Preparation of organic–inorganic material from MCM-48 and pyrylium salt

Pyrylium salt 2,4-diphenyl-5,6,7,8-tetrahydro-chromenylium; perchlorate (S-2) was introduced into the three-dimensional channels of mesoporous molecular sieve MCM-48 by post-synthesis impregnation method. There were large blue shifts in absorption and fluorescence spectra when S-2 was included into MCM-48. The results indicate that the S-2 molecules exist in the monomer state in MCM-48 and form hydrogen bond with the surface silanols of MCM-48.