@article{42de0265a0b84dbe9e37c6015f2e3b07,
title = "Enhancing Single-Crystal Dichroism of an Asymmetric Azo Chromophore by Perfluorophenyl Embraces and Boron Coordination",
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. ",
author = "Gonzalo Campillo-Alvarado and Liu, {Rachel J.} and Davies, {Daniel W.} and Ying Diao",
note = "Funding Information: G.C.-A. acknowledges financial support from The Office for Access and Equity, the DRIVE Committee, and the Illinois Materials Research Center (University of Illinois at Urbana-Champaign) through the DRIVE Distinguished Postdoctoral Fellowship. G.C.-A. and Y.D. acknowledge partial support by the NSF MRSEC: Illinois Materials Research Center under Grant No. DMR 17-20633. Y.D. and D.W.D. acknowledge the Sloan Foundation for a Sloan Research Fellowship in Chemistry and a 3M Nontenured Faculty Award. We thank Dr. Danielle Gray and Dr. Toby J. Woods for help with single-crystal X-ray diffraction experiments and for helpful discussions. This work was conducted in part in the George L. Clark X-ray Facility and 3M Materials Laboratory. Publisher Copyright: {\textcopyright} Authors 2021",
year = "2021",
month = jun,
day = "2",
doi = "10.1021/acs.cgd.1c00114",
language = "English (US)",
volume = "21",
pages = "3143--3147",
journal = "Crystal Growth and Design",
issn = "1528-7483",
publisher = "American Chemical Society",
number = "6",
}