• Ligand Dynamics Time Scales Identify the Surface–Ligand Interactions in Thiocyanate-Capped Cadmium Sulfide Nanocrystals 

  Deshmukh, Samadhan; Chatterjee, Srijan; Ghosh, Deborin; Bagchi, Sayan (The Journal of Physical Chemistry Letters, 2022-03-30)

  The nanocrystal surface, which acts as an interface between the semiconductor lattice and the capping ligands, plays a significant role in the attractive photophysical properties of semiconductor nanocrystals for use in a ...
• Predicting the Redox Potentials of Phenazine Derivatives Using DFT-Assisted Machine Learning 

  Ghule, Siddharth; Dash, Soumya Ranjan; Bagchi, Sayan; Joshi, Kavita; Vanka, Kumar (ACS Omega, 2022-03-29)

  This study investigates four machine-learning (ML) models to predict the redox potentials of phenazine derivatives in dimethoxyethane using density functional theory (DFT). A small data set of 151 phenazine derivatives ...
• Association–Dissociation Dynamics of Ionic Electrolytes in Low Dielectric Medium 

  Ghosh, Deborin; Sakpal, Sushil; Chatterjee, Srijan; Deshmukh, Samadhan; Kwon, Hyejin; Kim, Yung Sam; Bagchi, Sayan (The Journal of Physical Chemistry B, 2021-12-27)

  Ionic electrolytes are known to form various complexes which exist in dynamic equilibrium in a low dielectric medium. However, structural characterization of these complexes has always posed a great challenge to the ...
• Transition of a Deep Eutectic Solution to Aqueous Solution: A Dynamical Perspective of the Dissolved Solute 

  Sakpal, Sushil; Deshmukh, Samadhan; Chatterjee, Srijan; Ghosh, Deborin; Bagchi, Sayan (The Journal of Physical Chemistry Letters, 2021-09-07)

  Disruption of the deep eutectic solvent (DES) nanostructure around the dissolved solute upon addition of water is investigated by polarization-selective two-dimensional infrared spectroscopy and molecular dynamics simulations. ...
• Stabilization of Azapeptides by Namide···H–Namide Hydrogen Bonds 

  Baruah, Kalpita; Sahariah, Biswajit; Sakpal, Sushil; Rai Deka, Jugal Kishore; Bar, Arun Kumar; Bagchi, Sayan; Sarma, Bani Kanta (Organic Letters, 2021-06-01)

  An unusual Namide···H–Namide hydrogen bond (HB) was previously proposed to stabilize the azapeptide β-turns. Herein we provide experimental evidence for the Namide···H–Namide HB and show that this HB endows a stabilization ...
• Evidence of an nN(amide) → π*Ar Interaction in N-Alkyl-N,N′-diacylhydrazines 

  Rai Deka, Jugal Kishore; Sahariah, Biswajit; Sakpal, Sushil; Bar, Arun Kumar; Bagchi, Sayan; Sarma, Bani Kanta (Organic Letters, 2021-05-11)

  1,2-Dibenzoyl-1-tert-butylhydrazine (RH-5849) and related N-alkyl-N,N′-diacylhydrazines are environmentally benign insect growth regulators. Herein, we show that an unusual nN(amide) → π*Ar interaction mediated by a hydrazide ...
• The Curious Case of Aqueous Warfarin: Structural Isomers or Distinct Excited States? 

  Sakpal, Sushil; Ghosh, Deborin; Manae, Meghna; Hazra, Anirban; Bagchi, Sayan (The Journal of Physical Chemistry B, 2021-03-17)

  Warfarin is a potent anti-coagulant drug and is on the World Health Organization’s List of Essential Medicines. Additionally, it displays fluorescence enhancement upon binding to human serum albumin, making warfarin a ...
• Electrostatic Manifestation of Micro-Heterogeneous Solvation Structures in Deep-Eutectic Solvents: A Spectroscopic Approach 

  Chatterjee, Srijan; Haldar, Tapas; Ghosh, Deborin; Bagchi, Sayan (The Journal of Physical Chemistry B, 2020-04-10)

  Deep eutectic solvents have emerged as inexpensive green alternatives to conventional solvents for diverse applications in chemistry and biology. Despite their importance as useful media in various applications, little is ...
• Hydrocarbon Chain-Length Dependence of Solvation Dynamics in Alcohol-Based Deep Eutectic Solvents: A Two-Dimensional Infrared Spectroscopic Investigation 

  Chatterjee, Srijan; Ghosh, Deborin; Haldar, Tapas; Deb, Pranab; Sakpal, Sushil; Deshmukh, Samadhan; Kashid, Somnath; Bagchi, Sayan (The Journal of Physical Chemistry B, 2019-10-14)

  Deep eutectic solvents (DESs) have gained popularity in recent years as an environmentally benign, inexpensive alternative to organic solvents for diverse applications in chemistry and biology. Among them, alcohol-based ...
• Arresting an Unusual Amide Tautomer Using Divalent Cations 

  Kashid, Somnath; Singh, Reman; Kwon, Hyejin; Kim, Yung Sam; Mukherjee, Arnab; Bagchi, Sayan (The Journal of Physical Chemistry B, 2019-09-18)

  Ion-specific effects on peptides and proteins are key to biomolecular structure and stability. The subtle roles of the cations are far less understood, compared to the pronounced effects of the anions on proteins. Most ...
• Interconverting Hydrogen-Bonding and Weak n → π* Interactions in Aqueous Solution: A Direct Spectroscopic Evidence 

  Deb, Pranab; Geun, Young Jin; Singh, Santosh; Moon, Juran; Kwon, Hyejin; Das, Aloke; Bagchi, Sayan; Kim, Yung Sam (The Journal of Physical Chemistry Letters, 2018-08-27)

  Molecular structure and function depend on myriad noncovalent interactions. However, the weak and transient nature of noncovalent interactions in solution makes them challenging to study. Information on weak interactions ...
• Two-Dimensional Infrared Spectroscopy Reveals Cosolvent-Composition-Dependent Crossover in Intermolecular Hydrogen-Bond Dynamics 

  Kashid, Somnath; Geun, Young Jin; Chakrabarty, Suman; Kim, Yung Sam; Bag, Sayan (The Journal of Physical Chemistry Letters, 2017-03-22)

  Cosolvents have versatile composition-dependent applications in chemistry and biology. The simultaneous presence of hydrophobic and hydrophilic groups in dimethyl sulfoxide (DMSO), an industrially important amphiphilic ...
• Pick and Choose the Spectroscopic Method to Calibrate the Local Electric Field inside Proteins 

  Haldar, Tapas; Kashid, Somnath; Deb, Pranab; Kesh, Sandeep; Bagchi, Sayan (The Journal of Physical Chemistry Letters, 2016-06-13)

  Electrostatic interactions in proteins play a crucial role in determining the structure–function relation in biomolecules. In recent years, fluorescent probes have been extensively employed to interrogate the polarity in ...
• Electrostatic Interactions Are Key to C═O n-π* Shifts: An Experimental Proof 

  Haldar, Tapas; Bagchi, Sayan (The Journal of Physical Chemistry Letters, 2016-06-01)

  Carbonyl n-π* transitions are known to undergo blue shift in polar and hydrogen-bonding solvents. Using semiempirical expressions, previous studies hypothesized several factors like change in dipole moment and hydrogen-bond ...
• Correlating Nitrile IR Frequencies to Local Electrostatics Quantifies Noncovalent Interactions of Peptides and Proteins 

  Deb, Pranab; Haldar, Tapas; Kashid, Somnath; Banerjee, Subhrashis; Chakrabarty, Suman; Bagchi, Sayan (The Journal of Physical Chemistry B, 2016-04-26)

  Noncovalent interactions, in particular the hydrogen bonds and nonspecific long-range electrostatic interactions are fundamental to biomolecular functions. A molecular understanding of the local electrostatic environment, ...
• Cosolvent Effects on Solute–Solvent Hydrogen-Bond Dynamics: Ultrafast 2D IR Investigations 

  Kashid, Somnath; Jin, Geun Young; Bagchi, Sayan; Kim, Yung Sam (The Journal of Physical Chemistry B, 2015-11-24)

  Cosolvents strongly influence the solute–solvent interactions of biomolecules in aqueous environments and have profound effects on the stability and activity of several proteins and enzymes. Experimental studies have ...
• Experimental Determination of the Electrostatic Nature of Carbonyl Hydrogen-Bonding Interactions Using IR-NMR Correlations 

  Kashid, Somnath; Bagchi, Sayan (The Journal of Physical Chemistry Letters, 2014-09-18)

  Hydrogen-bonding plays a fundamental role in the structure, function, and dynamics of various chemical and biological systems. Understanding the physical nature of interactions and the role of electrostatics in hydrogen-bonding ...
• Impact of water addition on fluctuation dynamics in viscous solvents with varied heterogeneity: A 2D IR spectroscopic study 

  Chowdhury, Tubai; Ghosh, Sucheta; Pathania, Akhil; Kore, Shivshankar; Mon, Akhil B; Chatterjee, Srijan; Deshmukh, Samadhan (Chemical Physics Impact, 2023-10-05)

  The addition of cosolvent, such as water, influences the overall fluctuation dynamics as sensed by the probe. It is crucial to unravel the fluctuation dynamics when water is added, particularly in viscous solvents with ...
• Does Viscosity Drive the Dynamics in an Alcohol-Based Deep Eutectic Solvent? 

  Chatterjee, Srijan; Deshmukh, Samadhan; Bagchi, Sayan (The Journal of Physical Chemistry B, 2022-10-06)

  Deep eutectic solvents, consisting of heterogeneous nanodomains of hydrogen-bonded networks, have evolved into a range of viscous fluids that find applications in several fields. As viscosity is known to influence the ...
• On–Off Infrared Absorption of the S═O Vibrational Probe of Dimethyl Sulfoxide 

  Chakrabarty, Suranjana; Deshmukh, Samadhan; Barman, Anjan; Bagchi, Sayan; Ghosh, Anup (The Journal of Physical Chemistry B, 2022-06-08)

  Dimethyl sulfoxide (DMSO), a polar solvent molecule, is used in a wide range of therapeutic and pharmacological applications. Different intermolecular interactions, such as dimerization and hydrogen bonding with water, are ...

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