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Title: A new pyrrolyl-pyranone based AIEgen with solution solid dual emissive property
Authors: Jha, Ajay Kumar
Purohit, Deepak
Sharma, Chandra Prakash
Gupta, Neeraj Mohan
Rawat, Kundan Singh
Goel, Atul
Keywords: AIEgen;Luminogens;Pyranones;Solution-solid dual emissive (SSDE);Restriction in rotation (RIR)
Issue Date: Feb-2019
Publisher: NISCAIR-CSIR, India
Abstract: The design and synthesis of organic molecules having aggregation induced emission (AIE) property has been a prime area of research in recent years. In this regard, we have synthesized new pyranone based AIEgens with interesting photophysical properties. The synthesized donor-acceptor based pyranones 3 and 4a-d show multicolour emission in the range of 476-585 nm in solid state. The compound 3 also showed blue emission (485 nm) in DMSO solution and surprisingly exhibits orange emission (572 nm) with remarkable bathochromic shift in 99% water in DMSO due to AIE characteristics. The detailed study of AIE behaviour of 3 was carried out in increasing fraction of water (0-99%) in THF, the intensity of emission at 485 nm gradually increased upto 80% of water and then decreased at 90% water. Interestingly, the THF solution of 3 in 99% water showed remarkable bathochromic shift (~100 nm) of emission maximum from blue (λmax 485 nm) to orange region (λmax 585 nm) due to formation of nano-aggregates leading to restriction in intramolecular rotation (RIR). The time-correlated single photon counting (TCSPC) analysis of 3 in the water−THF (99:1) mixture showed an average lifetime of 4.8 ns for these nano-aggregates. The pyrrolyl-pyranone 3 having Solution-Solid Dual Emissive (SSDE) characteristics may be utilized in exploring its application in both biomedical and material research fields.
Page(s): 192-199
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.58B(02) [February 2019]

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