OSA's Digital Library

Applied Spectroscopy

Applied Spectroscopy

| PUBLISHED BY SAS — AVAILABLE FROM SAS AND OSA

  • Vol. 47, Iss. 10 — Oct. 1, 1993
  • pp: 1571–1576

Vibrational Spectra of Cyclic Polysilanes: Dodecamethylcyclohexasilane, All-trans-Hexabenzylcyclohexasilane, All-trans-Hexaphenylcyclohexasilane, and Dodecaphenylcyclohexasilane

Hongqi Li, Ian S. Butler, and John F. Harrod

Applied Spectroscopy, Vol. 47, Issue 10, pp. 1571-1576 (1993)


View Full Text Article

Acrobat PDF (541 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations
  • Export Citation/Save Click for help

Abstract

Infrared and Raman spectra have been recorded at room temperature for the following four cyclohexasilanes: dodecamethylcyclohexasilane, (SiMe<sub>2</sub>)<sub>6</sub> (I); all-<i>trans</i>-hexabenzylcyclohexasilane, [Si(H)CH<sub>2</sub>Ph]<sub>6</sub> (II); all-<i>trans</i>-hexaphenylcyclohexasilane, [Si(H)Ph]<sub>6</sub>(III); and dodecaphenylcyclohexasilane, (SiPh<sub>2</sub>)<sub>6</sub> (IV). Vibrational assignments have been proposed on the basis of the local symmetries of the silicon ring skeletons (<i>D</i><sub>3<i>d</i></sub>) and the substituent groups (Me, <i>C</i><sub>3<i>v</i></sub>; Ph and CH<sub>2</sub>Ph, <i>C</i><sub>2<i>v</i></sub>). The four polysilane oligomers can be readily distinguished from one another by their vibrational spectra. For example, characteristic ν<sub>SiH</sub> and δ<sub>SiH</sub> Raman bands of II and III were observed in the 2150–2075 and 790–600 cm<sup>−1</sup> regions, respectively, where the vibrations of III were higher in energy than were those of II. All four oligomers exhibited distinct differences in the ν<sub>SiC</sub>, ν<sub>SiSi</sub>, and δ<sub>SiC</sub> regions located below 800 cm<sup>−1</sup>. Finally, from the observed vibrational band shifts, it appears that the σ-π hyperconjugation between the Ph groups and Si atoms in the >SiR<sub>1</sub>R<sub>2</sub> fragments decreases in the order: IV (R<sub>1</sub> = R<sub>1</sub> = R<sub>2</sub> = Ph) > III (R<sub>1</sub> = H, R<sub>2</sub> = Ph) > II (R<sub>1</sub> = H, R<sub>2</sub> = CH<sub>2</sub>Ph).

Citation
Hongqi Li, Ian S. Butler, and John F. Harrod, "Vibrational Spectra of Cyclic Polysilanes: Dodecamethylcyclohexasilane, All-trans-Hexabenzylcyclohexasilane, All-trans-Hexaphenylcyclohexasilane, and Dodecaphenylcyclohexasilane," Appl. Spectrosc. 47, 1571-1576 (1993)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-47-10-1571


Sort:  Journal  |  Reset

References

References are not available for this paper.

Cited By

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited