Infra-red and Raman spectra of five-membered heterocyclic molecules—oxazole and thiazole

Mechanical Properties versus Morphology of Ordered Polymers. Volume III. Part I

“…Using the approximation e-X = l-x, equation (7) becomes So(q) = e-Rg 2 q 2 /3 (16) and thus a plot of log So(q) versus q 2 yields the radius of gyration and hence the rod length.…”

“…In this case, the Raman spectra were obtained using less Since the isotropic to nematic phase transformation occurs near 5% concentration, the spectral changes cannot be associated with the change in the intermolecular interaction, but rather with the structure of the polymer. On the basis of the vibrational spectra obtained for biphenyl and heterocyclic model compounds [26][27][28][29][30], the Raman bands observed were assignable to the stretching vibrations of the heterocyclic group, the phenyl ring and the C-C bond linking them [12].…”

“…Tentative assignments based on model compounds and the measured transition moments are listed in Table 1 [12,13,[14][15][16][17][18].…”

Synthesis of New Furobenzoxazole and Furoflavone Derivatives

“…The band at 1375 cm -1 is caused by the symmetrical deformation mode of the C-CH3 group [8]. The absorption at 1330 cm -1 can be attributed to the vibrations of the oxazole heterocycles [3,6,7].…”

“…The bands in the 1625-1510 cm -1 region are associated with the C=C (aromatic) and C=N (oxazole) vibrations [6,7]. The band at 1375 cm -1 is caused by the symmetrical deformation mode of the C-CH3 group [8].…”