title: Flavylium based dual photochromism: addressing cis-trans isomerization and ring opening-closure by different light inputs.
abstract: The multistate system of 4',7-dihydroxy-3-methoxyflavylium is constituted by a multiequilibrium involving trans-chalcone, cis-chalcone, hemiketal, flavylium cation and quinoidal base. This system possesses two independently addressable inter-connected photochromic systems based on the cis-trans isomerization and ring opening-closure of the hemiketal.
authors.affiliation: LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal. fp@fct.unl.pt.
authors.forename: Sandra
authors.initials: S
authors.lastname: Gago
authors.forename: Nuno
authors.initials: N
authors.lastname: Basílio
authors.forename: Artur J
authors.initials: AJ
authors.lastname: Moro
authors.forename: Fernando
authors.initials: F
authors.lastname: Pina