Abstract
Absorption and fluorescence spectra were measured for metal free (HTSPP) and zinc (ZnTSPP) sulfonated porphyrins in SiO2 and TiO2 matrices produced by the sol-gel technique. These are compared to correspondent data obtained for the two porphyrins in ethanol at different pH values. In the silica medium (acidic), HTSPP is diprotonated and forms aggregates. This effect is found to be reversed on exposure to ammonia vapor and occurs to a much lower degree in titania matrices. This is possibly because of the smaller amount of solvent retained in the pore structure. The main effect of incorporating ZnTSPP in sol-gel-derived matrices is demetallation, although to a lesser extent than in acidic solution.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
L. Emerson and E. Rabinowitch (1960) Plant Physiol. 35, 477.
M. Gouterman (1959) J. Chem. Phys. 30, 1139.
G. Hungerford, M. Van der Auweraer, J.-C. Chambron, V. Heitz, J.-P. Sauvage, J.-L. Pierre, and D. Zurita (1999) Chem. Eur. J. 5, 2089-2100.
J. Zarzycky (1996) J. Sol-Gel Sci. Technol. 8, 1-6.
K. Dou, X. Sun, X. Wang, and E. K. Knobe (1997) SPIE Proc. 3136, 48-56. J.N. Demas and G.A Crosby (1971) J. Non Cryst. Solids 121, 254-266.
R. Reisfeld (1990) J. Non Cryst. Solids 121, 254-266.
D. Dolpphin (1978) The Porphyrins, Vol. V, Academic Press, New York, Chap.7.
M. Ravikant, D. Reddy, and T. K. Chandrashekar (1991) J. Chem. Soc. Dalton Trans. 2103-2108.
This diffractogram was kindly made available to the authors by T.M. R. Viseu.
JCPDS-International Centre for Diffraction Data (1998) Search Manual, Files 38-448 and 21-1272.
J. I. Langford (1978) J. Appl. Cryst. 11, 10-14.
I. Webman, J. Jortner, and M. H. Cohen (1977) Phys. Rev. B 15, 5712-5723.
G. Hungerford, K. Suhling, and J. A. Ferreira (1999) J. Photochem. Photobiol. A Chem. 129, 71-80.
D. L. Akins, S. O¨ zc¸elik, H-R. Zhu, and C. Guo (1996) J. Phys. Chem. 100, 14390-14396.
A. Harriman and M-C. Richoux (1984) J. Photochem. 27, 205-214
A. Stone and E. B. Fleisher (1968) J. Am. Chem. Soc. 90, 2735.
M.-C. Richoux and A. Harriman (1982) J. Chem. Soc. Faraday Trans. 1 78, 1873-1885.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hungerford, G., Ferreira, M.I.C., Pereira, M.R. et al. Spectroscopic Characterization of Porphyrin-Doped Sol-Gel-Derived Matrices. Journal of Fluorescence 10, 283 (2000). https://doi.org/10.1023/A:1009405412172
Issue Date:
DOI: https://doi.org/10.1023/A:1009405412172