Identification of a new electronic transition in the Z form of poly(dG-dC)·poly(dG-dc) by infrared absorption and resonance Raman spectroscopy |
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Authors: | L Chinsky B Jolles A Laigle P Y Turpin J Taboury E Taillandier |
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Abstract: | Infrared absorption and resonance Raman spectroscopy (RRS) are used to study poly(dG-dC)·poly(dG-dC) in two different forms: the right-handed B form at low ionic strength and the left-handed Z form at high ionic strength. The existence of a new electronic absorption band in the 290–300-nm region is evidenced by uv RRS studies of the Z form at different wavelengths of excitation. Infrared absorption spectra prove that this new electronic band is polarized perpendicularly to the cytosine plane. The possibility of a nπ* character of this transition moment is discussed. |
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