Quantitative orientation of alpha helical polypeptides by attenuated total reflection infrared spectroscopy

Article Abstract:

Polarized ATR spectroscopy is a powerful method for studying the molecular orientation of thin films and in particular of alpha helical polypeptides. It consists of the determination of the anisotropic optical constants of the studied system, the simulatiom of the polarized ATR spectra for various orientations of the molecular axes, and the comparison of the simulated and experimental spectra.

Optical properties, Polarization (Light)

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Secondary structure analysis of polypeptides based on an excitonic coupling model to describe the band profile of amide I' of IR, Raman, and vibrational circular dichroism spectra

Article Abstract:

A novel approach, which allows a precise structure analysis of short and intermediate sized peptides, is developed. The vibrational eigenfunctions obtained by diagonalizing the complete Hamiltonian of the interacting amide I' modes are used to calculate the amide I' band profile in the IR, isotropic, and anisotropic Raman and vibrational circular dichroism spectrum.

Molecular structure

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Quantitative determination of the polar order induced under high electric field in amorphous PDR1M azobenzene polymer films

Article Abstract:

Experimental evidence for a strong polar ordering induced by wire poling under high electric field conditions in the amorphous pDR1M azobenzene polymer is reported. A comparative study of the electronic spectra of a DR1 solution in chloroform and of an unpoled, a poled and a thermally depoled film is discussed.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Petrochemical Manufacturing, Benzene, Chloroform, Electric properties, Chemistry, Physical and theoretical, Physical chemistry

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