A polymorphic fluorescent material with strong solid state emission and multi-stimuli-responsive properties†,Materials Chemistry Frontiers

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A polymorphic fluorescent material with strong solid state emission and multi-stimuli-responsive properties†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2019-09-30 , DOI: 10.1039/c9qm00518h
Ji-Yu Zhu _{1,

2,

3,

4,

5} , Chun-Xiang Li _{2,

3,

4,

5,

6} , Peng-Zhong Chen _{1,

2,

3,

4,

5} , Zhiwei Ma _{7,

8,

9,

10,

11} , Bo Zou _{7,

8,

9,

10,

11} , Li-Ya Niu _{1,

2,

3,

4,

5} , Ganglong Cui _{2,

3,

4,

5,

6} , Qing-Zheng Yang _{1,

2,

3,

4,

5}

Affiliation

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.

中文翻译：

具有强固态发射和多刺激响应特性的多态荧光材料†

据报道，一种明亮的二氟硼β-二酮硼酸酯衍生物1显示四种发光颜色（绿色，黄色，橙色和红色），具有四种多晶型物和一种非晶态的高量子产率（41-74％）。绿色发光晶体（1-G和1-G'）由于分子之间的强π-π相互作用而表现出二聚体聚集结构，但与具有单体聚集的黄色发光晶体（1-Y）相比，由于缺少π而表现出七色发射–π相互作用。这些新颖的排放现象通过理论计算得到了合理化。化合物1的高荧光敏感性其分子堆积模式可对多种外部刺激产生出色的响应行为，从而在机械研磨，加热，溶剂发烟和静水压力下显示出可逆的发射颜色变化。

更新日期：2019-12-19

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