Electronic excited states of polynucleotides: A study by electroabsorption spectroscopy

Article Abstract:

Electroabsorption spectra are produced for single-stranded polynucleotides poly(U), poly(C), poly(A), and poly(G) in glycerol/.water glass at low temperature, and the differences in permanent dipole moment ([Delta][mu]) and polarizability ([Delta][alpha]) are determined for various spectral ranges covering the lowest energy absorption band around 260nm. The electroabsorption data facilitates distinguishing a weak electronic transition associated with a wing in polynucleotide absorption spectra, at energy below the electronic origin in absorption spectra of monomeric nucleobases.

Analysis, Electric properties, Dipole moments, Absorption spectra, Polarization (Electricity), Structure, Chemical properties

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RNA structured forms studied by vibrational circular dichroism: an initio interpretation of the spectra

Article Abstract:

Infrared (Ir) and vibrational circular dichroism (VCD) spectra of single-stranded poly(rA) and poly(rU) RNA polynucleotides and double- and triple-stranded RNA helices were recorded and interpreted on the basis of density functional theory (DFT) at the BPW91/6-31G level. The normal mode partial optimization method was found to be convenient for relaxation of the fragment geometries.

RNA, Chemistry, Physical and theoretical, Physical chemistry

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