Harmonic dynamics of α- and β-methyl-d-galactopyranoside in the crystalline state

Harmonic Dynamics of a-D-Lactose in the Crystalline State

“…With ε=3. 0 (which gives the best results in low frequencies range) [25]. The geometry of this molecule derives from previous crystallographic works summarized in Table 1.…”

“…The bands characteristic of scissoring modes of HCH group are observed at 1457 cm -1 and 1367 cm -1 on the Raman spectrum of lactose, on the IR spectrum they are observed at 1456 cm -1 . For lactose in solution this mode is observed at 1461 cm -1 [3,25,51]. Dauchez et al [15] have calculated the scissoring mode at 1461 cm -1 and 1456 cm -1 for maltulose monohydrate, and at 1468 cm -1 and 1459 cm -1 for cellibiose, and 1470 cm -1 and 1455 cm -1 for gentibiose.…”

“…In this field, a number of theoretical works [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] have been devoted to the calculation of normal modes of vibrations of monosacharides like fucose [23], fructose [24] or methyl-galactopyranoside [25] and disaccharides like turanose and melibiose [26]. To complete the series of papers dealing with normal mode analyses of disaccharides in their crystalline environment, we have chosen to study a lactose molecule, the last is constituted by α-(D)glucopyranose linked to β-(D) galactopyranose units.…”