The lowest field resonance around -98 ppm, not enhanced under cross-polarization, is highlighted by the green vertical line in the direct irradiation spectra (B) and is thus not a Q 3 but a Q Calcination of both variants of ZEO-4 produces the removal by combustion of the methyl groups and, through dehydration of adjacent Si-OH groups, a full connectivity of the newly introduced Si atoms yielding in both cases the same structure: the fully connected true zeolite ZEO-5 (Fig. ).