Metallized pyridyl azonaphthol dyes show a well-resolved vibronic manifold in the absorption spectra of their main hue band. The vibrations and groups causing this vibronic activity were investigated by resonance Raman spectroscopy, absorption spectroscopy, and molecular orbital calculations. Resonance Raman intensity enhancements of up to 5 × 104 were observed, and all of the major group vibrations were strongly enhanced. Consequently, we have concluded that the resolvable vibronic manifold has its origin in several group vibrations.
ZimmerH.LankinD. C., and HorganS. W., Chem. Rev.71, 229 (1971).
3.
DyckR. H. and McClureD. S., J. Chem. Phys.36, 2326 (1962).
4.
Quantum Chemistry Program Exchange, Program number 71. Modified by HammondH. A., Theor. Chim. Acta18, 239 (1970), for sigma inductive effects and D. M. Sturmer for further parameter modification and sigma inductive effect modifications.
5.
AlbrechtA. C., J. Chem. Phys.33, 156 (1960).
6.
AlbrechtA. C., J. Chem. Phys.55, 4438 (1960).
7.
KoideS.UdagawaY.MikamiN.KayaK., and ItoM., Bull. Chem. Soc. Jpn.45, 3542 (1972).
8.
NishimuraY.HirakawaA. Y., and TsuboiM., in Advances in Infrared and Raman Spectroscopy, ClarkR. J. H. and HesterR. E., Eds. (Heyden, London, 1978), vol. 5, p. 217.
9.
UnoT.LeeH.SaitoV., and MachidoK., Spectrochim. Acta, Part A32, 1319 (1976).
10.
UnoT.KimB.-K.SaitoV., and MachidoK., Spectrochim. Acta, Part A32, 1179 (1976).
11.
KumarK. and CareyP. R., Can. J. Chem.55, 1444 (1977).
12.
JaffeH. H.YehS.-J., and GardnerR. W., J. Mol. Spectrosc.2, 120 (1958).
13.
LongM. E. and McKelveyJ. M., unpublished work.
14.
BottgerG. L. and RossoD. M., private communication.
