Terbium(III)-containing organic–inorganic hybrids synthesized through hydrochloric acid catalysis

摘要: Abstract Organic–inorganic hybrids incorporating Tb(acac) 3 ·3H 2 O (where acac is acetylacetonate) were synthesized via conventional hydrolysis sol–gel reaction in the presence and absence of an acid catalyst (hydrochloric acid, HCl). The host framework these materials, named di-ureasils, formed by polyether-based chains grafted to both ends a siliceous backbone through urea cross-linkages (–NHC(C O)NH–). Four different concentrations HCl (0.5, 1.0, 1.5, 2.0 mol L −1 ) used as for reactions. gelation time resulting materials depends on concentration varying between 5 20 min. characterized X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), 29 Si 13 C magic-angle spin nuclear magnetic resonance (NMR) photoluminescence spectroscopy. emission quantum yield undoped lies 8.7 10.6%, much higher than those obtained analogous samples prepared catalyst. For Tb 3+ -containing lanthanide local environment was affected due synthetic conditions used. An increase D 4 lifetime values, relatively that isolated complex, good agreement with smaller non-radiative transition probability suggesting replacement coordinated water molecules oxygen atom carbonyl group di-ureasil host.