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The preparation and characterization of silica gels doped with copper complexes |
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| Authors: | J. Yan A. M. Buckley M. Greenblatt |
| Affiliation: | Department of Chemistry, Rutgers - The State University of New Jersey, Piscataway, NJ 08855-0939, USA |
| Abstract: | Silica gels doped with [Cu(C5H5N)4]2+ (C5H5N = Py), CuCl2-HOCH2CH2OH and Cu(CH3COO)2-NH2(CH2)3Si-(OC2H5)3 (CH3COO = OAc, C2H5 = Et) have been prepared and examined by X-ray diffraction, electron spin resonance, transmission electron microscopy (TEM), thermal gravimetric analysis and Fourier transform infrared spectroscopy. Different dopants have different interactions with the silica alcogels depending on the chemistry of the dopants: [Cu(Py)4]2+ forms chemical bonds with the hydroxyl oxygens on the surface of the silica matrix; in Cu(OAc)2-NH2(CH2)3Si(OEt)3-doped alcogels, the siloamine enters into the sol-gel reaction and Cu(OAc)2 coordinates to the -NH2(CH2)3 ligand of the precursor. However, there is no evidence for bond formation between copper and the hydroxyl groups on the silica surface in the CuCl2-HOCH2CH2OH-doped alcogels. The TEM images show a homogeneous and uniform distribution of copper particles on the reduced CuCl2-HOCH2CH2OH- and Cu(OAc)2-NH2(CH2)3Si(OEt)3-doped xerogel surface. The type of nitrogen adsorption isotherms of doped silica xerogels are unaffected by the dopant concentration. However, their surface areas do depend on the level of dopant. The microstructure of the silica matrix is primarily determined by the pH of the initial reactants, at least in the [Cu(Py)4]2+-doped case. |
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