Photofunctional metalloporphyrins functionalized mesoporous hybrids phen-Ln(LSi)-SBA-15 (Ln = Nd, Yb, L = porphyrin derivatives)

SBA-15 mesoporous silica has been functionalized with two kinds of macrocylic porphyrin derivatives (meso-(tetra(p-hydroxyphenyl)porphyrin (THPP), protoporphyrin IX (PPIX) through condensation approach of tetraethoxysilane (TEOS) in the presence of Pluronic P123 surfactant as a template. THPP and PPIX grafted to the coupling agents 3-(triethoxysilyl)-propyl isocyanate (TEPIC) and 3-aminopropyl)triethoxysilane (APTES), respectively are used as the precursor for the preparation of mesoporous materials. Novel organic–inorganic mesoporous luminescent hybrid containing Ln3+ (Nd3+, Yb3+) complexes covalently attached to the functionalized ordered mesoporous SBA-15 and 1,10-phenanthroline (phen) as second ligand, which are designated as phen-Ln-THPP-SBA-15 and phen-Ln-PPIX-SBA-15, respectively, are obtained by sol–gel process. The resulting mesoporous hybrids are characterized by FT-IR spectra, Small-angle X-ray diffraction, N2 adsorption–desorption measurement, thermal analysis and spectroscopy. It is found that they all have high surface area, uniform in the mesostructure and good crystallinity. Measurement of the photoluminescence properties show the Ln3+ covalently bonded mesoporous material exhibit the characteristic NIR luminescence of Nd3+ and Yb3+.

Novel organic–inorganic mesoporous luminescent hybrid containing Ln3+ (Nd3+, Yb3+) complexes covalently attached to the porphyrin derivative functionalized ordered mesoporous SBA-15 and 1,10-phenanthroline (phen) as second ligand, which are designated as phen-Ln-THPP-SBA-15 and phen-Ln-PPIX-SBA-15, respectively, which exhibit the characteristic NIR luminescence of Nd3+ and Yb3+.Figure optionsDownload as PowerPoint slideHighlights
► Novel linkages of functionalized porphyrin derivatives.
► New lanthanide mesoporous hybrids.
► Luminescence in NIR region.