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Aggregation‐Induced Emission and Sensing Characteristics of Triarylborane–Oligothiophene–Dicyanovinyl Triads
Author(s) -
Kumar George Rajendra,
Sarkar Samir Kumar,
Thilagar Pakkirisamy
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201603349
Subject(s) - aggregation induced emission , thiophene , absorption (acoustics) , chemistry , solvent , photochemistry , aqueous solution , terthiophene , materials science , organic chemistry , optics , fluorescence , physics , composite material
The design, synthesis and aggregation‐induced emission properties of a new series of triarylborane–oligothiophene–dicyanovinyl (DCV) conjugates 4 – 6 (A–D–A’ type molecular configuration) are reported. The optical properties of 4 – 6 can be modulated by judiciously varying the number of thiophene units between electron deficient boryl and dicyanovinyl units. Compound 6 with terthiophene spacer showed highly red‐shifted absorption and emission compared to 5 and 4 with bithiophene and monothiophene spacers, respectively. Compounds 5 and 6 show aggregation‐induced emission enhancement in water/THF mixtures. Compounds 5 and 6 also showed solvent viscosity dependent emission characteristics. All the three compounds show distinct optical responses for small anions such as fluoride and cyanide. Filter paper strips coated with compounds 5 and 6 can detect F − and CN − in aqueous media with different colorimetric responses.