Unlocking the potential of 2,1,3-benzoxadiazole-based luminescent liquid crystals

被引：6

作者：

da Silva, Fabricia Nunes ^{[1
]}

Silva, Eliane Oliveira ^{[1
]}

dos Santos, Gerson ^{[2
]}

Postacchini, Bruna B. ^{[2
]}

Cazati, Thiago ^{[2
]}

Bechtold, Ivan H. ^{[3
]}

Vieira, Andre Alexandre ^{[1
]}

机构：

[1] Univ Fed Bahia, Inst Quim, Salvador, Brazil

[2] Univ Fed Ouro Preto, Dept Fis, Ouro Preto, Brazil

[3] Univ Fed Santa Catarina, Dept Fis, Florianopolis, Brazil

来源：

LIQUID CRYSTALS | 2023年 / 50卷 / 11-12期

关键词：

2; 1; 3-benzoxadiazoles; fluorescence; liquid crystals; solvatochromism; FLUORESCENT-PROBE; BENZOTHIADIAZOLE; HOMOCYSTEINE; MOLECULES; 2,1,3-BENZOTHIADIAZOLE; HETEROCYCLE; DERIVATIVES; HETEROATOM; POLYMER; NBD;

D O I：

10.1080/02678292.2023.2202160

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Here, we report the synthesis and characterisation of 2,1,3-benzoxadiazole-based (BOX) luminescent liquid crystals with a pi-conjugated core and different elongated donor units connected by triple bonds. These molecules exhibited calamitic thermotropic mesomorphism with nematic and smectic phases and intense photoluminescence under UV-vis light excitation in solutions and films. In solution, the emission revealed a maximum in the yellow region (502 to 590 nm), similar to that of benzothiadiazoles (BTD) homologous, but with fluorescence quantum, it yields significantly higher (phi(PL) = 0.30-54). The nature of donor unit substantially influenced the quantum yields and excited state lifetimes. Solvatochromism studies showed a dependence of the emission, quantum yield and lifetimes with the polarity of the solvent. This work demonstrates that 2,1,3-benzoxadiazole core derivatives have thermal and photophysical properties similar to BTDs but with superior quantum efficiency.

引用

页码：1688 / 1698

页数：11

共 38 条

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