ArticleChemical science2021
Room-temperature phosphorescence of a supercooled liquid: kinetic stabilisation by desymmetrisation.
Article in Chemical science, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Vapor-induced miscibility switching and optical response in a functional molecular liquid-pillar[5]arene system.Chemical science · 2026Article
- Color-Pure Organic Luminophores: Characteristics, Definitions, Physical Basis and Fundamental Design Principles.Angewandte Chemie (International ed. in English) · 2026Review
- Luminescent core-isolated solvent-free liquids as a soft material platform for optical gas sensing.Chemical science · 2026Article
- Fast and efficient room-temperature phosphorescence from metal-free organic molecular liquids.Chemical science · 2025Article
- Room-Temperature Phosphorescence Vapochromism through Conformational Control.Journal of the American Chemical Society · 2025Article
- Fast, efficient, narrowband room-temperature phosphorescence from metal-free 1,2-diketones: rational design and the mechanism.Chemical science · 2024Article
- Robust Supercooled Liquid Formation Enables All-Optical Switching Between Liquid and Solid Phases of TEMPO.ACS omega · 2024Article
- Photoinduced crystal melting with luminescence evolution based on conformational isomerisation.Chemical science · 2023Article
- Halide-containing organic persistent luminescent materials for environmental sensing applications.Chemical science · 2022Review
- Modulating Room-Temperature Phosphorescence-To-Phosphorescence Mechanochromism by Halogen Exchange.Frontiers in chemistry · 2021Article
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Authors and funding
3 authors.
Funding
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Abstract
Achieving organic room-temperature phosphorescence (RTP) in a solvent-free liquid state is a challenging task because the liquid state provides a less rigid environment than the crystal. Here, we report that an unsymmetrical heteroaromatic 1,2-diketone forms an organic RTP liquid. This diketone exists as a kinetically stable supercooled liquid, which resists crystallisation even under pricking or shearing stresses, and remains as a liquid for several months. The unsymmetrical diketone core is flexible, with eight distinct conformers possible, which prevents nucleation and growth for the liquid-solid transition. Interestingly, the thermodynamically stable crystalline solid-state was non-emissive. Thus, the RTP of the diketone was found to be liquiefaction-induced. Single-crystal X-ray structure analysis revealed that the diminished RTP of the crystal is due to insufficient intermolecular interactions and restricted access to an emissive conformer. Our work demonstrates that flexible unsymmetrical skeletons are promising motifs for bistable liquid-solid molecular systems, which are useful for the further development of stimuli-responsive materials that use phase transitions.
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