Sunita Rajamani
@sjc.ac.in
Assistant Professor - Department of Chemistry
St Joseph's University, Bengaluru
EDUCATION
PhD - University of Pisa
MSc - National Institute of Rourkela, India
RESEARCH INTERESTS
Ionic Liquid, Waste Management, Biomass Conversion, Catalysis, Electrocatalysis
Scopus Publications
Scopus Publications
Sunita Rajamani, Sai Sri Navya Kolla, Ramya Gudivada, Revathi Raghunath, Karishma Ramesh, and Sushilkumar A. Jadhav
Springer Science and Business Media LLC
K.J. Jisha, Sunita Rajamani, Dharmendra Singh, Gyanendra Sharma, and Ramesh L. Gardas
Elsevier BV
Sunita Rajamani, Rosemary Santhosh, Revathi Raghunath, and Sushilkumar A. Jadhav
Springer Science and Business Media LLC
Gyanendra Sharma, Dharmendra Singh, Sunita Rajamani, and Ramesh L. Gardas
Wiley
The solvation strength of N,N-dialkylethanolammonium based protic ionic liquids (PILs) have been determined by normalised Reichardt's parameter (ETN ) and molecular polarizability (αP). The solvation strength depends on the intermolecular interactions which are governed by the functional group and molecular structure of the species. So here in this work, the influence of functional groups such as –OH, –RCOOH and –R, on solvatochromic parameters of studied PILs have been discussed in terms of experimental results and relevant literature. Further the intermolecular interactions of PILs have been analyzed with the help of temperature dependant experimental refractive index data. Additionally, a positive correlation was obtained between the polarity and the refractive index of the studied PILs.
S. Pradhan, S. Rajamani, G. Agrawal, M. Dash, and S.K. Samal
Elsevier
Olga Russina, Ruggero Caminiti, Alessandro Triolo, Sunita Rajamani, Bernardo Melai, Alessandra Bertoli, and Cinzia Chiappe
Elsevier BV
Cinzia Chiappe, Sunita Rajamani, and Felicia D'Andrea
Royal Society of Chemistry (RSC)
Bronsted acidic ionic liquids (ILs) have been synthesized and investigated as catalysts in esterification and transesterification reactions: simple and non-corrosive salts characterized by aliphatic cations associated with an “acidic” anion (in particular, [HSO4]−) gave the higher yields. A quite good correlation between IL acidity (H0) and catalytic ability was found although also the hydrophilic nature of the ionic medium probably affects the process efficiency.
Cinzia Chiappe and Sunita Rajamani
Walter de Gruyter GmbH
Glycerol carbonate is a key multifunctional compound used as solvent, additive, and building block in alternative chlorine-free processes. Here, we report the synthesis of glycerol carbonate from renewable materials (glycerol and dimethyl carbonate, DMC) using basic ionic liquids (ILs) as catalysts. After process optimization, it has been possible to isolate pure glycerol carbonate in quantitative yield using a three-fold excess of DMC and ca. 15 % of IL. The IL could be reused at least four times without any significant reduction in the conversion yield.
E.Sultan Giray, Cinzia Chiappe, Zeynep Tunalı, and Sunita Rajamani
Royal Society of Chemistry (RSC)
We found that in a scCO2-ionic liquid hybrid reaction system, Mannich reaction of benzaldehyde, aniline and acetophenone can be remarkably accelerated and the yield of Mannich base 1,3-diphenyl-3-(phenylamino)propan-1-one was significantly high. This system would be available for the green reactions with good performance.
Cinzia Chiappe and Sunita Rajamani
Wiley
Acidic ionic liquids (ILs) are key systems in synthesis and their performances depend greatly on their cation and anion structure and their liquid-state organization. This microreview reports several examples of Bronsted and/or Lewis acidic ILs that have been selected to highlight the main peculiarities of these systems potentially fundamental for rational design and development of new ionic media and catalysts. Fundamental physico-chemical properties, optimization of which through tailoring of molecular structures could favor more efficient and sustainable applications, are discussed.
Cinzia Chiappe, Christian Silvio Pomelli, and Sunita Rajamani
American Chemical Society (ACS)
The polarity of a series of ionic liquids (ILs) arising from the quaternarization of N-methylmorpholine, N-methylpyrrolidine, N-methylpiperidine, N-methylazepane, 4-hydroxy-1-methylpiperidine, 1,2-dimethylimidazole, and 1-methylimidazole with simple alkyl chains and/or hydroxyl (mono- or dihydroxyl) functionalized alkyl chains and having bistriflimide, dicyanamide, or nitrate as counteranions has been investigated using solvatochromic dyes and expressed in terms of E(T)(N) and Kamlet-Taft parameters (dipolarity/polarizability (π*), hydrogen bond donor acidity (α), and hydrogen bond basicity (β)). Significant variations of polarity were observed on changing the anion and cation combination. The resulting E(T)(N) and α values were strongly anion dependent; on going from bistriflimide to dicyanamide, a significant decrease in E(T)(N) and α values was observed. On the other hand, the alkyl chain length has only a moderate effect on these parameters; either an increase or decrease in E(T)(N) and α values was observed on increasing the alkyl chain length, depending on the cation core. In the case of cyclic onium salts, the size of the cation ring affected the α parameter; the ILs based on the seven-membered ring system N-methyl-N-butylazepanium (also named N-methyl-N-butylhexamethyleneiminium, [HME(1,4)](+)) have high polarity values, comparatively to the ILs based on analogous five- and six-membered cyclic cations (pyrrolidinium and piperidinium). The introduction of the OH groups on the cation alkyl chain increases the polarity; the effect is substantial for the first OH group and more moderate for the second. Also, the thermosolvatochromism (changes in solvatochromic properties with the change in temperature) was studied for four dihydroxyl functionalized ILs. Finally, the principal component analysis (PCA) carried out on 67 ILs has shown that there are only two statistically relevant parameters: PC1, a weighted sum of E(T)(N) and α, which is able to discern between the cation core structure, functionalization, and cation-anion association, and PC2, very close to β, which is related principally to the anion nature.
Carlo Pretti, Monia Renzi, Silvano Ettore Focardi, Andrea Giovani, Gianfranca Monni, Bernardo Melai, Sunita Rajamani, and Cinzia Chiappe
Elsevier BV