@cusb.ac.in
Department of Chemistry
Central University of South Bihar India
Chemistry, Organic Chemistry, General Chemistry, Agricultural and Biological Sciences
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Samridhi Patel, Gopal Kumar Mahato, and Girish Chandra
Elsevier BV
Girish Chandra, Durg Vijay Singh, Gopal Kumar Mahato, and Samridhi Patel
Springer Science and Business Media LLC
Jitendra Modi, Samridhi Patel, Gopal Kumar Mahato, Birkishore Mahto, and Girish Chandra
Wiley
AbstractHere we present the synthesis of a new fluorinated pyridyl‐azo dye and demonstrate an effective way to convert monomer fluorinated pyridyl‐azo dye to H‐aggregated form through UV‐light induced trans‐cis‐trans photoisomerization. And upto a 12 : 88 ratio between monomer : aggregation was achieved through a small pulse of UV irradiation. The H‐aggregation shows a unique high extinction co‐efficient in UV‐visible absorbance and unexpected fluorescence emission with a remarkably large Stokes shift. The solvent DMF and fluorine substituent were found to have a critical role in aggregation. 1H, 19F NMR, and 19F‐DOSY NMR experiments were used to confirm the aggregation and also confirm the absence of π‐π stacking.
Girish Chandra, Gopal Kumar Mahato, and Samridhi Patel
Elsevier