Composite Materials on the Base of Nanoporous SiO2 Matrices with Polymethine Dyes Molecules

Sol-gel SiO2 matrices with Polymethine dyes (РМ1, РМ2 and РМ3) were synthesized using citric acid as a catalyst. There were measured the absorption and luminescence spectra of РМ1, РМ2 and РМ3 dyes (with a concentration of 1·10–5 mole/dm3) in different solvents (ethanol, dimethylformamide, formamide and water) and in sol-gel SiO2 matrices. The said dyes were found to be present in monomeric form in eth-anol, dimethylformamide and formamide. PM1 dye did not form dimers in water and in matrices and re-tained its color. PM2 and PM3 dyes aggregated into the network of SiO2 matrices and in water solution, and the intensity of their coloration reduced in the course of time