Browsing by Author "Ashutosh Kumar Mishra"

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Investigating the spectral and electrochemical properties of novel flavin-pyrene dyads separated via variable spacer
(John Wiley and Sons Ltd, 2023) M. S. S. Vinod Mouli; Harsha Gopal Agrawal; Tarkeshwar Maddeshiya; Arpna Tamrakar; Soumya Ranjan Tripathy; Mrituanjay D. Pandey; Ashutosh Kumar Mishra
The present manuscript describes the synthesis and the photophysical properties of a pair of novel flavin-pyrene dyads where the donor and the acceptor entities are separated via variable spacer. The dyads were well characterized using standard techniques and investigated for their photophysical and electrochemical nature. The observed absorption spectra of the dyads mainly display peaks corresponding to the individual pyrene and flavin units, with some contribution from the flavin entity in the pyrene region. While, strong emission quenching was observed for both the dyads if compared to its individual constituents. However, a careful analysis of the emission spectra and the solvent dependent studies reveals subtle difference between the two dyads. While no significant difference could be observed when excited in the flavin region; excitation at the pyrene region displays a weak and broad emission band in case of closely connected dyad. Further, the electrochemical properties were investigated by cyclic voltammetry and the reduction ability was observed to follow the trend as FlPy2 < FlPy1 < Fl. © 2022 John Wiley & Sons Ltd.
Recent advances in AIEgen-based chemosensors for small molecule detection, with a focus on ion sensing
(Royal Society of Chemistry, 2024) Surabhi Asthana; M. S. S. Vinod Mouli; Arpna Tamrakar; Manzoor Ahmad Wani; Ashutosh Kumar Mishra; Rampal Pandey; Mrituanjay D. Pandey
Since the aggregation-based emission (AIE) phenomenon emerged in 2001, numerous chemical designs have been built around the AIE concept, displaying its utility for diverse applications, including optics, electronics, energy, and biosciences. The present review critically evaluates the broad applicability of AIEgen-based chemical models towards sensing small analytes and the structural design strategies adjusting the mode of action reported since the last decade. Various AIEgen models have been discussed, providing qualitative and quantitative estimation of cationic metal ions and anionic species, as well as biomolecular, cellular, and organelle-specific probes. A systematic overview of the reported structural design and the underlying working mode will pave the way for designing and developing the next generation of AIEgens for specific applications. © 2024 The Royal Society of Chemistry.
The nucleobase assisted pyrene functionalization of gold nanoparticles
(Royal Society of Chemistry, 2021) M. S. S. Vinod Mouli; Arpna Tamrakar; Mrituanjay D. Pandey; Ashutosh Kumar Mishra
Herein, we report the functionalization of gold nanoparticles with a pyrene fluorophore via a connecting nucleobase spacer. The resulting gold nanoparticles display inherent photoluminescence behavior and are not quenched by gold nanoparticle surface plasmons. The appearance of excimer emission corresponding to pyrene supports the proposed arrangement of the pyrene entity on the gold surface in a close-packed manner. This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.