Resonance Raman spectroscopy of excited-state iron(III) tetraphenylporphyrin

✍ Scribed by J.C. Austin; S.E.J. Bell; R.E. Hester

• Book ID: 103024734
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 398 KB
• Volume: 169
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)85214-w

✦ Synopsis

Two-colour time-resolved resonance Raman spectroscopy has been used to probe the longest-lived excited state of iron(III) tetraphenylporphyrin (Fe(TPP)Cl). Single-laser (408 nm) irradiation of Fe(TPP)CI showed that significant depopulation of the ground electronic stale could be achieved by use of high power, 10 ns duration, pulses. Two-colour time-resolved spectra showed the formation of an excited species whose lifetime was shorter than the laser pulse widths used. The resonance Raman spectra of this species, identified as the lowest-lying "triplet" state, showed frequency shifts associated with porphyrin core expansion. The origins ofthe differences between the resonance Raman spectra of"triplct" Fe(TPP)CI and triplet Zn(TPP) are discussed.