A Combined Theoretical-Experimental Study of the Inclusion of Niobocene Dichloride in Native and Permethylated ß-Cyclodextrins Abstract Inclusion complexes comprising niobocene dichloride, Cp2NbCl2, and either native β-cyclodextrin (β-CD) or permethylated β-CD (TRIMEB) were prepared with a host:guest molar ratio of 1:1. The adducts were characterized in the solid state by powder X-ray diffraction (XRD), thermogravimetric analysis…
Synthesis and catalytic properties in olefin epoxidation of dioxomolybdenum(VI) complexes bearing a bidentate or tetradentate salen-type ligand Abstract The monomeric cis-dioxomolybdenum(VI) complexes [MoO2(oep-saldpen)] and [MoO2Cl2(oep-H2saldpen)], with a tetradentate [N2(imine)O2] and bidentate [N2(imine)] salen-type ligand functionalised with two pyrrole derivative pendant arms [oep-H2saldpen = 1,2-diphenylethylenebis(3-oxyethylpyrrole)salicylideneimine], were synthesised and characterised by 1H NMR, IR and Raman spectroscopy….
Probing Pseudo-Polymorphic Transitions in Pharmaceutical Solids using Raman Spectroscopy: Hydration and Dehydration of Theophylline. Abstract Theophylline is known to undergo vapor phase induced hydrate–anhydrate pseudopolymorphic transformations, which can affect its bioavailability. In this work, the kinetics of the pseudopolymorphic transitions of theophylline crystals in different storage conditions is studied using a vibrational spectroscopic technique. While…
New chloro and triphenylsiloxy derivatives of dioxomolybdenum(VI) chelated with pyrazolylpyridine ligands: Catalytic applications in olefin epoxidation Abstract Dioxomolybdenum(VI) complexes of general formula [MoO2X2L2] (X=Cl, OSiPh3; L-2 =2-(1-butyl-3-pyrazolyl)pyridine, ethyl [3-(2-pyridyl)-1-pyrazolyl]acetate) were prepared and characterised by H-1 NMR, IR and Raman spectroscopy. The assignment of the vibrational spectra was supported by ab initio calculations. A single crystal…
Vibrational study on the local structure of post-synthetic and hybrid mesoporous materials: are there fundamental distinctions? Abstract Organic-inorganic mesoporous materials of the MCM-41 type are important materials that can be prepared by either post-synthesis or one-pot synthesis procedures. A complete control of the characteristics at a local level is of the utmost importance in view…
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