Add time:07/23/2019         Source:sciencedirect.com

The solid and the argon-matrix isolated samples of 6-fluorothymine, 1-methyl-6-fluorothymine, 1,3-dimethyl-6-fluorothymine and 3-methylfluorothymine are studied at low temperatures by i.r. spectroscopy. The spectra obtained are interpreted using the calculation of planar normal vibration frequencies. The electronegative fluorine atom in the 6-position is shown to have a strong influence on the normal vibration frequency changes of crystalline and isolated thymine. NH ⋯ F hydrogen bonds are evidenced to exist in crystalline samples.

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