the si sp-map spectra of zso-4.0 and zso-7.7 samples show the large signals typical of amorphous structures and very similar to the spectrum recorded on sio2 fig3 the signals attributed to q1 and q3 resonances present 2-ppm up field shift in comparision with the corresponding resonance in sio2 with out valuable changes in line-width the spectrum of zso-50.2 with the highest loading of crytalline zon secxrd shows q4 and q3 signals and a broad shoulder in the rang-70 to 100 ppm dueto overlapping of at least four components suggesting both the presence of pure sio2 domains and theformation of si-o-zn bonds in different substituted si unite