The photophysical properties of Mg and Zn tetrabenzoporphyrins and Cd-texaphyrin are presented. These sensitizers have strong absorption bands in the red and near-IR regions that make them good candidates for biological photosensitization. Singlet oxygen quantum yields which were determined in an absolute manner, in several solvents, are reported. We show an unusual behavior regarding adherence to Kasha's and Vavilov's rules: upon excitation to different electronic states, different values of singlet oxygen quantum yields were obtained. We also show an unusual wavelength dependence of singlet oxygen and fluorescence yields upon excitation to different vibrational levels within the same electronic state.
|Number of pages||7|
|Journal||Chemical Physics Letters|
|State||Published - 23 Dec 1994|
Bibliographical noteFunding Information:
This work was supportedb y a grant from the Israel ScienceF oundation administeredb y the Israel Academy of Sciences and Humanities. We thank Dr. Jonathan L. Sesslera nd Greg Hemmi from the University of Texas, Austin for the gift of CdTX.