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Jain A, Sivasakthi P, Samanta PK, Chakravarty M. Isomeric Benzenediol-Linked Organophosphonates as a Handy Reusable Emitting Platform: Diversity in Polyamine Vapor Detection. J Org Chem 2024; 89:4384-4394. [PMID: 38488484 DOI: 10.1021/acs.joc.3c02490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
This work introduces metal/column-free facile quantitative access to conformationally twisted catechol-linked organophosphonate (CAP) as a blue-emitting solid that could reversibly detect only 1,3-diaminopropane (DAP) and 1,2-ethylenediamine (EDA) vapors, belonging to industrially and pharmaceutically abundant crucial diamines. In CAP, two adjacent hydroxy groups in a benzene ring facilitate selective diamine-dihydroxy (amine-phenol type) interactions in the solid phase, leading to a quenched emission with selectively smaller aliphatic PAs, that is, DAP and EDA. The disparity was noticed with an isomeric resorcinol-linked emitter (RAP), detecting various polyamine vapors with superior sensitivity. A one-carbon-away placed hydroxy group in RAP can only generate a monoamine-hydroxy complex, not diamine-dihydroxy. The more acidic nature of resorcinol would prefer ionizing the amines and, consequently, creating amine/hydroxy interactions. More systematic investigations reveal an exciting role of amine-hydroxy realization for the catechol analog in the solid phase with a syn-anti conformation for CAP. Unlike CAP, RAP's available crystal void space creates considerable room in which to come closer and facilitates amine-phenol interactions. The role of phosphonates in the selective detection of PAs is also examined. Observed outcomes are substantiated by FT-IR, single-crystal X-ray diffraction, SEM, XPS, and mass spectroscopic studies. The proposed amine-hydroxy interactions are further supported by DFT-optimized molecular structures.
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Affiliation(s)
- Akshita Jain
- Department of Chemistry, Birla Institute of Technology and Sciences-Pilani-Hyderabad Campus, Jawahar Nagar Hyderabad 500078, India
| | - Pandiyan Sivasakthi
- Department of Chemistry, Birla Institute of Technology and Sciences-Pilani-Hyderabad Campus, Jawahar Nagar Hyderabad 500078, India
| | - Pralok K Samanta
- Department of Chemistry, Birla Institute of Technology and Sciences-Pilani-Hyderabad Campus, Jawahar Nagar Hyderabad 500078, India
| | - Manab Chakravarty
- Department of Chemistry, Birla Institute of Technology and Sciences-Pilani-Hyderabad Campus, Jawahar Nagar Hyderabad 500078, India
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Khan S, Chand S, Sivasakthi P, Samanta PK, Chakraborty C. A Highly Robust and Conducting Ultramicroporous 3D Fe(II)-Based Metal-Organic Framework for Efficient Energy Storage. Small 2024:e2401102. [PMID: 38573909 DOI: 10.1002/smll.202401102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 03/21/2024] [Indexed: 04/06/2024]
Abstract
Exploitation of metal-organic framework (MOF) materials as active electrodes for energy storage or conversion is reasonably challenging owing to their poor robustness against various acidic/basic conditions and conventionally low electric conductivity. Keeping this in perspective, herein, a 3D ultramicroporous triazolate Fe-MOF (abbreviated as Fe-MET) is judiciously employed using cheap and commercially available starting materials. Fe-MET possesses ultra-stability against various chemical environments (pH-1 to pH-14 with varied organic solvents) and is highly electrically conductive (σ = 0.19 S m-1) in one fell swoop. By taking advantage of the properties mentioned above, Fe-MET electrodes give prominence to electrochemical capacitor (EC) performance by delivering an astounding gravimetric (304 F g-1) and areal (181 mF cm-2) capacitance at 0.5 A g-1 current density with exceptionally high cycling stability. Implementation of Fe-MET as an exclusive (by not using any conductive additives) EC electrode in solid-state energy storage devices outperforms most of the reported MOF-based EC materials and even surpasses certain porous carbon and graphene materials, showcasing superior capabilities and great promise compared to various other alternatives as energy storage materials.
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Affiliation(s)
- Soumen Khan
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
- Materials Center for Sustainable Energy & Environment (McSEE), Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
| | - Santanu Chand
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Pandiyan Sivasakthi
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
| | - Pralok K Samanta
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
| | - Chanchal Chakraborty
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
- Materials Center for Sustainable Energy & Environment (McSEE), Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Jawaharnagar, Samirpet, Hyderabad, Telangana, 500078, India
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Chakraborty M, Sivasakthi P, Samanta PK, Chakravarty M. Concentration-tuned diverse response to selective biogenic amines using a reusable fluorophore: monitoring protein-rich food spoilage. J Mater Chem B 2024; 12:2746-2760. [PMID: 38379378 DOI: 10.1039/d3tb02569a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Maintaining the freshness of food is essential for a healthy and quality life. Nevertheless, it remains a global challenge. Hence, an easy detection and monitoring protocol would be highly desirable. A cyanoacrylic acid (CAA)-based fluorophore is manifested as a reusable platform that responds diversely against different concentrations of selective aliphatic biogenic amines (BAs) in both solution and vapor phases. Slow spoilage of the protein-rich food is progressively monitored through emission shifts visible to the naked eye. This fluorophore provides easy and naked-eye detection of the BA vapor through a change in emission, i.e., red → orange → orange-yellow → cyan → green and quantum yield enhancement, which occur in stepwise increments of vapor concentrations. The probe design includes π-conjugated functionalized fluorescent molecules linked to multiple twisting sites, resulting in both solid and solution-state emission. The attached carboxylic acid responds quickly with selective BAs, mainly putrescine (PUT), cadaverine (CAD), and spermidine (SPM), where the concentration-based emission variation has appeared to be distinct and prominent against PUT [sensitivity (μM): 2 (solution); 3.3 (vapour)]. The selectivity towards diamine can be clarified by the formation of carboxylic acid salts and the consequent proton exchanges between free and protonated amines. In addition, -CN···H interaction is likely to develop within this ammonium carboxylate system, providing extra stability. Such ammonium carboxylate salt formation and gradual change in the molecular arrangement, resulting in symmetry development, are validated by FT-IR and wide-angle X-ray diffraction studies. Besides, this fact is supported by DFT studies that validate intramolecular H-atom exchange between free amine and ammonium salt units. A fluorophore-coated coverslip, filter paper, or silica gel-coated Al-plate is fruitfully utilized to detect the freshness of fish and chicken, which reveals the potential of this probe to prevent food waste and control food safety.
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Affiliation(s)
- Madhuparna Chakraborty
- Department of Chemistry, Department of Chemistry, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad-500078, India.
| | - Pandiyan Sivasakthi
- Department of Chemistry, Department of Chemistry, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad-500078, India.
| | - Pralok K Samanta
- Department of Chemistry, Department of Chemistry, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad-500078, India.
| | - Manab Chakravarty
- Department of Chemistry, Department of Chemistry, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad-500078, India.
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Meenu PC, Samanta PK, Datta SP, Singh SA, Dinda S, Chakraborty C, Roy S. Correction to "Electro-oxidation Reaction of Methanol over La 2-xSr xNi 1-y(Mn/Fe/Co) yO 4+δ Ruddlesden-Popper Oxides". Inorg Chem 2024; 63:2312. [PMID: 38216510 DOI: 10.1021/acs.inorgchem.4c00012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
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Meenu PC, Samanta PK, Datta SP, Singh SA, Dinda S, Chakraborty C, Roy S. Electro-Oxidation Reaction of Methanol over La 2-xSr xNi 1-y(Mn/Fe/Co) yO 4+δ Ruddlesden-Popper Oxides. Inorg Chem 2024; 63:526-536. [PMID: 38109558 DOI: 10.1021/acs.inorgchem.3c03429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Solution combustion-synthesized Ruddlesden-Popper oxides La1.4Sr0.6Ni0.9(Mn/Fe/Co)0.1O4+δ were explored for the methanol electro-oxidation reaction. With optimal doping of Sr2+ in the A site and Co2+ in the B site, Ni3+ with t2g6 d x 2 - y 2 1 configuration in La1.4Sr0.6Ni0.9Co0.1O4+δ exhibited a tetragonal distortion with compression in axial bonds and elongation in equatorial bonds. This structural modification fostered an augmented overlap of d z 2 orbitals with axial O 2p orbitals, leading to a heightened density of states at the Fermi level. Consequently, this facilitated not only elevated electrical conductivity but also a noteworthy reduction in the charge transfer resistance. These effects collectively contributed to the exceptional methanol oxidation activity of La1.4Sr0.6Ni0.9Co0.1O4+δ, as evidenced by an impressive current density of 21.4 mA cm-2 and retention of 95% of initial current density even after 10 h of prolonged reaction. The presence of Ni3+ further played a pivotal role in the creation of NiOOH, a crucial intermediate species, facilitated by the presence of surface oxygen vacancies. These factors synergistically enabled efficient methanol oxidation. In summary, our present study not only yields substantial insights but also paves the way for a novel avenue to fine-tune the activity of Ruddlesden-Popper oxides for the successful electro-oxidation of methanol.
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Affiliation(s)
- Preetha Chandrasekharan Meenu
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Pralok K Samanta
- Department of Chemistry, School of Science, GITAM University, Hyderabad 502329, India
| | - Santanu Prasad Datta
- Department of Mechanical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Satyapaul A Singh
- Department of Chemical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Srikanta Dinda
- Department of Chemical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Chanchal Chakraborty
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Sounak Roy
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
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Sivasakthi P, Samanta PK. Exploring Thioxanthone Derivatives as Singlet Oxygen Photosensitizers for Photodynamic Therapy at the Near-IR Region. J Phys Chem A 2023; 127:8900-8910. [PMID: 37819527 DOI: 10.1021/acs.jpca.3c05780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
In the lowest excited triplet state, the excited photosensitizer reacts with tissue oxygen and forms reactive oxygen species (ROS), which kills tissue cells in photodynamic therapy (PDT). Metal-free thio-based pure organic molecules and analogous nucleobases can be used as photosensitizers for PDT applications. Using quantum chemical methods, we studied one- and two-photon optical absorptions, fluorescence, and other excited-state properties of substituted thioxanthone derivatives for their potential as photosensitizers for PDT. Our calculated values were compared with the available experimental data. The calculation of the intersystem crossing rate constant for these photosensitizers explains the high quantum yield of the formation of ROS, as reported experimentally. The excited triplet-state population of the photosensitizer occurs through the 1π-π* → 3n-π* channel of intersystem crossing and increases in the presence of halogen substitution.
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Affiliation(s)
- Pandiyan Sivasakthi
- Department of Chemistry, School of Science, Gandhi Institute of Technology and Management (GITAM), Hyderabad 502329, India
| | - Pralok K Samanta
- Department of Chemistry, School of Science, Gandhi Institute of Technology and Management (GITAM), Hyderabad 502329, India
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Halder S, Pal S, Sivasakthi P, Samanta PK, Chakraborty C. Thiazolothiazole-Containing Conjugated Polymer with Electrochromism and Electrofluorochromism-Based Dual Performance for a Flip-Flop Molecular Logic Gate. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c01767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Sivasakthi P, Jacob JM, Ravva MK, Samanta PK. Theoretical Insights into the Optical and Excited State Properties of Donor-Phenyl Bridge-Acceptor Containing Through-Space Charge Transfer Molecules. J Phys Chem A 2023; 127:886-893. [PMID: 36653147 DOI: 10.1021/acs.jpca.2c07055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A comparative new strategy to enhance thermally activated delayed fluorescence (TADF) of through-space charge transfer (CT) molecules in organic light-emitting diodes (OLEDs) is investigated. Generally, TADF molecules adopt a twisted donor and acceptor structure to get a sufficiently small ΔEST and a higher value of the spin-orbit coupling matrix element (SOCME). However, molecules containing donor-phenyl bridge-acceptor (D-p-A) units and featuring π-stacked architectures have intramolecular CT contribution through space and exhibit high TADF efficiency. We have explored the insights into the TADF mechanism in D-p-A molecules using the density functional theory (DFT) and time-dependent DFT methods. The calculated optical absorption and ΔEST values are found to be in good agreement with available experimental data. Interestingly, we found the origin of the SOCME to be the twisted orientation of the donor and bridge moieties. Also, we predicted similar molecules with enhanced OLED efficiency with different substitutions.
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Affiliation(s)
- Pandiyan Sivasakthi
- Department of Chemistry, School of Science, GITAM University, Hyderabad502329, India
| | - Jesni M Jacob
- Department of Chemistry, SRM University-AP, Amaravati522240, Andhra Pradesh, India
| | - Mahesh Kumar Ravva
- Department of Chemistry, SRM University-AP, Amaravati522240, Andhra Pradesh, India
| | - Pralok K Samanta
- Department of Chemistry, School of Science, GITAM University, Hyderabad502329, India
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Badavath VN, Kumar A, Samanta PK, Maji S, Das A, Blum G, Jha A, Sen A. Determination of potential inhibitors based on isatin derivatives against SARS-CoV-2 main protease (m pro): a molecular docking, molecular dynamics and structure-activity relationship studies. J Biomol Struct Dyn 2022; 40:3110-3128. [PMID: 33200681 PMCID: PMC7682386 DOI: 10.1080/07391102.2020.1845800] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 10/29/2020] [Indexed: 12/27/2022]
Abstract
SARS-COV-2, the novel coronavirus and root of global pandemic COVID-19 caused a severe health threat throughout the world. Lack of specific treatments raised an effort to find potential inhibitors for the viral proteins. The recently invented crystal structure of SARS-CoV-2 main protease (Mpro) and its key role in viral replication; non-resemblance to any human protease makes it a perfect target for inhibitor research. This article reports a computer-aided drug design (CADD) approach for the screening of 118 compounds with 16 distinct heterocyclic moieties in comparison with 5 natural products and 7 repurposed drugs. Molecular docking analysis against Mpro protein were performed finding isatin linked with a oxidiazoles (A2 and A4) derivatives to have the best docking scores of -11.22 kcal/mol and -11.15 kcal/mol respectively. Structure-activity relationship studies showed a good comparison with a known active Mpro inhibitor and repurposed drug ebselen with an IC50 value of -0.67 μM. Molecular Dynamics (MD) simulations for 50 ns were performed for A2 and A4 supporting the stability of the two compounds within the binding pocket, largely at the S1, S2 and S4 domains with high binding energy suggesting their suitability as potential inhibitors of Mpro for SARS-CoV-2.
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Affiliation(s)
| | - Akhil Kumar
- Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Pralok K. Samanta
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Siddhartha Maji
- Department of Pharmaceutical Sciences and Technology, Birla Institute of Technology, Mesra, Ranchi, India
| | - Anik Das
- Department of Chemistry, Institute of Science, GITAM (Deemed to be University), Visakhapatnam, India
| | - Galia Blum
- Institute for Drug Research, The Hebrew University, Jerusalem, Israel
| | - Anjali Jha
- Department of Chemistry, Institute of Science, GITAM (Deemed to be University), Visakhapatnam, India
| | - Anik Sen
- Department of Chemistry, Institute of Science, GITAM (Deemed to be University), Visakhapatnam, India
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Busschaert N, Maity D, Samanta PK, English NJ, Hamilton AD. Improving structural stability and anticoagulant activity of a thrombin binding aptamer by aromatic modifications. Chembiochem 2022; 23:e202100670. [PMID: 34985829 DOI: 10.1002/cbic.202100670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/04/2022] [Indexed: 11/07/2022]
Abstract
The thrombin binding aptamer (TBA) is a 15-mer DNA oligonucleotide (5'-GGTTGGTGTGGTTGG-3'), that can form a stable intramolecular antiparallel chair-like G-quadruplex structure. This aptamer shows anticoagulant properties by interacting with one of the two anion binding sites of thrombin, namely the fibrinogen-recognition exosite. Here, we demonstrate that terminal modification of TBA with aromatic fragments such as coumarin, pyrene and perylene diimide (PDI), improves the G-quadruplex stability. The large aromatic surface of these dyes can π-π stack to the G-quadruplex or to each other, thereby stabilizing the aptamer. With respect to the original TBA, monoPDI-functionalized TBA exhibited the most remarkable improvement in melting temperature (ΔT m ≈ +18 °C) and displayed enhanced anticoagulant activity.
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Affiliation(s)
- Nathalie Busschaert
- Tulane University, Department of Chemistry, 6400 Freret St, 70118, New Orleans, UNITED STATES
| | | | - Pralok K Samanta
- University College Dublin, School of Chemical and Bioprocess engineering, IRELAND
| | - Niall J English
- University College Dublin, School of chemical and Bioprocess engineering, IRELAND
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Prusti B, Samanta PK, English NJ, Chakravarty M. A C3-symmetric twisted organic salt as an efficient mechano-/thermo-responsive molecule: a reusable and sensitive fluorescent thermometer. Chem Commun (Camb) 2021; 57:12321-12324. [PMID: 34735556 DOI: 10.1039/d1cc05599b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
C 3-Symmetric triaminoguanidinium chloride is condensed with N-pentylphenothiazine carboxaldehyde to realise a thermally stable twisted organic salt on a gram scale. It appears as a nonmetallic economic salt having an integrated propeller shape with three tub-like cores and displays efficient reversible mechano- and thermo-fluorochromic behaviour. Unlike previous reports, the designed fluorescent, colorimetric thermometer works over a higher temperature range of 130-170 °C with five distinct colour variations.
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Affiliation(s)
- Banchhanidhi Prusti
- Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Jawahar Nagar, Shamirpet, Hyderabad, Telangana, 500078, India.
| | - Pralok K Samanta
- Department of Chemistry, School of Science, Gandhi Institute of Technology and Management (GITAM), Hyderabad 502329, India
| | - Niall J English
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin 4, Ireland
| | - Manab Chakravarty
- Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Jawahar Nagar, Shamirpet, Hyderabad, Telangana, 500078, India.
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Ghosh S, Ramarao TA, Samanta PK, Jha A, Satpati P, Sen A. Triazole based isatin derivatives as potential inhibitor of key cancer promoting kinases- insight from electronic structure, docking and molecular dynamics simulations. J Mol Graph Model 2021; 107:107944. [PMID: 34091175 DOI: 10.1016/j.jmgm.2021.107944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 04/07/2021] [Accepted: 05/11/2021] [Indexed: 01/22/2023]
Abstract
Computer Aided Drug Design approaches have been applied to predict potential inhibitors for two different kinases, namely, cyclin-dependent kinase 2 (CDK2) and Epidermal Growth Factor Receptor (EGFR) which are known to play crucial role in cancer growth. We have designed alkyl and aryl substituted isatin-triazole ligands and performed molecular docking to rank and predict possible binding pockets in CDK2 and EGFR kinases. Best-scoring ligands in the kinase-binding pocket were selected from the docking study and subjected to molecular dynamics simulation. Absolute binding affinities were estimated from the MD trajectories using the MM/PBSA approach. The results suggest that aryl substituted isatin-triazole ligands are better binder to the kinases relative to its alkyl analogue. Furthermore, aryl substituted isatin-triazole ligands prefer binding to EGFR kinases relative to CDK2. The ligand binding pockets of the kinases are primarily hydrophobic in nature. Ligand-kinase binding is favoured by electrostatic and Van der Waals interactions, later being the major contributor. Large estimated negative binding affinities (~ -10 to -25 kcal/mol) indicate that the ligands might inhibit the kinases. Physicochemical property analysis suggests that the proposed ligands could be orally bio-available.
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Affiliation(s)
- Suvankar Ghosh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - T Atchuta Ramarao
- Department of Chemistry, GIS, GITAM Deemed to Be University, Rushikonda, Visakhapatnam, 530045, AP, India
| | - Pralok K Samanta
- Department of Chemistry, GSS, GITAM Deemed to Be University, Rudaram, Hyderabad, 502329, Telangana, India
| | - Anjali Jha
- Department of Chemistry, GIS, GITAM Deemed to Be University, Rushikonda, Visakhapatnam, 530045, AP, India.
| | - Priyadarshi Satpati
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
| | - Anik Sen
- Department of Chemistry, GIS, GITAM Deemed to Be University, Rushikonda, Visakhapatnam, 530045, AP, India.
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Kuila S, Ghorai A, Samanta PK, Siram RBK, Pati SK, Narayan KS, George SJ. Red-Emitting Delayed Fluorescence and Room Temperature Phosphorescence from Core-Substituted Naphthalene Diimides. Chemistry 2019; 25:16007-16011. [PMID: 31617260 DOI: 10.1002/chem.201904651] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Indexed: 01/24/2023]
Abstract
Unprecedented ambient triplet-mediated emission in core-substituted naphthalene diimide (cNDI) derivatives is unveiled via delayed fluorescence and room temperature phosphorescence. Carbazole core-substituted cNDIs, with a donor-acceptor design, showed deep-red triplet emission in solution processable films with high quantum yield. This study, with detailed theoretical calculations and time-resolved emission experiments, enables new design insights into the triplet harvesting of cNDIs; an important family of molecules which has been, otherwise, extensively been investigated for its n-type electronic character and tunable singlet fluorescence.
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Affiliation(s)
- Suman Kuila
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Anaranya Ghorai
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Pralok K Samanta
- Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Raja B K Siram
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Swapan K Pati
- Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - K S Narayan
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Subi J George
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
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Samanta PK, English NJ. Opto-electronic properties of stable blue photosensitisers on a TiO2 anatase-101 surface for efficient dye-sensitised solar cells. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136624] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Samanta PK, Alam MM, Misra R, Pati SK. Tuning of hyperpolarizability, and one- and two-photon absorption of donor-acceptor and donor-acceptor-acceptor-type intramolecular charge transfer-based sensors. Phys Chem Chem Phys 2019; 21:17343-17355. [PMID: 31355378 DOI: 10.1039/c9cp03772a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The present work aims to study the effect of solvent as well as arrangement of donor-acceptor groups on linear and non-linear optical (NLO) response properties of two experimentally studied intramolecular charge-transfer (ICT)-based fluorescent sensors. One of them (molecule 1) is a donor-acceptor (D-A) system with hemicyanine and dimethylanilino as electron withdrawing and donating groups, respectively, while the other one (molecule 3) is molecule 1 fused with a boron-dipyrromethene (BODIPY) moiety. BODIPY acts as the electron acceptor group of molecule 2 that as well consists of dimethylanilino as the electron donor. Density functional theory (DFT) as well as time-dependent DFT has been employed to optimize the geometry of the molecules, followed by computation of dipole moment (μ), static first hyperpolarizability (βtotal), and one- and two-photon absorption (TPA) strengths. The results reveal that dipole moment as well as total static first hyperpolarizability (βtotal) of the studied molecules is dominated by the respective components in the direction of charge transfer. The ratio of vector component of first hyperpolarizability (βvec) to βtotal also supports the unidirectional charge transfer in the studied systems. In molecule 3, which is a donor-acceptor-acceptor (D-A-A)-type system, the BODIPY moiety is found to play a major role in controlling the NLO response over the other acceptor group. Solvents are also found to play an important role in controlling the linear as well as NLO response of the studied systems. A significant increase in the first hyperpolarizability as well as TPA cross-section of the studied molecules is predicted due to an increase in the dielectric constant of the medium. The results presented are expected to provide a clue in tuning the NLO response of many ICT-based chromophores, especially those with D-A-A arrangements.
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Affiliation(s)
- Pralok K Samanta
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bengaluru 560064, India.
| | - Md Mehboob Alam
- Department of Chemistry, Indian Institute of Technology Bhilai, Chattisgarh 492015, India
| | - Ramprasad Misra
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.
| | - Swapan K Pati
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bengaluru 560064, India. and New Chemistry Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bengaluru 560064, India
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16
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Acharyya P, Pal P, Samanta PK, Sarkar A, Pati SK, Biswas K. Single pot synthesis of indirect band gap 2D CsPb 2Br 5 nanosheets from direct band gap 3D CsPbBr 3 nanocrystals and the origin of their luminescence properties. Nanoscale 2019; 11:4001-4007. [PMID: 30768107 DOI: 10.1039/c8nr09349k] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Two-dimensional (2D) perovskites recently attracted significant interest due to their unique and novel optoelectronic properties. CsPb2Br5, a 2D inorganic perovskite halide, is an indirect band gap semiconductor, and hence it is not supposed to be luminescent. However, a fundamental understanding of the origin of its luminescence properties is still lacking as there are contradictory literature reports present concerning its luminescence properties. Here, we demonstrate a single pot solution based transformation of 2D CsPb2Br5 nanosheets from the nanocrystals of 3D CsPbBr3 and investigate the origin of its luminescence properties by detailed experiments and density functional theory (DFT) calculations. The photoluminescence of CsPb2Br5 originates from the different amorphous lead bromide ammonium complexes which are present at the surface of the nanosheets. We have also highlighted the formation mechanism of 2D nanosheets from 3D CsPbBr3 nanocrystals. These combined theoretical and experimental studies offer significant insights into the optical properties and formation mechanism of 2D CsPb2Br5 perovskites.
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Affiliation(s)
- Paribesh Acharyya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore 560064, India.
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Kuila S, Rao KV, Garain S, Samanta PK, Das S, Pati SK, Eswaramoorthy M, George SJ. Aqueous Phase Phosphorescence: Ambient Triplet Harvesting of Purely Organic Phosphors via Supramolecular Scaffolding. Angew Chem Int Ed Engl 2018; 57:17115-17119. [PMID: 30376209 DOI: 10.1002/anie.201810823] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Indexed: 11/11/2022]
Abstract
Ambient solution and amorphous state room temperature phosphorescence (RTP) from purely organic chromophores is rarely achieved. Remarkable stabilization of triplet excitons is realized to obtain deep red phosphorescence in water and in amorphous film state under ambient conditions by a unique supramolecular hybrid assembly between inorganic laponite clay and heavy atom core substituted naphthalene diimide (NDI) phosphor. Structural rigidity and oxygen tolerance of the inorganic template along with controlled molecular organization via supramolecular scaffolding are envisaged to alleviate the unprecedented aqueous phase phosphorescence.
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Affiliation(s)
- Suman Kuila
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
| | - K Venkata Rao
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
| | - Swadhin Garain
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
| | - Pralok K Samanta
- Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), India
| | - Shubhajit Das
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.,Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), India
| | - Swapan K Pati
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.,Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), India
| | - Muthusamy Eswaramoorthy
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.,Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), India
| | - Subi J George
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
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Kuila S, Rao KV, Garain S, Samanta PK, Das S, Pati SK, Eswaramoorthy M, George SJ. Aqueous Phase Phosphorescence: Ambient Triplet Harvesting of Purely Organic Phosphors via Supramolecular Scaffolding. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810823] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Suman Kuila
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - K. Venkata Rao
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Swadhin Garain
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Pralok K. Samanta
- Theoretical Science Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) India
| | - Shubhajit Das
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
- Theoretical Science Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) India
| | - Swapan K. Pati
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
- Theoretical Science Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) India
| | - Muthusamy Eswaramoorthy
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
- Chemistry and Physics of Materials Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) India
| | - Subi J. George
- New Chemistry Unit and School of Advanced Materials (SAMat) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
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Haldar R, Diring S, Samanta PK, Muth M, Clancy W, Mazel A, Schlabach S, Kirschhöfer F, Brenner-Weiß G, Pati SK, Odobel F, Wöll C. Verbesserung der Selektivität und Kinetik bei der photooxidativen Zyklisierung mittels supramolekularer Kontrolle. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806996] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ritesh Haldar
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Stéphane Diring
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 Frankreich
| | - Pralok K. Samanta
- Jawaharlal Nehru Centre for Advanced Scientific Research; Theoretical Science Unit (TSU); Bangalore- 560064 Indien
| | - Marius Muth
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - William Clancy
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Antoine Mazel
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 Frankreich
| | - Sabine Schlabach
- Karlsruher Institut für Technologie (KIT); Institut für Angewandte Materialien (IAM); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Frank Kirschhöfer
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Gerald Brenner-Weiß
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Swapan K. Pati
- Jawaharlal Nehru Centre for Advanced Scientific Research; Theoretical Science Unit (TSU); Bangalore- 560064 Indien
| | - Fabrice Odobel
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 Frankreich
| | - Christof Wöll
- Karlsruher Institut für Technologie (KIT); Institut für Funktionale Grenzflächen (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Deutschland
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Haldar R, Diring S, Samanta PK, Muth M, Clancy W, Mazel A, Schlabach S, Kirschhöfer F, Brenner-Weiß G, Pati SK, Odobel F, Wöll C. Enhancing Selectivity and Kinetics in Oxidative Photocyclization by Supramolecular Control. Angew Chem Int Ed Engl 2018; 57:13662-13665. [DOI: 10.1002/anie.201806996] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Ritesh Haldar
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - Stéphane Diring
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 France
| | - Pralok K. Samanta
- Jawaharlal Nehru Centre for Advanced Scientific Research; Theoretical Science Unit (TSU); Bangalore- 560064 India
| | - Marius Muth
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - William Clancy
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - Antoine Mazel
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 France
| | - Sabine Schlabach
- Karlsruhe Institute of Technology (KIT); Institute for Applied Materials (IAM); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - Frank Kirschhöfer
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - Gerald Brenner-Weiß
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
| | - Swapan K. Pati
- Jawaharlal Nehru Centre for Advanced Scientific Research; Theoretical Science Unit (TSU); Bangalore- 560064 India
| | - Fabrice Odobel
- Université Lunam, Université de Nantes; CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230; 2 rue de la Houssinière 44322 Nantes cedex 3 France
| | - Christof Wöll
- Karlsruhe Institute of Technology (KIT); Institute of Functional Interfaces (IFG); Hermann-von-Helmholtz Platz-1 76344 Eggenstein-Leopoldshafen Germany
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21
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Samanta PK, Pati SK. Theoretical insights into the excited-state properties of room-temperature phosphorescence-emitting N-substituted naphthalimides. J Mol Model 2018; 24:246. [PMID: 30128608 DOI: 10.1007/s00894-018-3779-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 08/01/2018] [Indexed: 10/28/2022]
Abstract
The optical absorption, fluorescence, and phosphorescence properties along with the intersystem crossing (ISC) rate constants of a series of N-substituted naphthalimides (NNIs), which can be used as organic emitters, were calculated using density functional theory (DFT) and time-dependent DFT (TDDFT). The calculated absorption, fluorescence, and phosphorescence energies as well as the fluorescence and ISC rate constants were found to be in good agreement with available experimental data. According to the calculations, the first excited singlet and first excited triplet states are π-π* in nature, and 1π-π* → 3n-π* is the dominant ISC channel for 1,8-naphthalimide (NI) and N-methyl-1,8-naphthalimide (Me-NI). Intermolecular charge-transfer (CT) states are observed in the energy region between the 1π-π* and 3π-π* states for NNIs with an electron-donating group. The presence of these CT states leads to a reduction in the S1-state and T1-state energy splitting in NNIs with an electron-donating group compared to the energy splitting observed in NI and Me-NI. The singlet CT state (1CT) has very weak emission oscillator strength, so it is nonemissive. For NNIs with an electron-donating group, the 1CT → 3π-π* transition was found to be the dominant ISC channel. Our results indicate that for NNIs with an electron-donating group, the nonemissive S1 state (1CT) transits to the T1 state (3π-π*) via ISC. The 1CT → 3π-π* transition increases the population of the T1 state and thus the phosphorescence quantum yield at room temperature, even in the absence of a heavy atom. Graphical Abstract The S1 state (1CT), which is nonemissive, transits to the T1 state (3π-π*) via intersystem crossing and increases the population of the T1 state in N-substituted naphthalimides with an electron-donating group.
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Affiliation(s)
- Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore, 560064, India.
| | - Swapan K Pati
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore, 560064, India. .,New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore, 560064, India.
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Samanta PK, Kim D, Coropceanu V, Brédas JL. Up-Conversion Intersystem Crossing Rates in Organic Emitters for Thermally Activated Delayed Fluorescence: Impact of the Nature of Singlet vs Triplet Excited States. J Am Chem Soc 2017; 139:4042-4051. [DOI: 10.1021/jacs.6b12124] [Citation(s) in RCA: 474] [Impact Index Per Article: 67.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Pralok K. Samanta
- Laboratory
for Computational and Theoretical Chemistry of Advanced Materials,
Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Dongwook Kim
- Laboratory
for Computational and Theoretical Chemistry of Advanced Materials,
Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
- Department
of Chemistry, Kyonggi University, 154-42 Gwanggyosan-Ro, Yeongtong-Gu, Suwon 440-760, Korea
| | - Veaceslav Coropceanu
- School
of Chemistry and Biochemistry, Center for Organic Photonics and Electronics
(COPE), Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Jean-Luc Brédas
- Laboratory
for Computational and Theoretical Chemistry of Advanced Materials,
Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
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Abstract
We use ab initio Density Functional Theory (DFT) and Time-dependent DFT (TDDFT) calculations for a detailed understanding of one-photon absorption (1PA) and two-photon absorption (2PA) cross sections of eight different nucleoside analogs. The results are compared and contrasted with the available experimental data. Our calculated results show that the low energy peaks in the absorption spectra mainly arise because of the π-π* electronic transition of the nucleoside analogs. The emission spectra of the nucleoside analogs are also calculated using TDDFT methods. The calculated absorption and emission spectra in the presence of a solvent follow the same trend as those found experimentally. Our results demonstrate that the nucleoside analogs show significantly different electronic and optical properties, although their bonding aspects towards Watson-Crick base pairing remain the same. We also derive the microscopic details of the origin of nonlinear optical properties of the nucleoside analogs.
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Affiliation(s)
- Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
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Narayanaswamy N, Das S, Samanta PK, Banu K, Sharma GP, Mondal N, Dhar SK, Pati SK, Govindaraju T. Sequence-specific recognition of DNA minor groove by an NIR-fluorescence switch-on probe and its potential applications. Nucleic Acids Res 2015; 43:8651-63. [PMID: 26350219 PMCID: PMC4605319 DOI: 10.1093/nar/gkv875] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 08/19/2015] [Indexed: 11/30/2022] Open
Abstract
In molecular biology, understanding the functional and structural aspects of DNA requires sequence-specific DNA binding probes. Especially, sequence-specific fluorescence probes offer the advantage of real-time monitoring of the conformational and structural reorganization of DNA in living cells. Herein, we designed a new class of D2A (one-donor-two-acceptor) near-infrared (NIR) fluorescence switch-on probe named quinone cyanine–dithiazole (QCy–DT) based on the distinctive internal charge transfer (ICT) process for minor groove recognition of AT-rich DNA. Interestingly, QCy–DT exhibited strong NIR-fluorescence enhancement in the presence of AT-rich DNA compared to GC-rich and single-stranded DNAs. We show sequence-specific minor groove recognition of QCy–DT for DNA containing 5′-AATT-3′ sequence over other variable (A/T)4 sequences and local nucleobase variation study around the 5′-X(AATT)Y-3′ recognition sequence revealed that X = A and Y = T are the most preferable nucleobases. The live cell imaging studies confirmed mammalian cell permeability, low-toxicity and selective staining capacity of nuclear DNA without requiring RNase treatment. Further, Plasmodium falciparum with an AT-rich genome showed specific uptake with a reasonably low IC50 value (<4 µM). The ease of synthesis, large Stokes shift, sequence-specific DNA minor groove recognition with switch-on NIR-fluorescence, photostability and parasite staining with low IC50 make QCy–DT a potential and commercially viable DNA probe.
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Affiliation(s)
- Nagarjun Narayanaswamy
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, India
| | - Shubhajit Das
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Khadija Banu
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | | | - Neelima Mondal
- School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Suman K Dhar
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | - Swapan K Pati
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - T Govindaraju
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, India
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Das S, Samanta PK, Pati SK. Watson–Crick base pairing, electronic and photophysical properties of triazole modified adenine analogues: a computational study. NEW J CHEM 2015. [DOI: 10.1039/c5nj01566a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Triazole adenine nucleobase analogues show fluorescence in the UV-Vis region and form Watson–Crick base pairing with thymine nucleobases.
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Affiliation(s)
- Shubhajit Das
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
| | - Pralok K Samanta
- Theoretical Sciences Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
| | - Swapan K Pati
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
- Theoretical Sciences Unit
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26
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Narayanaswamy N, Kumar M, Das S, Sharma R, Samanta PK, Pati SK, Dhar SK, Kundu TK, Govindaraju T. A thiazole coumarin (TC) turn-on fluorescence probe for AT-base pair detection and multipurpose applications in different biological systems. Sci Rep 2014; 4:6476. [PMID: 25252596 PMCID: PMC4174567 DOI: 10.1038/srep06476] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 08/27/2014] [Indexed: 11/09/2022] Open
Abstract
Sequence-specific recognition of DNA by small turn-on fluorescence probes is a promising tool for bioimaging, bioanalytical and biomedical applications. Here, the authors report a novel cell-permeable and red fluorescent hemicyanine-based thiazole coumarin (TC) probe for DNA recognition, nuclear staining and cell cycle analysis. TC exhibited strong fluorescence enhancement in the presence of DNA containing AT-base pairs, but did not fluoresce with GC sequences, single-stranded DNA, RNA and proteins. The fluorescence staining of HeLa S3 and HEK 293 cells by TC followed by DNase and RNase digestion studies depicted the selective staining of DNA in the nucleus over the cytoplasmic region. Fluorescence-activated cell sorting (FACS) analysis by flow cytometry demonstrated the potential application of TC in cell cycle analysis in HEK 293 cells. Metaphase chromosome and malaria parasite DNA imaging studies further confirmed the in vivo diagnostic and therapeutic applications of probe TC. Probe TC may find multiple applications in fluorescence spectroscopy, diagnostics, bioimaging and molecular and cell biology.
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Affiliation(s)
- Nagarjun Narayanaswamy
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, Karnataka, India
| | - Manoj Kumar
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, Karnataka, India
| | - Sadhan Das
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, Karnataka, India
| | - Rahul Sharma
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | - Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064, India
| | - Swapan K Pati
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064, India
| | - Suman K Dhar
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | - Tapas K Kundu
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, Karnataka, India
| | - T Govindaraju
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, Karnataka, India
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Maity D, Raj A, Samanta PK, Karthigeyan D, Kundu TK, Pati SK, Govindaraju T. A probe for ratiometric near-infrared fluorescence and colorimetric hydrogen sulfide detection and imaging in live cells. RSC Adv 2014. [DOI: 10.1039/c4ra00401a] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A ratiometric, near-infrared (NIR), fluorescence and colorimetric probeDNPOCyfor hydrogen sulfide (H2S) has been developed.
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Affiliation(s)
- Debabrata Maity
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - Anand Raj
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - Pralok K. Samanta
- Theoretical Sciences Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - D. Karthigeyan
- Molecular Biology and Genetics Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - Tapas K. Kundu
- Molecular Biology and Genetics Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - Swapan K. Pati
- Theoretical Sciences Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
| | - T. Govindaraju
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560064, India
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Samanta PK, Pati SK. Structural and magnetic properties of a variety of transition metal incorporated DNA double helices. Chemistry 2013; 20:1760-4. [PMID: 24382746 DOI: 10.1002/chem.201302628] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 10/30/2013] [Indexed: 12/22/2022]
Abstract
By using density functional theory calculations, the structural, energetic, magnetic, and optical properties for a variety of transition metal (M = Mn, Fe, Co, Ni and Cu) ions incorporated modified-DNA (M-DNA) double helices has been investigated. The DNA is modified with either hydroxypyridone (H) or bis(salicylaldehyde)ethylenediamine (S-en) metalated bases. We find the formation of extended M-O network leading to the ferromagnetic interactions for the case of H-DNA for all the metal ions. More ordered stacking arrangement was found for S-en-DNA. We calculate the exchange coupling constant (J) considering Heisenberg Hamiltonian for quantitative description of magnetic interactions. The ferromagnetic and antiferromagnetic interactions are obtained by varying different transition metal ions. The extent of the magnetic interaction depends on the number of transition metal ions. Optical profiles show peaks below 2 eV, a clear signature of spin-spin coupling.
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Affiliation(s)
- Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064 (India), Fax: (+91) 80-2208-2766/2767, Hompage: http://www.jncasr.ac.in/pati
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Avinash MB, Samanta PK, Sandeepa KV, Pati SK, Govindaraju T. Molecular Architectonics of Stereochemically Constrained π-Complementary Functional Modules. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300677] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Neihsial S, Periyasamy G, Samanta PK, Pati SK. Understanding the Binding Mechanism of Various Chiral SWCNTs and ssDNA: A Computational Study. J Phys Chem B 2012. [DOI: 10.1021/jp305894c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Siamkhanthang Neihsial
- Theoretical
Sciences Unit and ‡New Chemistry Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore
560064, India
| | - Ganga Periyasamy
- Theoretical
Sciences Unit and ‡New Chemistry Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore
560064, India
| | - Pralok K. Samanta
- Theoretical
Sciences Unit and ‡New Chemistry Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore
560064, India
| | - Swapan K. Pati
- Theoretical
Sciences Unit and ‡New Chemistry Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore
560064, India
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Samanta PK, Manna AK, Pati SK. Structural, Electronic, and Optical Properties of Metallo Base Pairs in Duplex DNA: A Theoretical Insight. Chem Asian J 2012; 7:2718-28. [DOI: 10.1002/asia.201200630] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Indexed: 12/23/2022]
Affiliation(s)
- Pralok K. Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064 (India), Fax: (+91) 80‐2208‐2766/2767
| | - Arun K. Manna
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064 (India), Fax: (+91) 80‐2208‐2766/2767
| | - Swapan K. Pati
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064 (India), Fax: (+91) 80‐2208‐2766/2767
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064 (India), Fax: (+91) 80‐2208‐2766/2767
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Abstract
We use first-principles density functional theory calculations to investigate the structural, energetic, bonding aspects, and optical properties of recently synthesized thieno-analogues of RNA nucleosides. The results are compared against the findings obtained for both the natural nucleosides as well as available experimental data. We find that the modified nucleosides form the hydrogen bonded Watson-Crick (WC) base pairing with similar H-bonding energy as obtained for the natural nucleosides. We have calculated and compared the charge transfer integrals for the H-bonded natural and thieno-modified nucleosides. We find that the thieno modification of these nucleosides strongly affects the charge transfer integrals due to the difference in extent of orbital delocalization in these two types of nucleosides. We also find that the degree of reduction of charge transfer integrals is larger for the H-bonded A-U pair than in the G-C pair. We also focus on the optical absorption properties of these thieno-modified nucleosides and their WC H-bonded base pairs in gas phase as well as with implicit water. Our calculated results show that the low energy peaks in the absorption spectra mainly arise because of the π-π* electronic transition for both the nucleosides, and the observed red shift for thieno-nucleosides compared to natural nucleosides are consistent with the calculated decrease in electronic gaps. Our results demonstrate that the thieno modification of natural nucleosides significantly modifies their electronic and optical properties, although the basic structural and bonding aspects remained the same. It also gives a microscopic understanding of the experimentally observed optical behaviors.
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Affiliation(s)
- Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
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Samanta PK, Periyasamy G, Manna AK, Pati SK. Computational studies on structural and optical properties of single-stranded DNA encapsulated silver/gold clusters. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16068d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Jana K, Samanta PK, Ghosh D. Evaluation of single intratesticular injection of calcium chloride for nonsurgical sterilization of male Black Bengal goats (Capra hircus): a dose-dependent study. Anim Reprod Sci 2005; 86:89-108. [PMID: 15721661 DOI: 10.1016/j.anireprosci.2004.05.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2002] [Revised: 05/14/2004] [Accepted: 05/25/2004] [Indexed: 11/21/2022]
Abstract
This study describes the induction of chemosterilization in three groups each of six adult male Black Bengal goats at 30 days after a single bilateral intratesticular injection of a calcium chloride (CaCl(2), 2H(2)O) solution at the doses of 10, 20 or 40 mg/kg body weight/testis, always in a 2 ml volume of normal saline. Another one group of animals received only 2 ml of normal saline per testis as a control. The induction of chemosterilization was measured using relative testicular weight as well as histomorphological parameters including seminiferous tubular architecture and germ cell association in seminiferous tubules along with morphology of the interstitial space. Biochemical markers included activities of testicular Delta(5), 3beta-hydroxysteroid dehydrogenase (Delta(5), 3beta-HSD), 17beta-hydroxysteroid dehydrogenase (17beta-HSD), catalase, glutathione peroxidase (GPx), glutathione S-transferase (GST) and superoxide dismutase (SOD) as well as monitoring the level of testicular thiobarbituric acid reactive substances (TBARS), conjugated dienes and reduced glutathione (GSH) content along with plasma concentrations of testosterone, LH and FSH. Histomorphological measures of testes showed total necrosis of testicular tissue at 30 days after an injection of either 20 or 40 mg CaCl(2) along with fibrosis in seminiferous tubules and interstitial spaces. Infiltration of leucocytes was observed with the 40 mg dose. Disintegration of germ cell arrangement in seminiferous tubules and washing out of germ cells from the tubules were noted with the 10mg dose. Relative organ weights, plasma concentrations of testosterone, testicular activities of Delta(5), 3beta-HSD, 17beta-HSD, catalase, GPx, GST, and SOD and testicular contents of GSH all were declined. Increases occurred in testicular TBARS, conjugated dienes and plasma concentrations of LH and FSH with each of the treatments by comparison with the control group. Plasma concentrations of cortisol and fasting blood sugar level as well as packed cell volume (PCV) and total plasma protein were recorded to monitor the changes of chronic stress in the experimental animals. Changes in these parameters were not significant. An intratesticular injection of calcium chloride at specified doses could be a suitable method of sterilization in preference to surgical castration of goats.
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Affiliation(s)
- Kuladip Jana
- Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences, 64/1/14 Belgachia Road (Milk Colony), 37 & 68 K.B. Sarani, Calcutta 700037, West Bengal, India.
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Manna I, Jana K, Samanta PK. Effect of different intensities of swimming exercise on testicular oxidative stress and reproductive dysfunction in mature male albino Wistar rats. Indian J Exp Biol 2004; 42:816-22. [PMID: 15573534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Swimming exercise for 1, 2 and 3 hr for 5 days/week for consecutive 4 weeks, results in a significant reduction in testicular, epididymal, prostetic, seminal vesicle somatic indices; epididymal sperm count, sperm motility; preleptotine spermatocytes, mid pachytene spermatocytes and stage 7 spermatids; plasma levels of testosterone, luteinizing hormone; testicular delta5, 3beta-hydroxysteroid dehydrogenase, 17beta-hydroxysteroid dehydrogenase; testicular superoxide dismutase, catalase, glutathione peroxidase, glutathione-s-transferase and glutathione along with significant elevation in malondialdehyde in male albino rats. However, no significant change was noted in final body weight, spermatogonia-A and plasma level of follicle stimulating hormone. The results that oxidative stress develops with the increasing of exercise intensity, which may interfere in male reproductive activities.
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Affiliation(s)
- I Manna
- Dept of Surgery & Radiology, West Bengal University of Animal & Fishery Sciences, Kolkata 700 037, India
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Manna I, Jana K, Samanta PK. Effect of intensive exercise-induced testicular gametogenic and steroidogenic disorders in mature male Wistar strain rats: a correlative approach to oxidative stress. Acta Physiol Scand 2003; 178:33-40. [PMID: 12713513 DOI: 10.1046/j.1365-201x.2003.01095.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS In order to investigate the effects of intensive exercise on reproductive dysfunctions in relation to oxidative stress, a total of 12 male rats (age: 3 months, weight: 127 +/- 2.86 g) were randomly divided into: (1) control group (CG, n = 6) and (2) experimental group (Exp. G, n = 6). METHODS An exercise protocol of 3 h swimming day(-1), 5 days week(-1) was followed for 4 weeks in Exp. G, with no exercise in CG. All the animals were killed; blood, testes and the accessory sex organs were collected for estimation of different parameters. RESULTS A significant diminution (P < 0.001) was noted in testicular Delta5, 3beta-hydroxy-steroid dehydrogenase (Delta5, 3beta-HSD), 17beta-hydroxy steroid dehydrogenase (17beta-HSD); plasma levels of testosterone, luteinizing hormone (LH); preleptotine spermatocytes (pLSc), midpachytene spermatocytes (mPSc) and stage 7 spermatids (7Sd); with no significant alteration in follicle stimulating hormone (FSH) and spermatogoia A (Asg) after intensive exercise. A significant elevation (P < 0.001) in malondialdehyde (MDA) and conjugated dienes (CD) along with significant reduction (P < 0.001) in glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), glutathione-s-transferase (GST) and peroxidase were found in testes of Exp. G. Moreover, the somatic index of testes and accessory sex organs were also decreased significantly (P < 0.001) after exercise. High correlations have been found in 17 beta-HSD with CAT (r = 0.90, P < 0.05) and peroxidase (r = 0.83, P < 0.05), epididymal somatic index with CD (r = -0.91; P < 0.05) and GSH (r = 0.84, P < 0.05). CONCLUSION The present study focused an chronic intensive exercise-induced oxidative stress that may cause dysfunctions in male reproductive system including steroidogenesis and spermatogenesis.
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Affiliation(s)
- I Manna
- Human Performance Laboratory, Sports Authority of India, J. N. Stadium, New Delhi, India
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Jana K, Samanta PK, Ghosh D. Dose-dependent response to an intratesticular injection of calcium chloride for induction of chemosterilization in adult albino rats. Vet Res Commun 2002; 26:651-73. [PMID: 12507039 DOI: 10.1023/a:1020976905746] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This study concerned the minimum and optimum effective doses of calcium chloride needed for induction of chemosterilization in male albino rats, 30 days after a single intratesticular injection of calcium chloride (CaCl2.2H2O) solution at 2.5, 5, 10 or 20 mg per 100 g body weight per testis. There was a significant diminution in the relative wet weight of the sex organs (p<0.01), epididymal sperm count (p<0.001), plasma concentration of testosterone (p<0.01), testicular activities of delta5,3beta-hydroxy steroid dehydrogenase (delta5,3beta-HSD), 17beta-hydroxy steroid dehydrogenase (17beta-HSD) (p<0.01), glutathione S-transferase (GST) (p<0.01), superoxide dismutase (SOD) (p<0.01), and peroxidase (p<0.01), significant elevations in testicular content of malondialdehyde (MDA) and conjugated dienes (p<0.01), along with derangement of seminiferous tubular architecture and degeneration of the Leydig cells in the testis and elevations in the concentrations in the plasma of LH and FSH (p<0.01), commencing at a dose of 5 mg, with the greatest effects at a dose of 20 mg. No significant alterations in these factors occurred at the dose of 2.5 mg in comparison to the control that received only the vehicle. There was no significant alteration in the plasma concentrations of prolactin (p>0.05), corticosterone (p>0.05) or fasting blood glucose or in the rectal temperature (p>0.05) at any of the doses relative to the control group, suggesting that this chemosterilizing procedure did not exert any chronic stress on the experimental animals. From these observations, it may be suggested that 5 mg should be considered as the minimum dose, and 10 mg or 20 mg as the optimum dose, whereas 2.5 mg was ineffective for induction of chemosterilization. There would seem to be little point in using more than 20 mg of calcium chloride for this purpose. Intratesticular injection of calcium chloride at an effective dose may be considered as an alternative to surgical castration.
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Affiliation(s)
- K Jana
- Reproductive Endocrinology and Family Welfare Research Unit, Department of Human Physiology with Community Health, Vidyasagar University, West Bengal, India
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