title: Aggregation induced phosphorescent N-oxyde-2,2'-bipyridine bismuth complexes and polymorphism-dependent emission.
abstract: Unprecedented bismuth complexes, based on the rarely used ditopic ligand N-oxide-2,2'-bipyridine (bp2mo), crystallizing as three polymorphs, α- (), β- () and γ-[BiBr3(bp2mo)2] (), exhibit phosphorescence with a quantum yield up to 17% for the crystal phase (), while the complex displays a weak fluorescence in solution. A study of the luminescence properties combined with DFT/TDDFT calculations reveals that the lighting phenomenon originated by aggregation induced phosphorescence correlated with the weak intermolecular interactions present in the different crystal phases.
authors.affiliation: MOLTECH-Anjou UMR-CNRS 6200, 2 Bd Lavoisier, 49045 Angers, France. nicolas.mercier@univ-angers.fr.
authors.forename: Oksana
authors.initials: O
authors.lastname: Toma
authors.forename: Nicolas
authors.initials: N
authors.lastname: Mercier
authors.forename: Magali
authors.initials: M
authors.lastname: Allain
authors.forename: Alessandra
authors.initials: A
authors.lastname: Forni
authors.forename: Francesco
authors.initials: F
authors.lastname: Meinardi
authors.forename: Chiara
authors.initials: C
authors.lastname: Botta