Spectroscopic Techniques and Hindered Molecular Motion

1st Edition

Ferid Bashirov

CRC Press
July 31, 2019 Forthcoming
Reference - 161 Pages
ISBN 9780367382285 - CAT# K450150

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Spectroscopic Techniques and Hindered Molecular Motion presents a united, theoretical approach to studying classical local thermal motion of small molecules and molecular fragments in crystals by spectroscopic techniques. Mono- and polycrystalline case studies demonstrate performance validity.

The book focuses on small molecules and molecular fragments, such as N2, HCl, CO2, CH4, H2O, NH4, BeF4, NH3, CH2, CH3, C6H6, SF6, and other symmetrical atomic formations, which exhibit local hindered motion in molecular condensed media: molecular and ionic crystals, molecular liquids, liquid crystals, polymeric solids, and biological objects. It reviews the state of studying the hindered molecular motion (HMM) phenomenon and the experimental works on the basis of the latest theoretical research.

Case Studies

  • Physical models of hindered molecular motion

  • General solution of the stochastic problem for the hindered molecular motion in crystals

  • Formulae of the angular autocorrelation function symmetrized on the crystallographic point symmetry groups

  • Formulae of the spectral line shapes concerning the dielectric, infrared, Raman, nuclear magnetic relaxation, and neutron scattering spectroscopy in the presence of the hindered molecular motion

  • Experimental probation of the theoretical outcomes

  • Proton relaxation in three-atomic molecular fragments undergoing axial symmetry hindered motion

  • Structural distortion in the ordered phase of crystalline ammonium chloride

Organic compounds, polymers, pharmaceutical products, and biological systems consist of the molecular fragments, which possess rotational or conformational degrees of freedom or an atomic exchange within the fragme


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