State Mixings in the Excited Triplet and Singlet States of Fluorine-Substituted Magnesium Tetraphenylporphines Studied by Optical and Time-Resolved EPR Spectroscopy

Seigo Yamauchi, Yasuhisa Matsukawa, Yasunori Oba, Masamoto Iwaizumi

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Optical and time-resolved EPR(TREPR) studies were made on the excited states of fluorine-substituted magnesium tetraphenylporphines (MgF-TPPs) including related Mg porphyrins. From the analyses of TREPR spectra it was found that the zero-field splitting parameter, D, increased with an increasing number of substituents, e.g. fluorine atoms. This result is interpreted by the fact that 3(a2ueg) and 3(a1ueg) configurations are heavily mixed via vibronic couplings in the lowest excited triplet (T1) states of MgF-TPPs. Other T1 properties such as a T1 energy, a triplet lifetime, and an appearance of the b1g band in the phosphorescence supported the mixings. The mixings due to configuration interactions were studied in the lowest excited singlet (S1) states of MgF-TPPs by measuring absorption coefficients and intensities of vibronic bands both in the absorption and fluorescence. The magnitudes of the mixings were also evaluated in the S1 states of MgF-TPPs.

本文言語English
ページ(範囲)2910-2914
ページ数5
ジャーナルInorganic chemistry
35
10
出版ステータスPublished - 1996 12 1

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 無機化学

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