Add time:09/30/2019 Source:sciencedirect.com
Polarized Raman scattering measurements from the bulk of monoclinic molecular crystal of 9-methyladenine:1-methylthymine complex were carried out without modification of its natural crystal faces. Analysis of the results obtained for three different crystal orientations enabled to eliminate various artifacts in the spectra and to determine squared components of the Raman tensors for fundamental vibrational transitions in the region of 180–3500 cm−1. Comparison of the results with those obtained on 9-methyladenine single crystal and 1-methylthymine single crystal was made to identify the influence of the Hoogsteen hydrogen pairing in the complex on the vibrational modes. Besides spectral shifts of several bands, couplings of the methyladenine vibrational mode with the methylthymine mode of close frequency were also found.
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