Synthesis and Photophysical Properties of α‐Pyrone‐fused‐pyrido[3,  2, 1‐jk]carbazolone Derivatives : DFT/TD‐DFT Insights. Issue 16 (24th April 2018)

• Record Type: Journal Article
• Authors: Ahuja, Monika; Biswas, Soumen; Sharma, Pratibha; Samanta, Sampak
• Is Part Of: ChemistrySelect. Volume 3:Issue 16(2018)
• Page Start: 4354
• Page End: 4360
• Publication Date: 2018-04-24
• Subjects: Fluorescence decay -- High quantum yield -- Photophysical properties -- α-Pyrone-fused-pyrido carbazolone -- Theoretical studies; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201800369
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The present paper discloses an interesting microwave‐assisted solvent‐free protocol for the synthesis of thermally stable, highly fluorescent pyrano[2′, 3′:4, 5]pyrido[3, 2, 1‐ jk ]carbazole‐5, 8‐diones in good to high yields with good quantum yields (Ø ≥ 0.70) through a [3+3] annulation reaction of aryl‐substituted Morita‐Baylis‐Hillman acetates with a 4‐hydroxy‐6 H ‐pyrido[3, 2, 1‐ jk ]carbazol‐6‐one in the presence of Hünig's base. The solvatochromic properties of synthesized compounds have been determined which showed blue shifts in absorption and emission spectra with increasing the polarity of solvents. Similarly, the higher quantum yields were also observed in case of non‐polar solvents as compared to polar ones. Interestingly, the experimental results of photophysical properties were in good agreement with theoretical data obtained using B3LYP/6‐311G++(d, p) level of theory. Furthermore, the synthesized chromophoric scaffolds exhibited good thermal stability (342‐387 °C) and average fluorescence lifetime in the range of 2.011‐2.139 ns for 408 nm, 2.268‐2.277 ns for 428 nm. Abstract : Microwave‐assisted one‐pot synthesis of thermally stable, highly fluorescent pyrano[2′, 3′:4, 5]pyrido[3, 2, 1‐ jk ]carbazole‐5, 8‐diones in good to high yields with good quantum yields (Ø ≥ 0.70) has been developed. The experimental results of photophysical properties of synthesized scaffolds were in good agreement with theoretical data obtained using DFT and TD‐DFT at B3LYP/6‐311G++(d, p) level of theory.