthone)-3,3′-diiminodpropaneamine (L2) were determined in binary mixtures of tetrahydrofuran-water at 25.0 ± 0.1°C and an ionic strength of 0.100 M tetrabutylammonium perchlorate (TBAP). The results show that the pK a values of these acids increases as the percentages of the tetrahydrofuran increase in solvent mixtures. There is a linear relationship between acidity constants and the mole fraction of tetrahydrofuran in the solvent mixtures. Effect of solvent composition on acidity constants is also discussed.
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References
Zhao, Y.H., Yuan, L.H., and Wang, L.S., Bull. Environ. Contam. Toxicol., 1996, vol. 57, p. 242.
Rochester, H., Acidity Functions, New York: Academic, 1971.
Hammet, L.P., Physical Organic Chemistry, New York: McGraw-Hill, 1940.
Abbaspour, A. and Kamyabi, M.A., J. Chem. Eng. Data, 2001, vol. 46, p. 623.
Abbaspour, A., Kamyabi, M.A., Khalafi-Nezhad, A., and Soltani, Rad, M.N., J. Chem. Eng. Data, 2003, vol. 48, p. 911.
Abbaspour, A., Kamyabi, M.A., Khalafi-Nezhad, A., and Soltani, Rad, M.N., J. Chem. Eng. Data, 2004, vol. 49, p. 907.
Baggesgaard-Rasmussen, H., Z. Analyt. Chem., 1936, vol. 105, p. 269.
Palit, S.R., Ind. Eng. Chem. Anal. Ed., 1946, vol. 18, p. 246.
Chmurzynski, L. and Warnke, Z., Aust. J. Chem., 1993, vol. 46, p. 185.
Casellato, U. and Vigato, P.A., Coord. Chem. Rev., 1977, vol. 23, p. 31.
Dey, K., Biswas, A.K., and Roy, A., Indian J. Chem., A, 1981, vol. 20, p. 848.
Liu, L., Masuda, Y., and Sekido, E., Bull. Chem. Soc. Jpn., 1990, vol. 63, p. 2516.
Macrocyclic Compounds in Analytical Chemistry, Zolotov, Yu.A., Ed., New York: Wiley, 1997.
Louloudi, M., Nastopoulos, V., Gourbatsis, S., Perlepes, S.P., and Hadjiliadis, N., Inorg. Chem. Commun., 1999, vol. 2, p. 479.
Kormali, E. and Kilic, E., Talanta, 2002, vol. 58, p. 793.
Ben-Saber, S.M., Maihub, A.A., Hudere, S.S., and El-Ajaily, M.M., Microchem. J., 2005, vol. 81, p. 191.
Martell, A.E. and Motekaitis, R.J., Determination and Use of Stability Constants, New York: VCH, 1992, 2nd ed.
Abbaspour, A. and Kamyabi, M.A., Anal. Chim. Acta, 2004, vol. 512, p. 257.
Emadi, D., Yaftian, M.R., and Rayati, S., Turk. J. Chem., 2007, vol. 31, p. 423.
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Kamyabi, M.A. Potentiometric determination of acidity constants of some Schiff bases in tetrahydrofuran-water mixtures. J Anal Chem 64, 1131–1135 (2009). https://doi.org/10.1134/S1061934809110070
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DOI: https://doi.org/10.1134/S1061934809110070