Structural studies of the bisimidazole 5,5-dimethyl-1,3,2-dioxaphospharinane-2-thioxo-2-hydroxy complex

Article Abstract:

The molecular structure of the bisimidazole 5,5-dimethyl-1,3,2-dioxaphosphorinane-2-thioxo-2-hydroxy complex was investigated. It was found that the molecular complex of imidazole with 5,5-dimethyl-1,3,2-dioxaphosphorinane-2-thioxo-2-hydroxy acid involves strong (O-H***H and N H(super +)***N) and weak (C-H***O and C-H***S) hydrogen bonds and exhibits a unique molecular packing. An analysis of (super 13)C chemical shift parameters provides data about the strength of the hydrogen bonds and the localization of the proton in the N***H(super +)***N linkage.

Research, Ions, Catalysis, Imidazole

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X-ray and nuclear magnetic resonance (NMR) studies of signalizing the tripeptide sequence (Tyr-D-Ala-Phe) of dermorphin and deltorphins I and II. Comparative analysis in the liquid and solid phases

Article Abstract:

The crystal and molecular structure of compound, the 'message' Tyr-D-Ala-Phe sequence of dermorphin and deltorphins I, II opioid peptides, was established using X-ray diffraction methods at a temperature of 100 K. NMR spectroscopy measurements were performed in the liquid and solid states, to conclude a higher-order structure in both phases and correlate with X-ray data.

Analysis, Usage, Peptides, Nuclear magnetic resonance spectroscopy, Structure

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