External Electric Field Effects on Excited-State Intramolecular Proton Transfer in 4′-N,N-Dimethylamino-3-hydroxyflavone in Poly(methyl methacrylate) Films

Kazuki Furukawa, Kazuyuki Hino, Norifumi Yamamoto, Kamlesh Awasthi, Takakazu Nakabayashi, Nobuhiro Ohta, Hiroshi Sekiya

研究成果: Article査読

17 被引用数 (Scopus)

抄録

The external electric field effects on the steady-state electronic spectra and excited-state dynamics were investigated for 4′-N,N-(dimethylamino)-3-hydroxyflavone (DMHF) in a poly(methyl methacrylate) (PMMA) film. In the steady-state spectrum, dual emission was observed from the excited states of the normal (N∗) and tautomer (T∗) forms. Application of an external electric field of 1.0 MV·cm-1 enhanced the N∗ emission and reduced the T∗ emission, indicating that the external electric field suppressed the excited-state intramolecular proton transfer (ESIPT). The fluorescence decay profiles were measured for the N∗ and T∗ forms. The change in the emission intensity ratio N∗/T∗ induced by the external electric field is dominated by ESIPT from the Franck-Condon excited state of the N∗ form and vibrational cooling in potential wells of the N∗ and T∗ forms occurring within tens of picoseconds. Three manifolds of fluorescent states were identified for both the N∗ and T∗ forms. The excited-state dynamics of DMHF in PMMA films has been found to be very different from that in solution due to intermolecular interactions in a rigid environment.

本文言語English
ページ(範囲)9599-9608
ページ数10
ジャーナルJournal of Physical Chemistry A
119
37
DOI
出版ステータスPublished - 2015 8 24

ASJC Scopus subject areas

  • 物理化学および理論化学

フィンガープリント

「External Electric Field Effects on Excited-State Intramolecular Proton Transfer in 4′-N,N-Dimethylamino-3-hydroxyflavone in Poly(methyl methacrylate) Films」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル