Browsing by Author "Siddharth Pandey"

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Ionic Liquids as Solvents and/or Catalysts for Organic Synthesis
(Bentham Science Publishers, 2023) Vaishali Khokhar; Shruti Trivedi; Shreya Juneja; Komal; Siddharth Pandey; Gyandshwar K. Rao; Kamalakanta Behera; Kamal Nayan Sharma
Ionic liquids (ILs) are receiving increased enticement from synthetic organic chemists; world-wide due to their extraordinary physicochemical properties. The wide-ranging applications of ionic liquids as solvents and catalysts in organic synthesis are mainly due to their non-volatile nature which arises from very low vapor pressures. Since the past few decades, researchers have explored the efficacy of these designer solvents as green substitutes of toxic and volatile organic solvents for a variety of value added synthetic organic reactions. Furthermore, the tremendous potential of ILs as catalysts is also worth mentioning. Unlike organic solvents of comparable polarity, they often act as catalysts in various organic reactions. Thus, the present chapter aims at observing and exploring the application of ionic liquids as solvents and catalysts in various synthetic organic reactions. The green chemistry aspects of the solvent as well as the catalytic use of ionic liquids in order to develop environmentally benign organic synthesis is also the focus of discussion in this chapter. © 2023 Bentham Science Publishers.
Solvation within deep eutectic solvent-based systems: A review
(Elsevier, 2023) Shruti Trivedi; Shreya Juneja; Vaishali Khokhar; Siddharth Pandey
The deleterious health hazards of organic solvents impelled researchers to explore environmentally benign media with potential applications in science and technology. In this context, a greener alternative, deep eutectic solvent (DES) is reviewed to evaluate its full potential for various chemical processes. This chapter reviews (1) general properties of neoteric environmentally benign DES, (2) the polarity of and solvation dynamics within DESs and DESs-based systems to determine the solute–solvent and solvent–solvent interactions within such systems, (3) significant upshots of surfactant, dye, and ionic liquid (IL) aggregation within DESs and DESs-based systems, (4) the highlights of temperature effect on the physicochemical properties of DESs-based systems. The major methods are based on ultraviolet–visible absorbance, steady-state and time-resolved fluorescence spectroscopy along with other advanced spectroscopic techniques to explore various physicochemical properties associated with such systems. © 2023 Elsevier Inc. All rights reserved.
Unusual aggregation behavior of porphyrin dye tetrakis (4- sulfonatophenylporphyrin) within aqueous deep eutectic solvents
(Elsevier B.V., 2025) Moumita Saha; Ambrish Kumar; Ritik Vishwakarma; Siddharth Pandey; Kamalakanta Behera; Shruti Trivedi
Aggregation behavior and photophysics of an anionic porphyrin dye named tetrakis(4-sulfonatophenyl)porphyrin (TPPS) was studied first time in four different choline chloride based deep eutectic solvents (DESs) i.e., reline, ethaline, glyceline, and maline. In three DESs (reline, ethaline, and glyceline), TPPS mainly remains in monomer form with minute J-aggregates. However, in fourth DES maline, a completely different behavior was observed where TPPS formed extended J- and H-aggregates. Further, effect of change in pH and role of water as additive was assessed through UV–vis molecular absorption and fluorescence emission spectroscopy. It is important to note that pH change showed no effect on TPPS spectra in maline, whereas, addition of water was found to disrupt both J- and H- aggregates. © 2025 Elsevier B.V.