| Abstract: | Abstract— The absorption and fluorescence spectra of acridine, phenazine, their cations and phenazine-di-N-oxide are studied in several polymer matrices. There is a one-to-one correspondence between previously measured spectra in fluid media and those reported here for plastic media. The matrix-induced spectral shifts are dependent upon the polarity and hydrogen-bonding ability of the polymer substrate. Environmental perturbations are also produced by high pressures (0–27 kbar) applied to the polymer matrix. Specific interactions between polymer substrate and the electronically excited solutes are evident from pressure-induced red shifts of the fluorescence and changes in quantum yields under pressure. These interactions between solute and its microscopic environment are subtle and varied for this group of nitrogen hetero-cyclics, although their effects are smaller than those encountered in the adsorption of related dyes. |
