Infrared and Raman Studies of Ortho- and Meta-Substituted Styrenes

Abstract

Infrared and Raman spectra have been obtained over the region 4000 cm−1 to 33 cm−1 on ortho-and meta-substituted styrenes including F, Br, Cl, methyl, and meta-nitro derivatives. The entire spectral region has been investigated in the liquid state while selected regions and isomers have been studied in the solid and gas phase. Gas phase and interferometric spectra in the far ir of ortho-and meta-fluorostyrene did not reveal the torsional modes. Assignment of most fundamental modes of vibrations are reported and discussed.

Anionic Copolymerization of Styrene Sulfide with Elemental Sulfur (S8)

“…It indicates the effective conversion of the epoxide to the thiirane. Comparing the regions at 905-915, 985-995 and near 1630 cm −1 , where bands characteristic for the vibrations of vinyl groups appear, we can unambiguously claim that in the synthesized styrene sulfide, styrene does not occur [33]. The FTIR spectra confirm the successful synthesis of the monomer (StS), used in the further reactions.…”

“…1600 cm −1 (ring skeletal stretch). Moreover, the bands assigned to the C−H bond, at 775 cm −1 (C-H out of plane deformation) and at 1030 cm −1 (C-H in plane deformation) are also overlapping [33].…”

“…Moreover, the successful conversion of styrene oxide into styrene sulfide is confirmed by a lack of the characteristic epoxy ring breathing band in the StS spectrum, which is visible well in the StO spectrum at 1252 cm −1 [31]. Additionally, in Figure 2b, the characteristic absorption bands in the spectrum of styrene at 1630 cm −1 assigned to the vinyl ν (C=C) and at 1414 cm −1 corresponding to the vinyl=CH 2 group [32,33] are not present in the spectrum of styrene sulfide. Comparing the high Raman region (Figure 2c), one can see that the band related to vinyl stretch at 3010 cm −1 is also not present in the spectrum of styrene sulfide.…”

Selective Attachment of 4-Bromostyrene on the Si(111)-(7 × 7) Surface

“…30,31 Among them, the peak at 3057 cm À1 is assigned to the sp 2 aromatic ring CH stretching mode; the loss feature at 1600 cm À1 is attributed to the stretching mode of the vinyl CdC group; the peaks at 1560, 1429, 1009, and 420 cm À1 are associated with the characteristic vibrational modes of the phenyl ring; the peak at 611 cm À1 is related to the CH stretching and bending modes in the Br-sensitive CH:CHBr group. 30, 31 The vibrational features of chemisorbed 4-bromostyrene were obtained by annealing the physisorbed multilayer sample to 300 K to drive away all the physisorbed molecules and only retain the chemisorbed molecules, shown in Figure 6. There are several distinct differences between the spectra for the physisorbed and chemisorbed molecules.…”

An approach to the structure and vibrational analysis of cis- and trans-3-chlorostyrene through IR/Raman and INS spectroscopies and theoretical ab initio/DFT calculations

“…There are some preliminary vibrational spectroscopic studies by Fateley et al (IR/Raman), 12 Singh et al (Raman) 13 and Tripathi (IR) 14 and a more extensive and recent study by Ribeiro-Claro et al. 15 All these studies state the existence of a cis-trans equilibrium and the last study concluding that the cis conformer is likely to be the more stable in the liquid state, a conclusion reached by analysing the Raman intensities.…”