Interactions of omeprazole and precursors with b-cyclodextrin host molecules. Abstract β-Cyclodextrin (β-CD) was mixed with omeprazoleand some of its precursors in aqueous or water/ethanol solutions, and theresulting crystalline products have been characterized by elemental analysis,thermogravimetry, powder X-ray diffraction (XRD), FTIR and 13C CP MAS NMRspectroscopy. In the case of2-chloromethyl-4-methoxy-3,5-dimethylpyridine…HCl, itwas found that the solid product…

Strong Experimental Evidence of C-H···O Hydrogen Bonds in Cyclopentanone: The Splitting of the C=O mode revisited. Abstract The assignment of the splitting of the ν(CO) mode in cyclopentanone is reassessed through an extensive vibrational study, including temperature and solvent variation studies, isotopic substitution, and ab initio calculations of monomer and dimer structures and spectra. The…

Use of FTIR, FT-Raman and 13C-NMR Spectrsocopies for Identification of some Seaweed Phycocolloids. Abstract Many seaweeds produce phycocolloids, stored in the cell wall. Members of the Rhodophyceae produce polysaccharides the main components of which are galactose (galactans)—agar and carrageenan. In addition, alginic acid is extracted from members of the Phaeophyceae. This is a binary polyuronide…

Surface adsorption of 4,4′-dithiopyridine and 2,2′-dithiopyridine on silver nanoparticles. Abstract A detailed vibrational study on the isomers 2,2′-dithiodipyridine and 4,4′-dithiodipyridine was carried out. These organic ligands are of great interest as possible linkers in the fabrication of nanostructures, and therefore a study on the adsorption modes of both ligands at silver surfaces is presented. Orientational…

Encapsulation of sodium nimesulide and percursors in beta-cyclodextrin. Abstract Crystalline 1:1 inclusion complexes with beta-cyclodextrin (beta-CD) and the sodium salt of nimesulide (4-nitro-2-phenoxymethanesulfonanilide), and the sodium salt of the derivative 2-phenoxymethanesulfonanilide, have been prepared by co-precipitation from aqueous solution. The presence of true inclusion complexes was supported by elemental analysis, thermogravimetry and powder X-ray diffraction….