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….

Study of the inclusion compound formed between a luminescent europium(III) beta-diketonate complex and gamma-cyclodextrin. Abstract A 1 : 1 inclusion compound between γ-CD and the tris chelate complex Eu(NTA)3·2H2O [NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetone)] was prepared and characterized in the solid-state by powder X-ray diffraction, thermogravimetric analysis, FTIR, 13C CP MAS NMR and photoluminescence spectroscopy. Possible host-guest…