Nanoporous Networks Of Si-, Al-, P-Oxygen Tetrahedra With Encapsulated Dyes As New Composite Materials

Microporous and mesoporous molecular sieves like zeolite faujasites, AlPO(4)(-5) and Si-MCM-41 are obtained by polycondensation of oxygen containing tetrahedra of the metal aluminium, the semimetal silicon and the non-metal phosphorus by conventional or microwave-assisted hydrothermal synthesis. The encapsulation of dyes after different methods is described. Monomolecular distribution of dyes in the framework of the hosts is obtained. The encapsulated dyes show high absorption and fluorescence intensities which is interesting for photochromic switches, optical sensors and lasing. The location of a dye is identified after single molecule spectroscopy.