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A polymorphic fluorescent material with strong solid state emission and multi-stimuli-responsive properties

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Abstract

A bright difluoroboron β-diketonate derivative 1 showing four emission colors (green, yellow, orange and red) with high quantum yields (41–74%) in four polymorphs and one amorphous state is reported. Green-emissive crystals (1-G and 1-G′) exhibit dimeric aggregation structures due to the strong molecular π–π interaction but exhibit hypsochromic emission compared to yellow-emissive crystals (1-Y) with monomeric aggregation because of lacking such π–π interactions. These novel emission phenomena are rationalized by theoretical calculations. High fluorescence sensitivity of compound 1 to its molecular packing modes results in excellent responsive behavior to multiple external stimuli thereby showing reversible change of emission colors under mechanical grinding, heating, solvent fuming and hydrostatic pressure.

Graphical abstract: A polymorphic fluorescent material with strong solid state emission and multi-stimuli-responsive properties

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Publication details

The article was received on 12 Aug 2019, accepted on 28 Sep 2019 and first published on 30 Sep 2019


Article type: Research Article
DOI: 10.1039/C9QM00518H
Mater. Chem. Front., 2020, Advance Article

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    A polymorphic fluorescent material with strong solid state emission and multi-stimuli-responsive properties

    J. Zhu, C. Li, P. Chen, Z. Ma, B. Zou, L. Niu, G. Cui and Q. Yang, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QM00518H

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