Unravelling the disordered hydrogen bonding arrangement in solid triphenylmethanol

Article Abstract:

Research was conducted to examine the structural characterization of the hydrogen-bonding arrangement in triphenylmethanol via single-crystal neutron diffraction, single-crystal X-ray diffraction and high-resolution solid-state 13C NMR spectroscopy. An accurate determination of the positions of the hydrogen atoms in the hydrogen-bonding arrangement was obtained by the single-crystal neutron diffraction experiments while the single-crystal X-ray diffraction experiments have extended previous studies across a wider temperature range. The high-resolution solid-state 13C NMR experiments have provided insights into local structural aspects of the hydrogen-bonded tetramers.

Molecular structure, Hydrogen bonding, Hydrogen bonds

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Significantly contrasting solid state dynamics of the racemic and enantiomerically pure crystalline forms of an amino acid

Article Abstract:

Solid state dynamic properties is investigated for the racemic (DL) and enantiomerically pure (L) crystalline forms of the amino acid serine [HO.CH2.CH(NH(sub 3)( super +).CO(sub 2)(super -)] using (super 2)H NMR line shape analysis and (super 2)H NMR pin-lattice relaxation time measurements for samples of DL-serine and L-serine deuterated in the NH(sub 3)(super +) and OH groups. The difference in activation energies between DL-serine and L-serine is greater than any other reported amino acid in different crystal forms.

Analysis, Nuclear magnetic resonance, Amino acids, Properties, Structure, Chemical properties

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Dynamic properties of the tetrahydrofuran clathrate hydrate, investigated by solid state (super)2H NMR spectroscopy

Article Abstract:

Solid-state (super 2)H nuclear magnetic resonance (NMR) techniques, including line shape analysis and spin-lattice relaxation time (T(super 1)) measurements were employed for examining the dynamic properties of the clathrate hydrate containing tetrahydrofuran (THF) guest molecules. The results suggest the existence of at least two dynamically distinguishable types of water molecule in THF-D2, where both undergo four-site tetrahedral jump motions but with different rates.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Tetrahydrofuran, Usage, Nuclear magnetic resonance spectroscopy, Optical properties, Chemistry, Physical and theoretical, Physical chemistry, Clathrate compounds, NMR spectroscopy

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