Investigation of the relationship between dipolar properties and cis-trans configuration in retinal polyenes: a comparative study using stark spectroscopy and semiempirical calculations

Article Abstract:

Electroabsorption spectroscopy in combination with semiempirical measurements were used to investigate three biologically active conformers of retinal, all-trans, 9- and 13-cis and their Schiff bases (SB). All retinal isomers were found to have a large change in ground-state dipole moments and polarizabilities. However, large deviations in the calculated and measured dipole moment values were observed for the SB forms.

Rhodopsin, Dipole moments, Polyenes, Polarization (Light)

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Stark spectroscopic studies of blue copper proteins: Azurin

Article Abstract:

Electroabsorption (Stark) spectroscopy is generally applied to the study of intramolecular electron transfer in several organic, inorganic and biological systems. The results of Electroabsorption (Stark) spectroscopy on the most intense LMCT transition for azurin from Alcaligenes denitrificans (AD) and Psuedomonas aeruginosa (PA) are reported.

Analysis, Spectra, Copper compounds, Stark effect

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Matrix and temperature effects on the electronic properties of conjugated molecules: an electroabsorption study of all-trans-retinal

Article Abstract:

The average change in polarizability upon excitation (delta, alpha) is found out using Stark effect (electroabsorption ) spectroscopy to study all-trans-retinal (ATR) in a variety of polymer matrices and organic glasses.

Science & research, Elections, Spectrum analysis, Spectroscopy, Molecules

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