1977 Volume 50 Issue 12 Pages 3194-3198
The polarized reflection spectra of the crystals of the picric acid complexes with 1-methylnicotinamide, tryptamine, DL-tryptophan and serotonin have been measured from 15000 to 40000 cm−1 and the molar extinction coefficient of these crystals has been obtained by the Kramers-Kronig transformation. Furthermore, the theoretical calculation of the electronic states of these complexes has been made and compared with the experimental results. This analysis shows that the appearance of the new band in the region of 20000 cm−1 is the origin of the reddish color of the crystals of tryptamine picrate, DL-tryptophan picrate, and serotonin picrate; the new band can be assigned to the charge-transfer band from the picrate anion to the indole nucleus.
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