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From the same journal

Excited-State Aromatic Interactions in the Aggregation-Induced Emission of Molecular Rotors

Research output: Contribution to journalArticle

Published copy (DOI)

Author(s)

  • Jiri Sturala
  • Marc K Etherington
  • Aisha N Bismillah
  • Heather F Higginbotham
  • William Trewby
  • Juan A Aguilar
  • Elizabeth H C Bromley
  • Alyssa-Jennifer Avestro
  • Andrew P Monkman
  • Paul R McGonigal

Department/unit(s)

Publication details

JournalJournal of the American Chemical Society
DateAccepted/In press - 11 Aug 2017
DateE-pub ahead of print - 18 Nov 2017
DatePublished (current) - 13 Dec 2017
Issue number49
Volume139
Number of pages8
Pages (from-to)17882-17889
Early online date18/11/17
Original languageEnglish

Abstract

Small, apolar aromatic groups, such as phenyl rings, are commonly included in the structures of fluorophores to impart hindered intramolecular rotations, leading to desirable solid-state luminescence properties. However, they are not normally considered to take part in through-space interactions that influence the fluorescent output. Here, we report on the photoluminescence properties of a series of phenyl-ring molecular rotors bearing three, five, six, and seven phenyl groups. The fluorescent emissions from two of the rotors are found to originate, not from the localized excited state as one might expect, but from unanticipated through-space aromatic-dimer states. We demonstrate that these relaxed dimer states can form as a result of intra- or intermolecular interactions across a range of environments in solution and solid samples, including conditions that promote aggregation-induced emission. Computational modeling also suggests that the formation of aromatic-dimer excited states may account for the photophysical properties of a previously reported luminogen. These results imply, therefore, that this is a general phenomenon that should be taken into account when designing and interpreting the fluorescent outputs of luminescent probes and optoelectronic devices based on fluorescent molecular rotors.

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