D. Angelova, S. Gross, G. Kickelbick, E. Tondello, G. Trimmel, A. Venzo, L. Armelao:
"Investigation of thiourea-silanes as viable precursors for the sol-gel synthesis of composites containing Zn-S complexes";
Applied Surface Science,
Sulfur-functionalized trialkoxysilanes are suitable compds. for the sol-gel synthesis of silica glass with embedded metal sulfide nanoclusters. In this study, three different thiourea-functionalized silanes, (EtO)3Si(CH2)3NHC(:S)NHPh (SilTu), 1,4-[(EtO)3Si(CH2)3NHC(:S)NH]2Ph (diSilTu) and (MeO)3Si(CH2)3N[C(S)NH(C6H5)](CH2)2NH[C(S)NH(C6H5)] (SildiTu), were used together with Zn2+ ions to investigate their potential use in the prepn. of ZnS-SiO2 materials. Such precursors provide, in principle, a "mol.-to-nanocomposite" path by a direct anchoring of the metal cations to the forming silica network, via metal-sulfur (M-S) interactions. The sol-gel precursors were characterized by IR and NMR spectroscopies, and by electrospray mass spectrometry (ESI-MS). DiSilTu was also characterized by single crystal X-ray anal. IR and 1H, 13C and 29Si NMR measurements confirmed the formation of stable complexes with Zn2+ ions, esp. in the case of SilTu, also under sol-gel conditions.
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