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Items for "Hydrogen bonds"

Variable temperature (100—295 K) single-crystal X-ray diffraction study of the α-polymorph of glycylglycine and a glycylglycine hydrate

The crystal structures of the α-polymorph of glycylglycine (glygly) and of its hydrate (glygly × 1.5 H₂O) were refined by single-crystal X-ray diffraction at 100, 150, 220, and 295 K (glygly) and at 100, 200, 295 K (glygly × 1.5 H₂O)...

Keywords: Lattice strain, Hydrogen bonds, Thermal expansion, Dehydration, Dipeptides

02/2006 | Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

A comparative study of the anisotropy of lattice strain induced in the crystals of DL-serine by cooling down to 100 K, or by increasing pressure up to 8.6 GPa. A comparison with L-serine

The anisotropy of lattice strain in the crystals of DL-serine (P2₁/n) on cooling down to 100 K and with increasing hydrostatic pressure up to 8.6 GPa was studied by single-crystal X-ray diffraction...

Keywords: DL-serine, Hydrogen bonds, Amino acids, Low temperature, High pressure

02/2006 | Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Comparison of the Proton Transfer Path in Hydrogen Bonds from Theoretical Potential Energy Surfaces and the Concept of Conservation of Bond Order

The ‘quantum-mechanically derived reaction coordinates’ (QMRC) for the proton transfer in hydrogen bonds involving fluorine, oxygen and chlorine have been derived from earlier ab initio calculations of potential energy surfaces...

Keywords: Hydrogen bonds, Proton Transfer Path, Potential Energy Surface, Reaction Coordinates, Pauling Bond Order

07/2006 | Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Dielectric relaxation of water adsorbed on wood and charcoal

The dielectric relaxation due to motions of water molecules adsorbed on wood treated at various temperatures up to 550°C was investigated based on the relationships between activation enthalpy (?H) and entropy (?S) in relaxation...

Keywords: charcoal, Dielectric Relaxation, Hydrogen bonds, micropores, Water