SYNTHESIS OF A COVALENTLY BOUND POLYMERIC BORAZINE STRUCTURE ON A MESOPOROUS SILICA-GEL

The successive modification of a well-characterized porous silica gel with BCl3 and NH3 has been studied using FTIR spectroscopy with photoa coustic detection and quantitative boron chloride and ammonia analysis of the surfaces formed. A borazine-like, highly cross-linked polymeri c boron-nitrogen network, chemically bound to the silica surface, is c reated after four BCl3-NH3 reaction cycles at low reaction temperature s. Combining IR and elemental analysis results yielded a quantitative depiction of the surface structure and the reaction mechanisms.