Enhancing Single-Crystal Dichroism of an Asymmetric Azo Chromophore by Perfluorophenyl Embraces and Boron Coordination

Gonzalo Campillo-Alvarado, Rachel J. Liu, Daniel W. Davies, Ying Diao

Research output: Contribution to journalArticlepeer-review

Abstract

We describe the use of perfluorophenyl embraces and boron coordination (B ← N) to enhance dichroism in single crystals of an asymmetric azo chromophore. Specifically, a tripod-shaped boron adduct comprised of tris(pentafluorophenyl)borane (BCF) and 4-phenylazopyridine (4PAzP) self-assembles as supramolecular helices through perfluorophenyl embraces, wherein the azo chromophores are aligned in parallel through B ← N bonds. The alignment of molecular transition dipole moments in (BCF)·(4PAzP) results in enhanced dichroism compared to pure 4PAzP as confirmed by polarized optical microscopy. The study offers a novel supramolecular strategy to enhance dichroism in single-crystalline materials.

Original languageEnglish (US)
Pages (from-to)3143-3147
Number of pages5
JournalCrystal Growth and Design
Volume21
Issue number6
DOIs
StatePublished - Jun 2 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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