Aggregation-Induced Emission and Sensing Characteristics of Triarylborane-Oligothiophene-Dicyanovinyl Triads.
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.
Inorganic and Physical Chemistry Department (IPC), Indian Institute of Science (IISc), Bangalore, 560012, India.
George Rajendra
GR
Kumar
Inorganic and Physical Chemistry Department (IPC), Indian Institute of Science (IISc), Bangalore, 560012, India.
Samir Kumar
SK
Sarkar
Inorganic and Physical Chemistry Department (IPC), Indian Institute of Science (IISc), Bangalore, 560012, India.
Pakkirisamy
P
Thilagar
aggregation-induced emission enhancement; anion discriminators; fluorescence; sensors; triarylborane