Abstract
Riboflavin tetrabutyrate of yellow powder (RTB C) was prepared from a methanol-H2O (45 : 55) solvent and various spectra were compared with those of RTB A. The emission spectra around 500-600 nm explained the color of RTB C; a maximum of RTB C was about 40 nm shorter than RTB A. Powder X-ray diffraction pattern of RTB C showed an aggregate of fine crystallites. The differences in infrared spectra between RTB A and C at 3430, 1380, 880-865 and 465-445 cm-1, assigned as NH on isoalloxazine ring, suggested a weak hydrogen-bond formation of RTB C. RTB A, B (a charge transfer type) and C changed their phase each other by treating them with solvents or by heating.
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