Optical Properties Of Rx0Y-Si02 Gel (R=B, Al Or Ti) Doped With 1,4-Dihydorxyanthraquinone

1,4-dihydroxyanthraquinone (DAQ) doped binary systems (BO312-SiO2, Al0312-Si02 and Si02 systems) were prepared by the sol-gel process. The absorption spectra for these three systems shifted to longer wavelengths in comparision to DAQ doped Si02 gel. The red shifts can be interpreted by the electron donating abilities of metal atoms which replaced the hydrogen bonded proton in the DAQ molecule. The electron donating abilities of metal atoms can be estimated as the microscopic optical basicities for the metal oxygen units. The infrared spectra clearly demonstrated that the hydrogen bonded protons of DAQ was replaced by the B, Al or Ti atoms. Persistent spectral holes were burnt at the lowest absorption peak in all systems.