Abstract
We report the results of a comparative study of the properties of three azo dyes from the methyl red indicator family, which were coentrapped with the surfactant cetyltrimethylammonium bromide within tetramethoxysilane-derived silica sol-gel matrices. Characteristic parameters studied were spectral shifts, shifts in indicating ranges and in pKi values, isosbestic-point behavior, changes in the titration curves and stability to leaching. Physical entrapment of methyl red and para-methyl red (pMR) is compared to the covalent entrapment of a trialkoxysilane derivative of methyl red. High stability for leaching was found for all three entrapped indicators. The pKi change in entrapped pMR is interpreted in terms of intracage motion induced by pH changes.
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References
O.S. Wolfbeis, R. Reisfeld, and I. Oehme, Structure and Bonding 85, 52 (1996).
O. Lev, M. Tsionsky, L. Rabinovich, V. Glezer, S. Sampath, I. Pankratov, and J. Gun, Anal. Chem. 67, 22A (1995).
D. Avnir, L.C. Klein, D. Levy, U. Schubert, and A.B. Wojcik, in The Chemistry of Organosilicon Compounds—Part 2, edited by Y. Apeloig and Z. Rappoport (Wiley & Sons, Chichester, 1997), chap. 48.
R. Zusman, C. Rottman, M. Ottolenghi, and D. Avnir, J. Non-Cryst. Solids 122, 107 (1990).
D. Avnir, Acc. Chem. Res. 28(8), 330 (1995).
C. Rottman, M. Ottolenghi, R. Zusman, O. Lev, M. Smith, G. Gong, M.L. Kagan, and D. Avnir, Mater. Lett. 13, 293 (1992).
C.K. Jorgensen and R. Reisfeld, Optical and Electronic Phenomena in Sol-Gel Glasses and Modern Application (Springer, 1996).
R. Gvishi, U. Narang, G. Ruland, D. Kumar, and P. Prasad, Appl. Organomet. Chem. 11, 107 (1997).
F. Nishida, J. McKiernan, B. Dunn, and J. Zink, J. Am. Ceram. Soc. 78, 1640 (1995).
S.C. Kraus, R. Uzolk, J. Reichert, and H.J. Ache, Sens. Actuators B 15/16, 199 (1993).
B.M. Kubeckova, M. Pespisilova, and V.J. Matejec, Sol-Gel Sci. Technol. 2, 513 (1994).
L. Yang and S.S. Saavedra, Anal. Chem. 67, 1307 (1995).
J.Y. Ding, M.R. Shahriari, and G.H. Siegel, Electron. Lett. 27, 1560 (1991).
M. Tsyonsky and O. Lev, Analyst 118, 557 (1993).
I. Kuselman, B.I. Kuyavskaya, and O. Lev, Anal. Chim. Acta 256, 65 (1992).
J. Samuel, A. Strinkovski, S. Shalom, K. Lieberman, M. Ottolenghi, D. Avnir, and A. Lewis, Mater. Lett. 21, 431 (1994).
D. Avnir, V.R. Kaufman, and R. Reisfeld, J. Non-Cryst. Solids 74, 395 (1985).
T. Murakata, S. Sato, T. Ohgawara, T. Watanabe, and T.J. Suzuki, Mater. Sci. 27, 1567 (1992).
C.J. Drummond, F. Grieser, and T.W. Healy, J. Chem. Soc., Faraday Trans. 1 85, 561 (1989) and references therein.
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Rottman, C., Turniansky, A. & Avnir, D. Sol-Gel Physical and Covalent Entrapment of Three Methyl Red Indicators: A Comparative Study. Journal of Sol-Gel Science and Technology 13, 17–25 (1998). https://doi.org/10.1023/A:1008630701220
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DOI: https://doi.org/10.1023/A:1008630701220