Raman spectra and thermal disordering of the crystalline structure of benzene

Сидоров, Н. В.; Krasyukov, Yu. N.; Mukhtarov, E. I.

doi:10.1007/bf02676775

Cited by 1 publication

(2 citation statements)

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“…Wavenumber shift and band broadening were observed when temperature increased as the result of fast molecular reorientations of the benzene rings. For symmetry reasons only librational modes are active in solid benzene, and thus the Raman triplet observed, for all the model compounds but more or less resolved, can be assigned to ring librational mode. At 300 K, the broad triplet envelope is located at ca.…”

Section: Resultsmentioning

confidence: 94%

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Nature of Protons, Phase Transitions, and Dynamic Disorder in Poly- and Oligoaniline Bases and Salts: An Inelastic Neutron Scattering Study

Khalki¹,

Colomban²,

Hennion

2002

Macromolecules

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An inelastic neutron scattering study of polyaniline (camphorsulfonic and chloride salts, emeraldine base in the form of powder or film) from ca. 1 to 120 cm-1 shows significant changes in the compounds as a function of the temperature. Intensity and bandwidth undergo major modifications below 50 K, because of the freezing of the dynamic ring disorder. The greatest modifications were observed for camphorsulfonic acid salt. In the range from 100 to 3000 cm-1, a nonlocalized inelastic scattering process previously assigned to the “free protons” (in other words, noncovalently bonded hydrogen atoms) was also observed. Comparison with the spectra of oxidized tetramer (BQBBa), BB (diphenylamine), BBB (N,N‘-diphenyl-1,4-phenylenediamine), and BQB (-diimine) model compounds shows that, at the neutron spectrometer resolution, the dynamics of BQB already give a good basis for the aromatic ring dynamics in a polyaniline framework. Assignment of the modes is proposed in the light of low-wavenumber Raman and IR spectra. The thermal disordering of the rotational degrees of freedom appears very similar to that observed in crystalline benzene.

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Section: Resultsmentioning

confidence: 94%

“…Translational modes of benzene are only IR-active in solid benzene. 34 We would expect the Raman activity to remain low in model compounds and to have at least one translational modes located at a very low wavenumber. IR spectra show a feature at ca.…”

Section: Resultsmentioning

confidence: 99%