title: Highly emissive metal-organic framework composites by host-guest chemistry.
abstract: The unique host-guest chemistry of metal-organic frameworks (MOFs) can be used to implement additional properties by loading the cavities with functional molecules or even nanoparticles. We describe the gas-phase loading of MOFs featuring either a three-dimensional (MOF-5, MOF-177 and UMCM-1) or one-dimensional channel system (MIL-53(Al)) with the highly emissive perylene derivative N,N-bis(2,6-dimethylphenyl)-3,4:9,10-perylene tetracarboxylic diimide (DXP) or an iridium complex, (2-carboxypyridyl)bis(3,5-difluoro-2-(2-pyridyl)phenyl)iridium(III) (FIrpic). The resulting host-guest composites show strong luminescence, with their optical properties being dominated by the guest species. DXP-loaded MOFs exhibit a high stability towards guest displacement by solvent molecules, while the interaction of FIrpic with the host is weaker. The emissive properties of intercalated DXP also indicate host-guest interactions such as caging effects, strong quenching of the MOF host emission, as well as aggregate formation.
authors.affiliation: Chair of Inorganic Chemistry II-Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44870, Bochum, Germany.
authors.forename: Maike
authors.initials: M
authors.lastname: Müller
authors.forename: André
authors.initials: A
authors.lastname: Devaux
authors.forename: Cheng-Han
authors.initials: CH
authors.lastname: Yang
authors.forename: Luisa
authors.initials: L
authors.lastname: De Cola
authors.forename: Roland A
authors.initials: RA
authors.lastname: Fischer