Photosensitizers and Applications
Renjith Thomas, T Pooventhiran
Renjith Thomas, Anila Skariah
M.A.A.-H. Badawi, M. Dagher, A.Y.A. Alzahrani, A.A. Khairbek, R. Thomas, Computational studies of the metal-free [3+2] cycloaddition reaction of azide with enaminone for the synthesis of 1,2,3-triazoles, New J. Chem. 49 (2024) 291 – 301. https://doi.org/10.1039/d4nj04341c.
P. Surendar, S.K. Jesudoss, C. Raja, K.J. Rajimon, R. Thomas, T. Pooventhiran, Molecular Interactions Between Hexanal Schiff Bases and Boron Nanocages: A DFT Approach, J. Comput. Biophys. Chem. (2024). https://doi.org/10.1142/S2737416524500169
K.J. Rajimon, A.Y. Alzahrani, E.S. Aazam, B.M. Abbas, P. Govindarajan, R. Thomas, Unveiling the multifaceted potential of (E)-N-(4-Chlorophenyl)-1-(thiophen-2-yl) methanimine with special reference to solution-state fluorescence, synthesis, electronic structure, antimicrobial, antibiofilm, larvicidal activities, toxicity, docking and d, J. Mol. Struct. 1302 (2024). https://doi.org/10.1016/j.molstruc.2023.137428.
A.A. Khairbek, A.Y. Alzahrani, M.A.A.-H. Badawi, R. Thomas, Computational studies on CuAAC reaction mechanism with [CuX (PPh3)]; X= I, Br, Cl for the synthesis of 4-and 5-halo-1, 2, 3-triazoles, React. Kinet. Mech. Catal. 137 (2024) 777–790. https://doi.org/10.1007/s11144-023-02548-z
J.M. Thomas, A.Y. Alzahrani, P. Govindarajan, R. Thomas, Assessing the Noncovalent Interaction of Deucravacitinib and Ethanol with Special Reference to an Independent Gradient Model Based on Hirshfeld Partition, J. Phys. Chem. B. 128 (2024) 10469–10480. https://doi.org/10.1021/acs.jpcb.4c04852
S.A. Sunny, A. Prakash, R. Almeer, R. Thomas, Mapping the Interaction Landscape of Adenosine and Minoxidil Sulfate Using an Independent Gradient Model Based on Hirshfeld Partition and Interaction Region Indicator, J. Phys. Chem. B. 128 (2024) 9847–9858. https://doi.org/10.1021/acs.jpcb.4c05283
M.A.A.-H. Badawi, M.I. Al-Zaben, A. Sotal, A.Y. Alzahrani, A. Khairbek, R. Thomas, Quantum mechanical investigation of the mechanism of Ni(0)-catalyzed cycloaddition reaction of 2-cyclobutanone with alkyne, Zeitschrift Fur Phys. Chemie. 238 (2024) 223–237. https://doi.org/10.1515/zpch-2023-0394
J. Sonia, B.N. Kumara, K.J. Pinto, A. Hashim, E.S.S. Priya, B. Kalpana, R. Thomas, K.S. Prasad, Disposable paper electrodes for detection of changes in dopamine concentrations in rat brain homogenates, Talanta. 274 (2024). https://doi.org/10.1016/j.talanta.2024.125940.
A.A. Khairbek, M.I. Al-Zaben, F. Abbas, M.A.A.-H. Badawi, R. Thomas, Exploring the potential of metal-catalysis with N, N-type ligands in [3+2] cycloaddition reactions of azides and alkynes using theoretical tools, React. Kinet. Mech. Catal. (2024). https://doi.org/10.1007/s11144-024-02696-w.
N. Elangovan, A.Y. Alzahrani, G. Ajithkumar, R.K. J, R. Thomas, Investigation of Molecular Structure, Topological and Molecular Docking Studies of a Novel Anticancer Drug Pacritinib, Polycycl. Aromat. Compd. 44 (2024) 4388 – 4415. https://doi.org/10.1080/10406638.2023.2249575.
S. Mallika, N. Thirughanasambantham, B. Revathi, V. Balachandran, N. Elangovan, N. Arumugam, R. Thomas, Solvation and its influence on the electronic structure and pharmacological activity of 2-fluoro-6-trifluromethyl acetophenone, J. Mol. Liq. 414 (2024). https://doi.org/10.1016/j.molliq.2024.126154.
M. Varghese, J.M. Thomas, A.Y. Alzahrani, R. Thomas, Exploring the dynamics of halogen and hydrogen bonds in halogenated coumarins, Zeitschrift Fur Phys. Chemie. (2024). https://doi.org/10.1515/zpch-2023-0570.
K.J. Rajimon, A.Y. Alzahrani, D.S.R. Nair, D.P. Venkatesh, R. Thomas, Exploring the structure and dynamics of a fluorescent schiff base (1E, 1′ E)-1, 1′-(1, 4-phenylene) bis (N-(4-chlorophenyl) methamine: Synthesis, spectroscopic analysis, thermal, electronic and crystallographic study with biological applications, J. Mol. Struct. 1312 (2024) 138546. https://doi.org/10.1016/j.molstruc.2024.138546
A.B. Abraham, A.Y. Alzahrani, R. Thomas, Exploring non-covalent interactions between caffeine and ascorbic acid: their significance in the physical chemistry of drug efficacy, Zeitschrift Fur Phys. Chemie. 238 (2024) 401–420. https://doi.org/10.1515/zpch-2023-0390
G. Ashok, F. Thomas, R. Thomas, Understanding the hydrogen bonding preferences and dynamics of prontosil in water and methanol, Chem. Phys. Impact. 8 (2024). https://doi.org/10.1016/j.chphi.2023.100453.
N. Elangovan, S. Sowrirajan, A.Y.A. Alzahrani, D.S. Rajendran Nair, R. Thomas, Fluorescent Azomethine by the Condensation of Sulfadiazine and 4-Chlorobenzaldehyde in Solution: Synthesis, Characterization, Solvent Interactions, Electronic Structure, and Biological Activity Prediction, Polycyclic Aromatic Compounds 44 (2024) 2332–2353. https://doi.org/10.1080/10406638.2023.2216833.
T.S. Ganesan, N. Elangovan, A. Sirajunnisa, T. Angel, S. Sowrirajan, S. Chandrasekar, D.S.R. Nair, R. Thomas, Synthesis, quantum mechanical studies, physicochemical properties and molecular docking studies of Schiff base NN-(1, 2-Phenylene) Bis (1-(4-Bromophenyl) Methanimine) from o-phenylenediamine and 4-bromobenzaldehyde, Polycycl. Aromat. Compd. 44 (2024) 1971–1990. https://doi.org/10.1080/10406638.2023.2209260
N. Elangovan, T.S. Ganesan, B. Rajeswari, A. Kanagavalli, S. Kokilavani, S. Sowrirajan, S. Chandrasekar, R. Thomas, Solid-state synthesis, electronic structure studies, solvent interaction through hydrogen bonding, and molecular docking studies of 2, 2’-((1, 2-phenylenebis (azaneylylidene)) bis (methaneylylidene)) diphenol from o-phenylenediamine and salicylaldehyde, Polycycl. Aromat. Compd. 44 (2024) 1495–1519. https://doi.org/10.1080/10406638.2023.2198723
E.S. Aazam, R. Thomas, Solution stage fluorescence and anticancer properties of azomethine compounds from sulpha drugs: Synthesis, experimental and theoretical insights, J. Mol. Struct. 1295 (2024) 136669. https://doi.org/10.1016/j.molstruc.2023.136669
E.S. Aazam, R. Thomas, Synthesis , characterization , and electronic structure of bioactive vanillin based fluorescent Schiff bases, J. Mol. Liq. 395 (2024) 123820. https://doi.org/10.1016/j.molliq.2023.123820.
A Systematic Computational Protocol for Deconstructing Non-Covalent Interactions: BerchNCI 1.0
Non-covalent interactions constitute the fundamental organizing principles of supramolecular assemblies; however, the accurate modeling of these subtle, dispersion-driven forces remains a formidable challenge in theoretical chemistry. In this work, we formally propose the Berchmans Protocol for Modelling Non-Covalent Interactions 1.0 (BerchNCI 1.0), a comprehensive, hierarchical computational workflow designed to decipher the electronic anatomy of NCIs with benchmark precision.
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Electron Upconversion Enables CP and CS Bond Formation Under Mild Oxidative Conditions: A Theoretical Study
Meera's first paper as the part of her PhD thesis published in Journal of Computational Chemistry. The work has been based on some of the finidngs of Prog Igor Alabugin of Florida State University, USA. Traditional methods for forming carbon–phosphorus (C–P) and carbon–sulfur (C–S) bonds often rely on strong oxidants that generate high-energy carbocation intermediates, frequently leading to unwanted side reactions. In this work, we employ DFT to investigate an alternative mechanism operating under basic conditions that utilizes three-electron bond formation and concomitant electron upconversion. Our computational results reveal a radical-anionic pathway initiated by a cyclization to form a 2-center-3-electron (2c-3e) bond, followed by the oxidation of the resulting upconverted radical-anion by mild oxidants such as molecular oxygen . This pathway is shown to be both thermodynamically and kinetically favored over conventional two-electron routes, providing a more controlled and selective strategy for C–P and C–S bond construction. These findings suggest that electron-upconversion mechanisms can significantly advance green chemistry by reducing dependence on harsh reagents and minimizing synthetic side reactions.
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Sneha & Ananya’s paper in Journal of Physical Chemistry B
PhD student Sneha Anna Sunny's paper on the Mapping the Interaction Landscape of Adenosine and Minoxidil Sulfate Using an Independent Gradient Model Based on Hirshfeld Partition and Interaction Region Indicator. Ananya Prakash is a final year MSc Physics student of our college who worked in our lab as part of the Kerala Theoretical Physics Initiative (KTPI) student project initiative,
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Manjesh Mathew: Benchmarking Computational Approaches for Proton Affinity
In this collaborative study with Dr Ralph Puchta, Manjesh Mathew, PhD student assessed the proton affinities and gas phase basicities of molecules ranging from ammonia to proton sponges like PMG using computational methods including B3LYP, BP86, PBEPBE, APFD, wB97XD, and M062X with the def2tzvp basis set. The M062X method showed the highest accuracy, closely matching experimental results for all examples, especially those containing heteroatoms, while APFD and wB97XD tended to overestimate values. Dispersion corrections were evaluated but found not to significantly affect basicity predictions. Computational and Theoretical Chemistry
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Alen Binu Abraham : Non-Covalent Interactions of Caffeine and Ascorbic Acid
In this study, we explored the non-covalent interactions between caffeine and ascorbic acid, focusing on their hydrogen bonding in both gas and solvent (water) phases, using Density Functional Theory. The binding energy calculations revealed significant interactions with values of −14.65 kcal/mol in the gas phase and −11.62 kcal/mol in water. Through Natural Bond Orbital, RDG, AIM, and LED analyses, we confirmed the stabilization energy and electron delocalization in the caffeine-ascorbic acid complex, enhancing our understanding of drug-drug interactions and their implications for drug efficacy and delivery systems. Abraham, Alen Binu, Alzahrani, Abdullah Y. and Thomas, Renjith. "Exploring non-covalent interactions between caffeine and ascorbic acid: their significance in the physical chemistry of drug efficacy" Zeitschrift für Physikalische Chemie, vol. 238, no. 2, 2024, pp. 401-420.
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Gayathri: Hydrogen Bonding and Dynamics of Prontosil in Water and Methanol
In this theoretical study, we investigated the solvation energies of prontosil, a pioneering sulfa drug, in water and methanol using DFT/M06-2X/cc-pVDZ level of theory. Our findings reveal that prontosil shows more favorable interactions with methanol than water, as evidenced by NBO, RDG, QTAIM analyses, and local energy decomposition (LED) analysis using DLPNO-CCSD(T). The prontosil-methanol complex displayed the lowest binding energy and highest stability, suggesting methanol as a more suitable solvent for prontosil in terms of molecular interactions and stability. These insights are further corroborated by ab initio molecular dynamics simulations, underscoring the importance of solvent choice in drug design and molecular interaction studies. Here is the link to "Understanding the hydrogen bonding preferences and dynamics of prontosil in water and methanol":
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Jisha’s paper in Journal of Physical Chemistry-B (ACS)
Postdoc Dr Jisha's latest paper Assessing the Noncovalent Interaction of Deucravacitinib and Ethanol with Special Reference to an Independent Gradient Model Based on Hirshfeld Partition
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Rajimon’s first bioactive chalcone paper in JMS
Rajimons Chalcone paper in collaboration with Prof Sarojini, Mangalore Univeristy
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Metalfree cycloaddition in New Journal of Chemistry
The paper investigates the metal-free [3+2] cycloaddition reaction between phenyl azide and phenyl enaminone to selectively synthesize 1,2,3-triazoles. Using computational methods, it explores the reaction pathways (1,4- and 1,5-pathway), solvent effects, and the impact of phenyl azide substituents, offering insights into the reaction mechanism and the role of water as a solvent and catalyst.
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Rajimon : Schiff base derived from 4-Chloroaniline and 2-Formylphenol
PhD student Rajimon KJ's 6th first-authored paper in Journal of Molecular Structure (Elsevier). Comprehensive assessment of schiff base derived from 4-Chloroaniline and 2-Formylphenol: Molecular architecture, experimental with computational bioactivity profiling, emphasizing anticancer efficacy against pulmonary and mammary carcinoma cell models
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Cu-Schiff base complex in Polyhedron
PhD student Rajimon KJ's 7th first-authored paper was published in Polyhedron (Elsevier). Structural, spectroscopic, and biological properties of an asymmetric Cu (II) Schiff-base complex: Synthesis, DNA/BSA interactions, and antimicrobial potential with experimental and computational insights
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Collaborative paper with Prof BK Sarojini, Mangalaore University
Supramolecular and computational analysis of Fluconazole −2−chloro−5−nitrobenzoic acid cocrystal. PhD student, Rajimon KJ was a visitor at her lab last year.
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