Raman spectra of tetrabromophthalic anhydride and its associated charge-transfer complex, naphthalene-tetrabromophthalic anhydride
✍ Scribed by M. H. Kuok; E. C. Looi; S. H. Tang
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 228 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
The low-frequency Raman spectra of tetrabromophthalic anhydride (TBPA) and its associated charge-transfer complex naphthalene-tetrabromophthalic anhydride (N:TBPA) have been recorded at 300 and 77 K. Nine lattice modes are identified for TBPA, the crystal structure of which is found to be unchanged in the range 300-77 K. On complexation, N:TBPA is observed to have a lowest frequency Raman band at 19cm-'. Neither of its parent molecules have a Raman band with a lower frequency. The 19 cm-' mode is assigned to the librational motion of the donor (naphthalene) and acceptor (TBPA) molecules of the complex along their stacking axis.