Novel excited quintet state in porphyrin: Bis(quinoline-TEMPO)-yttrium- tetraphenylporphine complex

Luca Maretti, Saiful S.M. Islam, Yasunori Ohba, Takashi Kajiwara, Seigo Yamauchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


New mono- and bis[4-(3-hydroxy-2-methyl-4-quinolinoyloxy)-2,2,6,6- tetramethylpiperidin-1-oxyl](meso-tetraphenylporphyrinato)yttrium-(III) complexes have been synthesized, and the properties of the excited states generated by photoexcitation of porphyrin were studied by time-resolved (TR) and pulsed two-dimensional electron paramagnetic resonance (EPR) spectroscopy. A TR-EPR spectrum was observed in the quartet (S = 3/2) or quintet (S = 2) states generated from interactions of one or two radicals with the photoexcited triplet state of the porphyrin. The zero-field splitting D values of these states were analyzed in terms of those of the triplet and the radical-triplet pair. The spin states of the excited states were definitely assigned by measuring the nutation frequencies with pulsed EPR.

Original languageEnglish
Pages (from-to)9125-9127
Number of pages3
JournalInorganic chemistry
Issue number25
Publication statusPublished - 2005 Dec 12

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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