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)NH2Ph (diSilTu) and (MeO)3Si(CH2)3NC(S)NH(C6H5)(CH2)2NHC(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 1H, 13C and 29Si NMR measurements confirmed the formation of stable complexes with Zn2+ ions, especially in the case of SilTu, also under sol–gel conditions.
The title complex, Cu(μ‐I)(ca2en)2 ca2en is N,N′‐bis(trans‐cinnamaldehyde)ethylenediimine, C20H20N2, has a dimeric structure where two copper(I) ions are doubly bridged by iodine substituents. ...The inversion center is located midway between the two Cu atoms. The ca2en acts as a bidentate ligand coordinating via two N atoms to the copper. The coordination geometry around the Cu atom is a distorted tetrahedron formed by two N atoms from a bidentate diimine ligand and two iodine substituents. The distance between the two Cu atoms is 2.635 (2) Å. The ca2en ligand adopts a Z,Z configuration.
In the crystal structure of the title compound, C(17)H(12)N(4), the angle between the naphthalene and 1H-1,2,3-triazole ring systems is 71.02 (4)° and that between the pyridine and triazole rings is ...8.30 (9)°.
Dense silica nanoparticles are prepared by hydrolysis and condensation of tetraethoxysilane in methanol (Stöber method). The thus prepared colloids are surface-functionalized by reaction with various ...functionalized alkoxysilanes.
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