Contrasting Fe(III) Tetrakis(4-hydroxyphenyl)porphyrin Excited State Dynamics in Solution and Solid States

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• 作者：Jonathan L. Humphrey ; Darius Kuciauskas
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 7, 2008
• 年：2008
• 卷：112
• 期：5
• 页码：1700 - 1704
• 全文大小：200K
• 年卷期：v.112,no.5(February 7, 2008)
• ISSN：1932-7455

文摘

The excited-state dynamics of Fe(III) tetrakis(4-hydroxyphenyl)porphyrins were investigated on a femto- tonanosecond time scale. In acetonitrile solution, the porphyrin excited state relaxes back to the ground statein less than 30 ps. The excited-state lifetime increased to over 2.5 ns in electropolymerized films. A similareffect is observed when porphyrins are incorporated into a PMMA polymer film. The excitation is localizedon a single porphyrin chromophore in all systems, but the relaxation pathways differ in solution and solidstate. The increase of the excited-state lifetime is attributed to changes in vibrational modes, such as domingof the macrocycle, induced by the steric demands of the solid-state environment.