TIME-RESOLVED RESONANCE RAMAN-SPECTROSCOPY OF TRIPLET-STATE METALATED AND FREE-BASE TETRAARYLPORPHYRINS

Steven Bell, C.B. Aakeroy, A.H.R. Alobaidi, J.N.M. Hegarty, J.J. Mcgarvey, C.R. Lefley, J.N. Moore, R.E. Hester

Research output: Contribution to journalArticle

Abstract

Resonance Raman spectra of the T-1 excited states of Zn and free-base tetra-4-sulfonatophenylporphyrin (TPPS) have been recorded at room temperature in aqueous solution using two-colour time-resolved methods. The spectra of both sulfonated molecules are very similar to their tetraphenylporphyrin (TPP) analogues, which have been recorded in THF solution using the same pump-probe conditions, but they have higher signal-to-noise ratios because interference from strong solvent bands is reduced. Although two different T-1 spectra of Zn(TPP) have been reported these spectra differ slightly from each other and from the spectrum reported here, which has band positions very close (+/-6 cm(-1)) to those of Zn(TPPS). The high S/N ratios obtainable for the water-soluble porphyrins have allowed reliable polarization data to be recorded for their S-0 and T-1 states. This data set allows a realistic comparison of the changes in bonding associated with excitation of both free-base and Zn tetraarylporphyrins to the T-1 state.
Original languageEnglish
Pages (from-to)411-418
Number of pages8
JournalJOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS
Volume91
Publication statusPublished - 1995

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    Bell, S., Aakeroy, C. B., Alobaidi, A. H. R., Hegarty, J. N. M., Mcgarvey, J. J., Lefley, C. R., Moore, J. N., & Hester, R. E. (1995). TIME-RESOLVED RESONANCE RAMAN-SPECTROSCOPY OF TRIPLET-STATE METALATED AND FREE-BASE TETRAARYLPORPHYRINS. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 91, 411-418.