6533b85bfe1ef96bd12bb501
RESEARCH PRODUCT
Alkyloxy modified pyrene fluorophores with tunable photophysical and crystalline properties
Marco SacconeHassan EslahiHassan EslahiAndreas KapfMichael GieseMeik BlankeMarcel Albrechtsubject
ChemistryChemieSonogashira coupling02 engineering and technologyGeneral ChemistryChromophore010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistryExcimer01 natural sciencesFluorescenceCatalysis0104 chemical sciencesLiquid crystals Luminophore pyrene crystal packingchemistry.chemical_compoundMaterials ChemistryMoleculePyreneEmission spectrumSettore CHIM/07 - Fondamenti Chimici Delle TecnologieAbsorption (chemistry)0210 nano-technologydescription
Novel alkyloxy modified 2,7-di-tert-butyl-4,5,9,10-tetra(arylethynyl)pyrenes were prepared through a straightforward Sonogashira coupling approach. Optical properties such as quantum yields and absorption/emission spectra of the fluorophores were investigated by UV/Vis and fluorescence measurements. Aggregation induced excimer formation of the chromophores in polar solvents and in the solid state was proved by the presence of a characteristic bathochromically shifted emission band and a decrease of the emission capability. These results strongly indicate the unexpected observation that the excimer formation of adjacent pyrene rings is not prevented by the introduction of bulky tert-butyl substituents. Single-crystal X-ray and computational analyses reveal the co-planar alignment of adjacent molecules and the presence of π–π-stacking in the molecular packing of the pyrene polyaromatics. Furthermore, fluorescence, DSC and POM measurements indicate that the aggregation behaviour, the thermal characteristics and the crystalline properties are significantly influenced by changing structural features of the attached functional groups at the periphery of the pyrene core.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |