Sulphur-functionalised trialkoxysilanes are suitable compounds for the sol–gel synthesis of silica glass embedding metal sulphide nanoclusters. In this study, three different thiourea-functionalised 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 preparation of ZnS–SiO2 materials. Such precursors provide, in principle, a “molecule-to-nanocomposite” path by a direct anchoring of the metal cations to the forming silica network, via metal–sulphur (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 analysis. IR and
Investigation of thiourea-silanes as viable precursors for the sol–gel synthesis of composites containing Zn–S complexes
Armelao L;GROSS, SILVIA
;
2004
Abstract
Sulphur-functionalised trialkoxysilanes are suitable compounds for the sol–gel synthesis of silica glass embedding metal sulphide nanoclusters. In this study, three different thiourea-functionalised 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 preparation of ZnS–SiO2 materials. Such precursors provide, in principle, a “molecule-to-nanocomposite” path by a direct anchoring of the metal cations to the forming silica network, via metal–sulphur (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 analysis. IR andPubblicazioni consigliate
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