Cited by 20Luminescence and Fluorescent MaterialsPhotochemistry and Electron Transfer StudiesPorphyrin and Phthalocyanine Chemistry

Solid‐State Emission from Mono‐ and Bichromophoric Boron Dipyrromethene (BODIPY) Derivatives and Comparison with Fluid Solution

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Bozdemir, Özgür Altan, Al‐Sharif, Hatun H. T., McFarlane, William, Waddell, Paul G., Benniston, Andrew C., Harriman, Anthony·2019·Chemistry – A European Journal

Abstract

The syntheses and crystal structures of sterically crowded mono‐ and bichromophoric BODIPY‐based dyes are reported. The “monomeric” compound is weakly fluorescent in the liquid phase due to fast internal conversion associated with rotation of aryl rings at the boron atom. The side‐by‐side “dimer” exhibits weak excitonic coupling between the dipyrrin units and is much more emissive in fluid solution. Solid samples of both molecular entities are strongly fluorescent under near‐UV illumination. Thus, the mono‐chromophore exhibits dual fluorescence from what appears to be a mixture of crystalline and possibly amorphous (or interfacial regions) distributions. The bi‐chromophore packs in the crystal as pairs of chromophores with each unit being provided by a different molecule. This leads to excitonic splitting and the formation of a strong H‐band in the absorption spectrum. Fluorescence occurs from the corresponding J‐species and also from what appears to be an aggregated state associated with interfacial areas. Both bulk and interface‐bound states show relatively long‐lived fluorescence while the crystal structures indicate the likelihood for fast electronic energy migration between molecules.

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Crossref · 10.1002/chem.201903902

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Authors
Bozdemir, Ö. A., Al‐Sharif, H. H. T., McFarlane, W., Waddell, P. G., Benniston, A. C., & Harriman, A.
Affiliations
  • Atatürk University (TR)
  • Newcastle University (GB)
Corresponding author
Harriman, Anthony
Venue
Chemistry – A European Journal
Publisher
Wiley
Published
2019-11-07
Volume
25
Issue
68
Pages
15634-15645
ISSN
  • 0947-6539 (ISSN-L)
  • 1521-3765
OpenAlex
W2978492934
Cited by
20
References
133
Citations by year
2024: 4 · 2023: 3 · 2022: 4 · 2021: 1 · 2020: 7 · 2019: 1
FWCI
1.17
Type
journal article
Language
en
Open access
Locations
  • Chemistry - A European Journal (publishedVersion)
  • PubMed (publishedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Materials Science › Materials Chemistry › Porphyrin and Phthalocyanine Chemistry
Keywords
boron dipyrromethene, BODIPY dyes, solid-state fluorescence, crystal packing, excitonic coupling, H-band, J-aggregates, interfacial states, internal rotation, chromophore dimers, amorphous regions

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