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Karar M, Paul P, Mistri R, Majumdar T, Mallick A. Dual macrocyclic chemical input based highly protective molecular keypad lock using fluorescence in solution phase: A new type approach. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Samanta P, Dutta Choudhury S, Pal H. Kinetics and Energetics of Ultrafast Bimolecular Photoinduced Electron Transfer Reactions in Pluronic-Surfactant Supramolecular Assemblies. J Phys Chem B 2019; 123:5942-5953. [PMID: 31246469 DOI: 10.1021/acs.jpcb.9b04223] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the kinetics and energetics of photoinduced electron transfer (PET) reactions in constrained media has attracted considerable research interest, as constrained media provide a handle to tune the microenvironments and consequently the mechanisms of PET reactions. In this study, PET reactions between excited 7-aminocoumarin acceptors and ground-state N,N-dimethylaniline (DMAN) donor have been investigated in mixed micellar media composed of triblock copolymer, P123, and anionic surfactant, sodium dodecyl sulfate (SDS), with varying SDS-to-P123 molar ratios (n values). The objective is to elucidate the role of the n values in the rates and energetics of PET reactions over the entire time range from the subpicosecond to the subnanosecond domain, especially in regard to the applicability of the two-dimensional ET (2DET) mechanism. It is observed that by changing the n values, there is a significant change in the hydration characteristics of the SDS-P123 mixed micelles, which in turn changes the kinetics to energetic correlations for the PET reactions. Fluorescence from the excited coumarin acceptors undergoes substantial quenching due to PET from DMAN donor in all of the studied micelles as evidenced from steady-state, subnanosecond time-resolved (TR) and ultrafast (subpicosecond/femtosecond) fluorescence up-conversion measurements. The quenching rate constants (kq), estimated from subnanosecond TR fluorescence studies, and the individual component-wise decay rates (τi-1), estimated from up-conversion measurements, increase gradually with increasing n value, corroborating well with the sequentially increased micropolarity of the mixed micelles. Interestingly, it is observed that the correlations of either kq (from subnanosecond studies) or τi-1 (from femtosecond studies) with the reaction exergonicity (-ΔG°) show the noteworthy Marcus inversion (MI) behavior in a very consistent and similar manner for the entire time window, from subpicoseconds to subnanoseconds. The onset of MI always appears at an exergonicity (-ΔG°MI) much lower than solvent reorganization energy (λs), suggesting the involvement of 2DET mechanism throughout the subpicosecond to subnanosecond time domains. The present results thus provide a comprehensive picture of the kinetics and energetics of the PET reactions in constrained media for the whole time span and unequivocally establish the applicability of 2DET mechanism for the PET reactions in constrained media, eliminating any apprehensions about the effect of time resolution of the subnanosecond setup on the observed Marcus inversion behavior. This is indeed an important finding, providing valuable insights for PET reactions in constrained media, which has not been explored explicitly in any of the previous studies. Observation of MI behavior and the modulations in the PET reactions by simply changing the composition of SDS in the SDS-P123 mixed micelles are noteworthy findings of the present study and are expected to find suitable applications for better utilization and outcome of the PET reactions.
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Affiliation(s)
- Papu Samanta
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
| | | | - Haridas Pal
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
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Hu C, Du Z, Tai X, Liu X. Study on the interactions between SDBS/SOE-60 mixed surfactant and PVP in solution. J Appl Polym Sci 2018. [DOI: 10.1002/app.46717] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Chang Hu
- China Research Institute of Daily Chemical Industry, No. 34 Wenyuan Road; Taiyuan 030001 People's Republic of China
| | - Zhiping Du
- China Research Institute of Daily Chemical Industry, No. 34 Wenyuan Road; Taiyuan 030001 People's Republic of China
- Institute of Resources and Environment Engineering; Shanxi University, No. 92 Wucheng Road; Taiyuan 030006 People's Republic of China
| | - Xiumei Tai
- China Research Institute of Daily Chemical Industry, No. 34 Wenyuan Road; Taiyuan 030001 People's Republic of China
| | - Xiaoying Liu
- China Research Institute of Daily Chemical Industry, No. 34 Wenyuan Road; Taiyuan 030001 People's Republic of China
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Chakraborty B, Sengupta C, Pal U, Basu S. Acridone in a biological nanocavity: detailed spectroscopic and docking analyses of probing both the tryptophan residues of bovine serum albumin. NEW J CHEM 2017. [DOI: 10.1039/c7nj02454a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
AD initially gets hooked to Trp 212 housed in domain IIA, inducing conformational changes in the protein and paving the way for the ligand to reach Trp 134 located in domain IB.
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Affiliation(s)
| | | | - Uttam Pal
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
- Homi Bhaba National Institute
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Verma P, Pal H. Tuning of electron transfer reactions in pluronic-surfactant supramolecular assemblies. Phys Chem Chem Phys 2015; 17:15400-11. [PMID: 26006183 DOI: 10.1039/c5cp01480h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoinduced electron transfer (ET) reaction between an anionic acceptor, coumarin-343 (C343), and a neutral donor, N,N-dimethylaniline (DMAN), has been investigated in composite supramolecular assemblies (mixed micelles) comprised of a pluronic copolymer (P123: EO20-PO70-EO20 or F88: EO103-PO39-EO103 where EO: ethylene oxide and PO: propylene oxide) and a cationic surfactant (CTAC: cetyltrimethylammonium chloride), following fluorescence quenching studies. Systematic increase in the quenching rates for the studied donor-acceptor system with the increasing CTAC to pluronic molar ratio in the mixed micelles demonstrates a large modulation in the ET rates. The mixed micellar systems in the present cases are formed through the incorporation of the hydrocarbon chains of CTAC into the poly-PO core of the pluronic micelles whereby the cationic head groups of CTAC are placed at the periphery of the micellar core, protruded into the hydrated poly-EO corona region, leading to the formation of a positively charged layer deep inside these mixed micelles. Thus, the anionic C343 dye, initially dissolved at the micelle-water interface, experiences a gradually increasing electrostatic attraction and is therefore systematically dragged deeper inside the micellar corona, as the CTAC composition is increased in the mixed micellar systems. Consequently, the ET rate of the C343-DMAN pair undergoes a large enhancement in the studied mixed micellar systems with the increasing CTAC to pluronic molar ratio. The present strategy of modulating ET reactions using such composite supramolecular assemblies can find applications in areas where bimolecular ET is an integral reaction step.
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Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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Sengupta C, Basu S. A spectroscopic study to decipher the mode of interaction of some common acridine derivatives with CT DNA within nanosecond and femtosecond time domains. RSC Adv 2015. [DOI: 10.1039/c5ra13035b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Our spectroscopic investigation with acridine derivatives presents the electronic control of their substituents on intercalation, solvation and PET with DNA.
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Affiliation(s)
- Chaitrali Sengupta
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata 700 064
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata 700 064
- India
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Ghosh S, Chattopadhyay N. Modification of the photophysics of 3-hydroxyflavone in aqueous solutions of imidazolium-based room temperature ionic liquids: a comparison between micelle-forming and non micelle-forming ionic liquids. RSC Adv 2015. [DOI: 10.1039/c5ra03833b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fluorometric techniques have been exploited to study the photophysical behaviour of an ESIPT probe, 3HF, in two imidazolium-based room temperature ionic liquids, one micelle-forming and the other non micelle-forming.
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Affiliation(s)
- Saptarshi Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata – 700 032
- India
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Chatterjee S, Prajapati R, Bhattacharya A, Mukherjee TK. Microscopic evidence of "necklace and bead"-like morphology of polymer-surfactant complexes: a comparative study on poly(vinylpyrrolidone)-sodium dodecyl sulfate and poly(diallyldimethylammonium chloride)-sodium dodecyl sulfate systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9859-9865. [PMID: 25105837 DOI: 10.1021/la5022615] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Here, we report the microscopic evidence of "necklace and bead"-like morphology, which has long been the most widely accepted model for polymer-surfactant complexes. The lack of microscopic evidence of the initial complexation between surfactant and polymer has resulted in many contradictory reports in the literature. In this paper, we visualized these initial complexes formed between negatively charged surfactant sodium dodecyl sulfate (SDS) with neutral poly(vinylpyrrolidone) (PVP) and cationic poly(diallyldimethylammonium chloride) (PDADMAC) polymer through photoluminescence (PL) microscopy and atomic force microscopy (AFM) using silicon quantum dot (Si QD) as an external PL marker. It is observed that, for the PVP-SDS system, SDS molecules bind at the hydrophobic sites on the random-coiled PVP chain through their hydrocarbon tails, while for the PDADMAC-SDS system, SDS head groups are associated with the positively charged nitrogen centers of the polymer, where the polymer chain wraps around the surfactant head groups.
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Affiliation(s)
- Surajit Chatterjee
- Discipline of Chemistry, Indian Institute of Technology (IIT) Indore , M-Block, IET-DAVV Campus, Khandwa Road, Indore, Madhya Pradesh 452017, India
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Ganguly A, Paul BK, Ghosh S, Dalapati S, Guchhait N. Interaction of a potential chloride channel blocker with a model transport protein: a spectroscopic and molecular docking investigation. Phys Chem Chem Phys 2014; 16:8465-75. [DOI: 10.1039/c3cp53843e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline in imidazolium based room temperature ionic liquids: Effect of the cation's alkyl chain length on the bimolecular photoinduced electron transfer process. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.03.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Paul BK, Ray D, Guchhait N. Binding Interaction and Rotational-Relaxation Dynamics of a Cancer Cell Photosensitizer with Various Micellar Assemblies. J Phys Chem B 2012; 116:9704-17. [DOI: 10.1021/jp304280m] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Bijan Kumar Paul
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009,
India
| | - Debarati Ray
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009,
India
| | - Nikhil Guchhait
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009,
India
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Lopez-Lopez M, Sanchez F, Marchena M. Determination of Reaction and Reorganization Free Energies of Electron Transfer Reactions under Restricted Geometry Conditions. PROGRESS IN REACTION KINETICS AND MECHANISM 2012. [DOI: 10.3184/146867812x13382026560489] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this paper, different methods of obtaining the two parameters controlling the rate of electron transfer processes (reaction and reorganization free energies, Λ and Δ G0’, respectively) under restricted geometry conditions are considered. The main difficulty of accomplishing this comes from lack of knowledge of the properties in the interfacial region, where the reaction occurs. A general method has been presented and illustrated with the study of intermolecular processes in micelles. This method is optimized when the free energies for (at least) the three reactions required are quite different. For excited state electron transfer, the general approach is based on the appearance of the so-called Marcus inverted region: at the starting point of this region the value of Δ G0’ gives the value of Λ directly. These reaction free energies also present some uncertainties because in their calculation it is necessary to know the value of the local dielectric constant. Finally, it should be mentioned that some authors have suggested that the treatments for electron transfer reactions could not be applicable under restricted conditions. However, experiments do seem to show the applicability of the Marcus-Hush treatment under these conditions.
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Affiliation(s)
- Manuel Lopez-Lopez
- The Department of Physical Chemistry. University of Seville. c/Profesor García González s/n. 41012 Sevilla. Spain
| | - Francisco Sanchez
- The Department of Physical Chemistry. University of Seville. c/Profesor García González s/n. 41012 Sevilla. Spain
| | - María Marchena
- The Department of Physical Chemistry. University of Seville. c/Profesor García González s/n. 41012 Sevilla. Spain
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Dhenadhayalan N, Selvaraju C. Role of photoionization on the dynamics and mechanism of photoinduced electron transfer reaction of coumarin 307 in micelles. J Phys Chem B 2012; 116:4908-20. [PMID: 22486406 DOI: 10.1021/jp301412c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamics and mechanism of the photoinduced electron transfer (PET) reaction between coumarin 307 (C307) and aromatic amines in micelles have been studied by using steady-state (S-S) and time-resolved (T-R) absorption and fluorescence spectroscopy. Based on the fluorescence quenching time scale, PET in micelles is grouped into two types: (i) ultrafast electron transfer (ET) due to the close contact of the donor and acceptor in micelles and (ii) diffusion averaged dynamic electron transfer (DADET) which is controlled by the diffusion of the reactants in micellar Stern layer and diffusion of the micelles. The DADET does not affect the photoionization and solvation processes whereas ultrafast ET competes with the photoionization and faster than the solvation process. Both ultrafast and DADET shows Marcus inversion in the ET rates at the similar exergonicity and indicates that the role of diffusion and solvent reorganization is negligible toward the activation barrier for the ET reaction in micelles. The activation barrier for the ET reactions in micelles is mainly due to intramolecular reorganization energy. The intramolecular reorganization energy must be higher in CTAB due to the photoionization and subsequent recombination and also involvement of triplet state in the PET. The ET reaction between coumarin radical cation and amine is reported for the first time in the C307-amine systems in micelles which are confirmed by the effect on amine concentration of the decay of coumarin radical cation and the dynamics of the ground-state recovery of C307. A mechanism for the PET reaction between C307-amine systems is proposed in micelles including photoionization, ultrafast and dynamic ET, and solvation dynamics.
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Moreno D, Díaz de Greñu B, García B, Ibeas S, Torroba T. A turn-on fluorogenic probe for detection of MDMA from ecstasy tablets. Chem Commun (Camb) 2012; 48:2994-6. [PMID: 22314849 DOI: 10.1039/c2cc17823k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a fluorogenic probe that is able to discriminate a range of primary or secondary biogenic amines and their natural or synthetic mimics, in water or buffer, by means of the turn-on transient generation of green fluorescence, with high quantum yields and low detection limits, thus making the system suitable for the detection of abuse drugs, such as MDMA, from ecstasy tablets.
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Affiliation(s)
- Daniel Moreno
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain
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Sarkar S, Mandal S, Ghatak C, Rao VG, Ghosh S, Sarkar N. Photoinduced Electron Transfer in an Imidazolium Ionic Liquid and in Its Binary Mixtures with Water, Methanol, and 2-Propanol: Appearance of Marcus-Type of Inversion. J Phys Chem B 2012; 116:1335-44. [DOI: 10.1021/jp2075995] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Souravi Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Chiranjib Ghatak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Paul BK, Guchhait N. Differential interactions of a biological photosensitizer with liposome membranes having varying surface charges. Photochem Photobiol Sci 2012; 11:661-73. [DOI: 10.1039/c2pp05346b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Paul BK, Guchhait N. Exploring the strength, mode, dynamics, and kinetics of binding interaction of a cationic biological photosensitizer with DNA: implication on dissociation of the drug-DNA complex via detergent sequestration. J Phys Chem B 2011; 115:11938-49. [PMID: 21899350 DOI: 10.1021/jp206589e] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The present study aims at exploring a detailed characterization of the binding interaction of a promising cancer cell photosensitizer, harmane (HM), with DNA extracted from herring sperm. The polarity-sensitive prototropic transformation of HM, a naturally occurring, fluorescent, drug-binding alkaloid, β-carboline, is remarkably modified upon interaction with DNA and is manifested through significant modulations on the absorption and emission profiles of HM. From the series of studies undertaken in the present program, for example, absorption; steady-state emission; the effect of chaotrope (urea); iodide ion-induced steady-state fluorescence quenching; circular dichroism (CD); and helix melting from absorption spectroscopy; the mode of binding of HM into the DNA helix has been substantiated to be principally intercalative. Concomitantly, a discernible dependence of the photophysics of the DNA-bound drug on the medium ionic strength indicates that electrostatic attraction should not be ignored in the interaction. Efforts have also been delivered to delineate the dynamical aspects of the interaction, such as modulation in time-resolved fluorescence decay and rotational relaxation dynamics of the drug within the DNA environment. In view of the prospective biological applications of HM, the issue of facile dissociation of intercalated HM from the DNA helix also comprises a crucial prerequisite for the functioning as an effective therapeutic agent. In this context, our results imply that the concept of detergent-sequestered dissociation of the drug from the drug-DNA complex can be a prospective strategy through an appropriate choice of the detergent molecule. The utility of the present work resides in exploring the potential applicability of the fluorescence property of HM for studying its interactions with a relevant biological target, for example, DNA. In addition, the methods and techniques used in the present work can also be exploited to study the interaction of HM with other biological, biomimicking assemblies and drug delivery vehicles, and so forth.
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Affiliation(s)
- Bijan Kumar Paul
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009, India
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Paul BK, Guchhait N. Modulation of Prototropic Activity and Rotational Relaxation Dynamics of a Cationic Biological Photosensitizer within the Motionally Constrained Bio-environment of a Protein. J Phys Chem B 2011; 115:10322-34. [DOI: 10.1021/jp2015275] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bijan Kumar Paul
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009, India
| | - Nikhil Guchhait
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009, India
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Sarkar S, Mandal S, Pramanik R, Ghatak C, Rao VG, Sarkar N. Photoinduced Electron Transfer in a Room Temperature Ionic Liquid 1-Butyl-3-methylimidazolium Octyl Sulfate Micelle: A Temperature Dependent Study. J Phys Chem B 2011; 115:6100-10. [DOI: 10.1021/jp201702x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Souravi Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Rajib Pramanik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Chiranjib Ghatak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Sarkar S, Pramanik R, Ghatak C, Rao VG, Sarkar N. Characterization of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][Tf2N])/TX-100/cyclohexane ternary microemulsion: Investigation of photoinduced electron transfer in this RTIL containing microemulsion. J Chem Phys 2011; 134:074507. [DOI: 10.1063/1.3548834] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Kumbhakar M, Dey S, Singh PK, Nath S, Satpati AK, Gangully R, Aswal VK, Pal H. Tuning of Intermolecular Electron Transfer Reaction by Modulating the Microenvironment Inside Copolymer−Surfactant Supramolecular Assemblies. J Phys Chem B 2011; 115:1638-51. [DOI: 10.1021/jp109217v] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Swayandipta Dey
- Chemistry Department, Pondicherry University, Kalapet, Pondicherry 605014, India
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Zhu R, Lu R, Yu A. Photophysics and locations of IR125 and C152 in AOT reverse micelles. Phys Chem Chem Phys 2011; 13:20844-54. [DOI: 10.1039/c1cp21946d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kumbhakar M, Singh PK, Satpati AK, Nath S, Pal H. Ultrafast Electron Transfer Dynamics in Micellar Media Using Surfactant as the Intrinsic Electron Acceptor. J Phys Chem B 2010; 114:10057-65. [DOI: 10.1021/jp102258y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation & Photochemistry Division, and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat Kumar Singh
- Radiation & Photochemistry Division, and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Ashis Kumar Satpati
- Radiation & Photochemistry Division, and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radiation & Photochemistry Division, and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Bhattacharya B, Nakka S, Guruprasad L, Samanta A. Interaction of bovine serum albumin with dipolar molecules: fluorescence and molecular docking studies. J Phys Chem B 2009; 113:2143-50. [PMID: 19199686 DOI: 10.1021/jp808611b] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Interaction of bovine serum albumin (BSA) with two series of dipolar molecules having both rigid and flexible structures has been studied by monitoring the spectral and temporal behavior of the intramolecular charge transfer fluorescence of the systems. The binding sites of the molecular systems in BSA have been located with the help of docking studies. Three different sites of varying hydrophobicity have been identified where these molecules are located. Binding in the hydrophobic domains of BSA leads to a blue shift of the fluorescence spectra and an enhancement of fluorescence intensity and lifetime. This enhancement is found to be the largest for flexible systems in which internal motion serves as a nonradiative decay route. In the BSA-bound condition, some of the dipolar molecules exhibit not-so-common "dip-rise-dip" time-resolved fluorescence anisotropy profiles. It is shown that a large difference of the fluorescence lifetimes of the protein-bound and unbound molecules is one of the factors that contributes to this kind of anisotropy profiles. As internal motion is often responsible for the short fluorescence lifetime of the flexible dipolar molecules, a large increase in the fluorescence lifetime of these systems occurs if binding to BSA leads to disruption/prevention of this motion. It thus appears that it might be possible to obtain information on the prevention/disruption of nonradiative pathway on protein binding from the anisotropy profiles of the kind discussed above. However, since the present study reveals cases where a large change in fluorescence lifetime also occurs due to other reasons, one needs to be careful prior to making any conclusion.
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