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Raman spectroscopic study of bis(4-biphenylyl)acetylene in the S0, S1 and T1 states

✍ Scribed by Toshio Kamisuki; Munetaka Akita; Yoshihiko Moro-oka; Chiaki Hirose

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
347 KB
Volume
28
Category
Article
ISSN
0377-0486

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✦ Synopsis

The coherent Raman (CARS and CSRS) spectra for the excited and states of bis(4-biphenylyl)acetylene (S 1 T 1 ) (BBA) and also the spontaneous Raman spectrum for the ground state were observed. The assignments of (S 0 ) vibrational bands were made tentatively by comparison with reported results for related compounds such as diphenylacetylene, biphenyl and trans-4,4ΒΊ-diphenylstilbene in various electronic states. Characteristic features of the Raman shifts and intensities of the spectra in the and states are discussed in relation to the di †erences in S 1 T 1 electronic structures. The decrease of the CyC stretching wavenumber in going from the to the state is S 0 T 1 ascribed to the localization of the triplet state inside the acetylene part as was described previously for the case of diphenylacetylene. A p-electronic conjugation over the biphenyl parts giving a more planar structure is deduced as being signiÐcant in the state.

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