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

C–H···O Hydrogen Bonding in 4-Phenyl-Benzaldehyde: a comprehensive crystallographic, spectroscopic and computational study. Abstract The crystal structure of 4-phenyl-benzaldehyde reveals the presence of a dimer linked by the C[double bond, length as m-dash]O and C(9)–H groups of adjacent molecules. In the liquid phase, the presence of C–H⋯O bonded forms is revealed by both vibrational and NMR…

Structure-photoluminescence relationship in Eu(III) b-diketonate-based organic/inorganic hybrids. Influence of the synthesis method: carboxylic acid solvolysis versus conventional hydrolysis Abstract Organic–inorganic hybrids incorporating Eu(nta)3·bpy (where nta and bpy stand for 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate and 2,2′-bipyridine, respectively) were prepared either by acetic acid solvolysis or a conventional hydrolysis sol–gel route. The host framework of these materials, classed as di-ureasil,…

C-H···O Hydrogen Bonds in Small Ring Carbonyl Compounds: Vibrational Spectroscopy and Ab initio Calculations. Abstract The effect of the molecular structure on the properties of C-H⋅s O bonds was investigated in a set of small cyclic carbonyl compounds, using vibrational spectroscopy and ab initio calculations. Two main effects were studied: the size of the ring…