Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10633200 | Optical Materials | 2005 | 11 Pages |
Abstract
The Zr(IV) and Hf(IV) phthalocyanines, with gallate as axial ligand coordinated to the central metal atom of phthalocyanine, were incorporated in silica gels during sol-gel process with using tetraethyl orthosilicate (TEOS) as precursor. The obtained mixed inorganic-organic composites were transparent and homogeneous. The absorption and emission properties of these materials in comparison with the spectra of the Zr(IV) and Hf(IV) phthalocyanines in various solvents were investigated. The spectra were correlated with various stage of the sol-gel process. It was established that in the gels concurrence of the monomer and dimer form is different in sol, alco-, hydro- and xerogels. The intensive 700-725Â nm fluorescence emission upon relatively long-wavelength excitation and unusually large (about 45Â nm) Stokes shift in the Q region, suggest that Zr(IV) and Hf(IV) phthalocyanines could be considered as photosensitizers in the PDT method (photodynamic therapy).
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Y.S. Gerasymchuk, V.Ya. Chernii, L.A. Tomachynski, J. Legendziewicz, St. Radzki,