Molecular aggregation stimulated tunable emission behaviour of functionalized 1,8-naphthalimides

被引：6

作者：

Sonalin, Srinita ^{[1
]}

Pandikassala, Ajmal ^{[1
]}

Dheepika, Ramachandran ^{[1
]}

Imran, P. K. Mohamed ^{[2
]}

Nagarajan, Samuthira ^{[1
]}

机构：

[1] Cent Univ Tamil Nadu, Dept Chem, Thiruvarur 610005, India

[2] Islamiah Coll, Dept Chem, Vaniyambadi 635752, India

来源：

JOURNAL OF LUMINESCENCE | 2019年 / 215卷

关键词：

Naphthalimides; Aggregates; Interfacial assembly; Nanoparticles; Tunable emission; INTRAMOLECULAR CHARGE-TRANSFER; MULTIPLE CHROMISMS; ENHANCED EMISSION; SELF-ORGANIZATION; DERIVATIVES; TETRAPHENYLETHENE; NAPHTHALIMIDE; IMPACT;

D O I：

10.1016/j.jlumin.2019.116699

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The integrated influence of linkers and solvent polarity on tuning the emission of 1,8-naphthalimide (NI) aggregates is investigated. Naphthalimides are systematically functionalized with vinyl, ethynyl and direct link connecting conjugated aromatic units via Pd-catalyzed cross coupling reactions. The molecules self-assembled as nano-aggregates in binary solvent system and exhibited aggregation induced enhanced emission. Field emission scanning electron microscopy and dynamic light scattering analysis proved the well-defined nanostructured morphology of the NI aggregates. Fluorescence life-time studies demonstrated the effect of aggregation on their radiative and non-radiative decay rates. Among the compounds synthesized, ethynyl linked NI exhibited significantly enhanced emission due to the limited intermolecular motion. A binary solvent system comprising of tetrahydrofuran/H2O facilitated enhanced emission and higher quantum yield of the NI in their aggregated phase. Detailed photophysical and computational studies of the compounds indicated that structural variation and solvent polarity together have a significant impact on tuning the emission behaviour of NIs.

引用

页数：10

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