Metal-Organic Framework with Color-Switching and Strongly Polarized Emission

Hui Wang, Sergei Igorevich Vagin, Stephen Lane, Wei Lin, Vira Shyta, Werner Reinhold Heinz, Colin Van Dyck, Adam Johan Bergren, Kirsty Gardner, Bernhard Rieger, Alkiviathes Meldrum

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Hybrid fluorescent metal-organic frameworks (MOFs) use long-range intermolecular structural motifs in which the properties of the scaffold molecular system can be designed for specific applications. In this work, we constructed a MOF-chromophore system with a strongly polarized fluorescence and a large emission wavelength shift. To achieve this, we first devised a fluorophore with a linear conjugated backbone, bulky and noninteracting side chains, and easily accessible nitrogen atoms on its pyridine end groups. The linear nature of the conjugated backbone can lead to a strongly polarized luminescence, the side groups assist structural stability and minimize intermolecular interactions, and the sterically accessible pyridines provide a large fluorescence color-changing ability. These features were demonstrated by synthesizing a planar Zn-based MOF in which the linear backbone of the chromophore molecules was highly aligned. The MOFs demonstrated a strong polarization effect and a color-shifting ability from green-yellow to orange. The results show that hybrid metal-organic materials can be designed to generate a strong command of the material luminescence, in terms of both emission color and polarization.

Original languageEnglish
Pages (from-to)5816-5823
Number of pages8
JournalChemistry of Materials
Volume31
Issue number15
DOIs
StatePublished - 13 Aug 2019

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