Solvent-free synthesis of clathrasils using metal–organic complexes as structure-directing agents

Abstract
The two metal–organic complex salts [Co(C5H4Me)2]PF6 and [Fe(C6H6)(C5H5)]PF6 are tested as structure-directing agents in the synthesis of pure silica zeotype materials and give the clathrasil structure dodecasil-1H only in the suivent free synthesis system SiO2–NH4F–metal complex.