title: Study of the photobehavior of a newly synthesized chiroptical molecule: (E)-(R(p),R(p))-1,2-bis{4-methyl-[2]paracyclo[2](5,8)quinolinophan-2-yl}ethene.
abstract: A new chiroptical compound, (E)-(R(p),R(p))-1,2-bis{4-methyl-[2]paracyclo[2](5,8)quinolinophan-2-yl}ethene (trans-RPQE) has been synthesized, and its photoresponse has been investigated through steady state and time-resolved absorption and emission spectroscopies and theoretical calculations. To elucidate the relaxation mechanism of trans-RPQE after photoexcitation, the photophysics of the 2,4-dimethyl-[2]paracyclo[2](5,8)quinolinophane chromophore has also been studied. The quantum yields of the different relaxation paths for trans-RPQE have been determined. It emerges that in addition to thermal and radiative routes, trans-RPQE also photoisomerizes with a quantum yield of 8%. Trans- and cis-RPQE isomers are pseudoenantiomers exhibiting appreciably different CD spectra, whereby RPQE can be a model for the design of new promising chiroptical photoswitches.
authors.affiliation: Dipartimento di Chimica, Via Elce di Sotto, 8, Universita di Perugia (PG), Italy. pierluigi.gentili@unipg.it
authors.forename: Pier Luigi
authors.initials: PL
authors.lastname: Gentili
authors.forename: Laura
authors.initials: L
authors.lastname: Bussotti
authors.forename: Renzo
authors.initials: R
authors.lastname: Ruzziconi
authors.forename: Sara
authors.initials: S
authors.lastname: Spizzichino
authors.forename: Paolo
authors.initials: P
authors.lastname: Foggi