Articles

Inclusion complex formation of diferrocenyldimethylsilane with b-cyclodextrin. Abstract An inclusion compound comprising β-cyclodextrin (β-CD) and diferrocenyldimethylsilane, Fc–SiMe2–Fc [Fc = (η5-C5H5)Fe(η5-C5H4)], has been prepared and characterized in the solid state by powder X-ray diffraction (XRD), thermogravimetric analysis (TGA) and magic angle spinning (MAS) NMR spectroscopy (13C, 29Si). Elemental analysis indicated that the host:guest molar ratio in…

Inclusion complexation of dimeric and trimeric oligo(ferrocenyldimethylsilanes) with gamma-cyclodextrin. Abstract The oligo(ferrocenyldimethylsilanes) FcSiMe2Fc and FcSiMe2[(η5-C5H4)Fe(η5-C5H4SiMe2)]Fc [Fc = (η5-C5H5)Fe(η5-C5H4)] were encapsulated in γ-cyclodextrin (CD) to give crystalline inclusion compounds with 2:1 and 3:1 (host-to-guest) stoichiometries, respectively. A complex between γ-CD and ferrocene was also prepared for comparison. The formation of true inclusion complexes was confirmed in…

Emission quantum yield of a europium(III) tris-b-diketonate complex bearing a 1,4-diaza-1,3-butadiene: Comparison with Theoretical Prediction. Abstract The Eu(NTA)3 · p-tolyl-DAB complex (DAB = 1,4-diaza-1,3-butadienes of the type RNdouble bondCHCHdouble bondNR, R = p-tolyl) is the clearest example reported in the literature until now that provides the experimental validation of the theoretical predictions recently developed for…

Highly Luminescent Tris(b-diketonate)europium(III) Complexes Immobilized in a Functionalized Mesoporous Silica. Abstract The mesoporous silica MCM-41 functionalized with a chelating pyrazolylpyridine ligand (MCM-41-L2) was used as a support for the immobilization of tris(β-diketonate) complexes Ln(NTA)3 [Ln = Eu, Gd; NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetonate]. The derivatized materials were characterized by powder X-ray diffraction, N2 adsorption, FTIR and FT…

Comment on vibrational spectral investigation on xanthine and its derivatives – theophylline, caffeine and theobromine. A. M. Amado, Paulo Ribeiro-Claro. Full Article