Photophysical and photochemical properties of Coumarin-6 molecules incorporated within MCM-48

Laser dye Coumarin-6 (C6) molecules were incorporated into the three-dimensional channels of mesoporous molecular sieve MCM-48. The photophysical and photochemical properties of C6 in MCM-48 were characterized by absorption, emission and electron paramagnetic resonance (EPR) spectra. The results indicated that MCM-48 exerted a significant influence on the photophysical and photochemical properties of the incorporated C6 molecules. Absorption maxima of C6 in MCM-48 exhibited large red-shift while emission exhibited relatively small red-shift compared with those in ethanol. A broad EPR signal with a g value of 2.003 indicates that electron transfer occur easily in the C6/MCM-48 composite.