201. A resonance raman study of selected tetraphenylporphyrin dimers and their monomer constituents
- Author
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S.P. Greiner, Klaus Möbius, B. von Maltzan, C.J. Winscom, and J. Winzenburg
- Subjects
Dimer ,General Physics and Astronomy ,Resonance ,Photochemistry ,Porphyrin ,symbols.namesake ,chemistry.chemical_compound ,Crystallography ,Monomer ,chemistry ,Excited state ,Tetraphenylporphyrin ,symbols ,Physical and Theoretical Chemistry ,Spectroscopy ,Raman spectroscopy - Abstract
Two representative porphyrin dimers, each containing meso-tetraphenylporphyrin (TPP) monomers as constituents, have been studied by resonance Raman (RR) spectroscopy. In both cases the monomer units are linked through one common phenyl ring. The first incorporates a para-phenylene bridge thereby retaining a centre of inversion; the second incorporates a metaphenylene bridge and has no centre of inversion. Modes giving rise to distinguishing features (monomer versus dimer and the p -dimer versus the m -dimer) in the 300–420 cm −1 region are qualitatively assigned. It is concluded that in each dimer the componentmonomers are weakly interacting in their Soret excited states. The excitation may be considered monomer-localised on the RR time scale of ≈ 1 ps.
- Published
- 1989