Dioxomolybdenum(VI) modified mesoporous materials for the catalytic epoxidation of olefins Abstract Organic–inorganic hybrid heterogeneous catalyst systems were synthesized by the reaction of the dioxomolybdenum(VI) complex MoO2Cl2(THF)2 with the mesoporous silica MCM-41 functionalized with a pyrazolylpyridine ligand (MCM-41-PP). Two catalysts were prepared, one of which involved the postsynthesis trimethylsilylation of MCM-41-PP to remove the residual surface…

b-Cyclodextrin inclusion of europium(III) tris(b-diketonate)-bipyridine. Abstract The adduct Eu(NTA)3 · bipy was prepared by the reaction of Eu(NTA)3 · 2H2O with 2,2′-bipyridine in a 1:1 ratio in chloroform [NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetonate]. Recrystallization of the complex from a chloroform/diethyl ether solvent mixture gave crystals suitable for X-ray diffraction. The structure contained chloroform molecules in partially occupied…

Catalytic Properties of the Dioxomolybdenum Siloxide MoO2(OSiPh3)2 and its 2,2′-Bipyridine Adduct MoO2(OSiPh3)2(bpy). Abstract The tetrahedral triphenylsiloxy complex MoO2(OSiPh3)2 (1) and its Lewis base adduct with 2,2′-bipyridine, MoO2(OSiPh3)2(bpy) (2), were prepared and characterised by IR/Raman spectroscopy, and thermogravimetric analysis. Both compounds catalyse the epoxidation of cis-cyclooctene at 55 ºC using tert-butylhydroperoxide (t-BuOOH) is decane as the…

Modification of the luminescence properties of a europium(III tris(-diketonate) complex by inclusion in -cyclodextrin and 2,3,6-trimethyl–cyclodextrin s. Abstract A 1:1 inclusion compound between octakis(2,3,6-tri-O-methyl)-gamma-cyclodextrin (TRIMEG) and the chelate complex Eu(NTA)(3)center dot 2H(2)O (NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetonate) was prepared and characterized by powder X-ray diffraction, thermogravimetric analysis and photoluminescence spectroscopy. The results were compared with those obtained…

Immobilisation of methyltrioxorhenium on functionalised MCM-41. Abstract Methyltrioxorhenium (MTO) was immobilised in the mesoporous silica MCM-41 functionalised with a pyrazolylpyridine ligand. Elemental analysis indicated that the rhenium loading in the final material (3.6 wt.%, 0.19 mmol g−1) was about 35% of the ligand content. Powder X-ray diffraction confirmed that the regular hexagonal symmetry of the…