| abstract |
The invention relates to a crystalline solid, designated IM-18, which has an X-ray diffraction pattern as given below. Said solid has a chemical composition expressed according to the empirical formula mXO2: nGeO2: pZ2O3: qR: sF: wH2O, where R represents one or more organic species, X represents one or more tetravalent element (s) ) different from the germanium, Z represents at least one trivalent element and F is fluorine. |