Abstract
AbstractSynthesis and properties of anthracene‐based cyclic π‐clusters which possess two and four anthracene units are discussed. The optimal cyclization conditions were determined based on a nickel(0)‐mediated reaction that afforded a cyclic anthracene dimer as the major product. Bringing two anthracene planes in close proximity in a face‐to‐face manner resulted in red‐shifted absorption owing to the narrowing of the HOMO–LUMO gap. The cyclic anthracene dimer exhibits multi‐stimuli responsiveness due to high π‐congestion. For example, photoirradiation on the anthracene dimer affords its photoisomer having C−C bonds that are longer than 1.65 Å, which can undergo thermal reversion under gentle heating. This enabled mechanochromism of the photoisomer (colorless) to the original anthracene dimer (red). Photoisomerization was also observed in the crystalline state, accompanied by crystal jumping or collapsing, that is, the photosalient effect.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.