Vibrational dynamics of crystalline L-alanine

Vibrational analysis of crystalline tri-L-alanine.

We have found that tri-L-alanine (Ala3) can crystallize in a parallel-chain beta structure in addition to the previously known antiparallel-chain beta structure. Although the chain conformations in each structure are essentially similar, the ir and Raman spectra are distinctively different. We have calculated the normal modes of each structure, and can account in significant detail for these di...

Vibrational Analysis of Crystalline Triglycine*

We have refined vibrational force fields for polypeptides that permit excellent reproduction of the normal mode frequencies of such molecules. This is demonstrated in the present study, in which 80 IR and Raman bands of crystalline triglycine between 1800 and 200 cm-’ are reproduced with an average error of 6 cm-‘. A deuterated sample is shown by normal mode analysis to have remained protonated...

Steroid hormone activation of L-alanine oxidation catalyzed by a subunit of crystalline glutamic dehydrogenase.

Vibrational States of Glassy and Crystalline Orthoterphenyl

Low-frequency vibrations of glassy and crystalline orthoterphenyl are studied by means of neutron scattering. Phonon dispersions are measured along the main axes of a single crystal, and the corresponding longitudinal and transversal sound velocities are obtained. For glassy and polycrystalline samples, a density of vibrational states is determined and cross-checked against other dynamic observ...

Vibrational and Thermal Properties of Crystalline Topiramate

Universidade Regional do Cariri, 63105-000 Crato-CE, Brazil Departamento de Física, Universidade Federal do Ceará, 60455-760 Fortaleza-CE, Brazil Faculdade de Ciências, Universidade Estadual Paulista, Bauru-SP, Brazil Instituto de Química, Universidade Estadual Paulista, PO Box 355, 14801-970 Araraquara-SP, Brazil Laboratório de Química do Estado Sólido, Instituto de Química, Universidade Estad...