Dual fluorescence and intramolecular charge transfer with crystalline 4 - (diisopropylamino)benzonitrile

Sergey I. Druzhinin, Attila Demeter, Klaas A. Zachariasse

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Abstract

Dual fluorescence from a locally excited (LE) and an intramolecular charge transfer (ICT) state is observed with 4-(diisopropylamino)benzonitrile (DIABN) crystals, from 80 down to -110 °C. With crystalline 4-(methylamino)benzonitrile (MABN) only LE emission is observed over this temperature range. Crystals of 4-(dimethylamino)benzonitrile (DMABN) at room temperature mainly show LE fluorescence, whereas the red-shifted structured phosphorescence increases in importance upon cooling. Its spectral shape resembles that of DMABN phosphorescence in low-temperature glassy media, red-shifted by around 2800cm-1. The ICT fluorescence of DIABN crystals at -110 °C has a risetime of 55 ps, which becomes shorter with increasing temperature.

Original languageEnglish
Pages (from-to)421-428
Number of pages8
JournalChemical Physics Letters
Volume347
Issue number4-6
DOIs
Publication statusPublished - Oct 26 2001

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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