Aggregation-induced emission enhancement in halochalcones

abstract

A family of push-pull fluorophores, consisting of a chalcone core decorated with electron-donating substituents and halogen atoms, was designed and synthesized. Luminescence studies were performed in solution, aggregate form and in the solid state. Although some compounds are only weakly fluorescent in solution, all are emissive in the solid state showing aggregation-induced emission enhancement. In the crystalline state, the halogen atoms are not involved in halogen bonds but their presence strongly influences the aggregation-induced emission properties of the fluorophores.

keywords

SPECTRAL PROPERTIES; CHALCONE; DERIVATIVES; DISCOVERY; DEVICES; DYE

subject category

Chemistry

authors

Vaz, PAAM; Rocha, J; Silva, AMS; Guieu, S

our authors

acknowledgements

This work was developed within the scope of the projects CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM /50011/2013) and UI QOPNA (Ref. FCT UID/QUI/00062/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. Thanks are due to the University of Aveiro and the Portuguese Fundacao para a Ciencia e a Tecnologia (FCT) for funding the Organic Chemistry Research Unit (EXPL/QEQ-SUP/1041/2013) and the Portuguese National NMR Network (RNRMN). SG also thanks the FCT for a post-doctoral grant (SFRH/BPD/70702/2010).

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