UV resonance Raman evidence for vibrationally independent protoporphyrin IX vinyl groups
We have examined the protoporphyrin IX (PP) peripheral vinyl C=C stretching 220-nm-excited resonance Raman cross sections, depolarization ratios, and vinyl stretching frequencies. The depolarization ratio of 0.33 observed for the bis(cyanide) complexes of both PP and a monovinylporphyrin derivative indicates that the enhancement of the vinyl vibration is likely in both cases to be dominated by a single tensor component in a manner similar to that for the C=C stretch of simpler olefins. The data suggest that the two peripheral vinyl groups are vibrationally uncoupled. © 1992 American Chemical Society.
Publication Source (Journal or Book title)
Journal of Physical Chemistry
DeVito, V., Cai, M., Asher, S., Kehres, L., & Smith, K. (1992). UV resonance Raman evidence for vibrationally independent protoporphyrin IX vinyl groups. Journal of Physical Chemistry, 96 (17), 6917-6922. https://doi.org/10.1021/j100196a013