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Mishra K, Acharjee D, Das A, Ghosh S. Femtosecond Upconversion Study of Interfacial Electron Transfer from Photoexcited CsPbBr 3 Perovskite Nanocrystal to Rhodamine 6G. J Phys Chem B 2021; 125:11017-11025. [PMID: 34583511 DOI: 10.1021/acs.jpcb.1c05354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photoinduced electron transfer (PET) from an excited-state CsPbBr3 nanocrystal (NC) to rhodamine 6G (r6G) is studied in toluene using different fluorescence-based techniques. Because of weak solubility of r6G in toluene, excess r6G molecules adsorb at NC surface which result in a much slower rotational diffusion time scale of r6G in the presence of NCs. Study of intrinsic PET benefits from the soft molecular interactions leading to donor (NC)-acceptor (r6G) complex formation, where solvent diffusion parameters would not play any role in the PET kinetics. Femtosecond transients of NCs are nicely fit to a Poisson expression originally proposed by Tachiya. Conclusive fittings to the temperature dependence quenching data reveal two interesting observations: (1) Even though the average number of surface trap state in a NC does not change with temperature (5-60 °C), the trap-state-induced quenching time scale is accelerated with increase in temperature, pointing toward a more efficient trapping at higher temperature. (ii) In the presence of r6G, a fast (∼150 ps per r6G molecule) interfacial PET time scale is observed, which remains unaffected by temperature (5-60 °C). Our findings demonstrate that even a simple "perovskite NC-electron acceptor" composite like that in the present study can ensure a rapid interfacial charge separation. Such information will help us to realize the actual potential of perovskites NCs in their real applications.
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Affiliation(s)
- Krishna Mishra
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Debopam Acharjee
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Ayendrila Das
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
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2
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Saladin M, Rumble CA, Wagle DV, Baker GA, Maroncelli M. Characterization of a New Electron Donor-Acceptor Dyad in Conventional Solvents and Ionic Liquids. J Phys Chem B 2019; 123:9395-9407. [PMID: 31596593 DOI: 10.1021/acs.jpcb.9b07077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Ionic liquids are being tested as potential replacements for current electrolytes in energy-related applications. Electron transfer (ET) plays a central role in these applications, making it essential to understand how ET in ionic liquids differs from ET in conventional organic solvents and how these differences affect reaction kinetics. A new intramolecular electron donor-acceptor probe was synthesized by covalently linking the popular photoacceptor coumarin 152 with the donor dimethylaniline to create the dyad "C152-DMA" for potential use in probing dynamical solvent effects in ionic liquids. Molecular dynamics simulations of this dyad show the considerable conformational flexibility of the linker group but over a range of geometries in which the ET rate parameters vary little and should have minimal effect on reaction times >100 ps. Steady-state and time-resolved fluorescence methods show the spectra of C152-DMA to be highly responsive to solvent polarity, with ET rates varying over the range of 108 to 1012 s-1 between nonpolar and high-polarity conventional solvents. The sensitivity to hydrolysis in the presence of acidic impurities limits the dyad's use to ionic liquids of high purity. The results in the few ionic liquids examined here suggest that in addition to solvent polarity, electron transfer in C152-DMA also depends on solvent fluidity or solvation times.
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Affiliation(s)
- Marissa Saladin
- Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Christopher A Rumble
- Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Durgesh V Wagle
- Department of Chemistry , University of Missouri - Columbia , Columbia , Missouri 65211 , United States
| | - Gary A Baker
- Department of Chemistry , University of Missouri - Columbia , Columbia , Missouri 65211 , United States
| | - Mark Maroncelli
- Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
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3
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Samanta P, Halder P, Bahadur P, Dutta Choudhury S, Pal H. Effect of Ionic Liquids as Cosurfactants on Photoinduced Electron Transfer in Tetronic Micelles. J Phys Chem B 2018; 122:10190-10201. [PMID: 30351120 DOI: 10.1021/acs.jpcb.8b08766] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study investigates the role of varying alkyl chain lengths of a series of surface-active 1-alkyl-3-methylimidazolium tetrafluoroborate ([C nMIm][BF4], n = 4, 6, and 10) ionic liquids (ILs) as cosurfactants in modifying the micellar characteristics of a tetronic star-block copolymer, T1304, and the consequent effects on bimolecular photoinduced electron transfer (PET) reactions carried out in these T1304-IL mixed micellar systems. Using coumarin 153 as the probe dye and following ground-state absorption, steady-state fluorescence, and time-resolved emission measurements, the micropolarity, microviscosity, and solvent relaxation dynamics in the micellar palisade layer have been revealed both in pure T1304 and in T1304-IL systems. With increasing alkyl chain length of the ILs, the palisade layer of the micelles gradually becomes more polar and less viscous, suggesting better incorporation of the longer alkyl chain length ILs as cosurfactants into the T1304 micelles. The bimolecular PET reactions, involving 7-aminocoumarins as acceptors and N, N-dimethylaniline as the donor, are considerably modulated in T1304 micelles by the presence of the ILs, the effect being more prominent for ILs with longer alkyl chain lengths. In all of the micellar systems, correlations of the electron transfer (ET) kinetics with the reaction exergonicity (-Δ G0) show clear Marcus inversion (MI) behavior where onsets of MI invariably appear at significantly lower exergonicities, suggesting the involvement of a two-dimensional ET mechanism. Interestingly, the Marcus correlations display significant variations, namely, enhanced reaction rates and gradual shift in the onset of MI toward higher exergonicity, as longer alkyl chain length ILs are sequentially introduced as cosurfactants. From the observed results, it is convincingly realized that 1-alkyl-3-methylimidazolium-based ILs can be used satisfactorily as cosurfactants in tetronic star-block copolymer solutions to modulate PET reactions very significantly for their better utilizations in suitable applied areas.
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Affiliation(s)
- Papu Samanta
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
| | | | - Pratap Bahadur
- Department of Chemistry , Veer Narmad South Gujarat University , Surat 395007 , India
| | | | - Haridas Pal
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
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Samanta P, Rane S, Bahadur P, Dutta Choudhury S, Pal H. Tetronic Star Block Copolymer Micelles: Photophysical Characterization of Microenvironments and Applicability for Tuning Electron Transfer Reactions. J Phys Chem B 2018; 122:6079-6093. [DOI: 10.1021/acs.jpcb.8b01778] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Papu Samanta
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | | | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, India
| | | | - Haridas Pal
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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5
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Dutta Choudhury S, Vir P, Mohanty J, Bhasikuttan AC, Pal H. Selective prototropism of lumichrome in cationic micelles and reverse micelles: a photophysical perspective. RSC Adv 2016. [DOI: 10.1039/c5ra23562f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BHDC micelles and reverse micelles selectively transform the alloxazine form of lumichrome to the anionic isoalloxazine form, around neutral pH.
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Affiliation(s)
| | - Praveen Vir
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | | | - Haridas Pal
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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6
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Tojo C, Buceta D, López-Quintela MA. Understanding the Metal Distribution in Core-Shell Nanoparticles Prepared in Micellar Media. NANOSCALE RESEARCH LETTERS 2015; 10:1048. [PMID: 26303140 PMCID: PMC4547971 DOI: 10.1186/s11671-015-1048-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 08/13/2015] [Indexed: 06/04/2023]
Abstract
The factors that govern the reaction rate of Au/Pt bimetallic nanoparticles prepared in microemulsions by a one-pot method are examined in the light of a simulation model. Kinetic analysis proves that the intermicellar exchange has a strong effect on the reaction rates of the metal precursors. Relating to Au, reaction rate is controlled by the intermicellar exchange rate whenever concentration is high enough. With respect to Pt, the combination of a slower reduction rate and the confinement of the reactants inside micelles gives rise to an increase of local Pt salt concentration. Two main consequences must be emphasized: On one hand, Pt reduction may continue independently whether or not a new intermicellar exchange takes place. On the other hand, the accumulation of Pt reactants accelerates the reaction. As the reactant accumulation is larger when the exchange rate is faster, the resulting Pt rate increases. This results in a minor difference in the reduction rate of both metals. This difference is reflected in the metal distribution of the bimetallic nanoparticle, which shows a greater degree of mixture as the intermicellar exchange rate is faster.
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Affiliation(s)
- Concha Tojo
- />Physical Chemistry Department, University of Vigo, E-36310 Vigo, Spain
| | - David Buceta
- />Laboratorio de Magnetismo y Nanotecnología, Instituto de Investigaciones Tecnológicas, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - M. Arturo López-Quintela
- />Laboratorio de Magnetismo y Nanotecnología, Instituto de Investigaciones Tecnológicas, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
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7
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Altamirano MS, Previtali CM. Photoionization processes of charged pyrene derivatives in reverse micelles. The effect of the interfacial charge. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.05.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Tojo C, de Dios M, Buceta D, López-Quintela MA. Cage-like effect in Au-Pt nanoparticle synthesis in microemulsions: a simulation study. Phys Chem Chem Phys 2015; 16:19720-31. [PMID: 25115366 DOI: 10.1039/c4cp02936d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The different distributions of metals in bimetallic nanoparticles synthesized in microemulsions were studied by computer simulation. The simulations demonstrated that if the difference between the reduction potentials of both metals is about 0.15-0.3 V, the compartmentalization of the reaction media causes the accumulation of slower reduction reactants in the microemulsions droplets, which favours the chemical reaction like a cage effect: increasing the local concentration of the slower reduction metal salt gives rise to a faster reduction, so the differences in reduction rates of both metals are attenuated. A more coincidental reduction of both metals deeply affects the nanoparticle structure, causing a better mixed alloy. This effect will be more pronounced when the concentration is higher and the intermicellar exchange rate is faster. This means that for any fixed microemulsion the nanoparticle structure can be modified by changing the reactant concentration: the core can be enriched in the faster reduction metal by lower concentrations, and the shell can be enriched in the slower metal by higher concentrations. Based on these observations, this study suggests a route to help experimentalists better create nanoparticles with a pre-defined structure.
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Affiliation(s)
- C Tojo
- Physical Chemistry Department, Faculty of Chemistry, University of Vigo, E-36310 Vigo, Spain.
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9
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Tojo C, González E, Vila-Romeu N. The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1966-1979. [PMID: 25383307 PMCID: PMC4222381 DOI: 10.3762/bjnano.5.206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 10/02/2014] [Indexed: 06/04/2023]
Abstract
A kinetic study on the formation of bimetallic nanoparticles in microemulsions was carried out by computer simulation. A comprehensive analysis of the resulting nanostructures was performed regarding the influence of intermicellar exchange on reactivity. The objects of this study were metals having a difference in standard reduction potential of about 0.2-0.3 V. Relatively flexible microemulsions were employed and the concentration of the reactants was kept constant, while the reaction rate of each metal was monitored as a function of time using different reactant proportions. It was demonstrated that the reaction rates depend not only on the chemical reduction rate, but also on the intermicellar exchange rate. Furthermore, intermicellar exchange causes the accumulation of slower precursors inside the micelles, which favors chemical reduction. As a consequence, slower reduction rates strongly correlate with the number of reactants in this confined media. On the contrary, faster reduction rates are limited by the intermicellar exchange rate and not the number of reactants inside the micelles. As a result, different precursor proportions lead to different sequences of metal reduction, and thus the arrangement of the two metals in the nanostructure can be manipulated.
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Affiliation(s)
- Concha Tojo
- Physical Chemistry Department, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain
| | - Elena González
- Physical Chemistry Department, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain
| | - Nuria Vila-Romeu
- Physical Chemistry Department, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain
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10
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Kumbhakar M, Manna A, Sayed M, Kumar A, Pal H. Observation of the Marcus Inverted Region for Bimolecular Photoinduced Electron-Transfer Reactions in Viscous Media. J Phys Chem B 2014; 118:10704-15. [DOI: 10.1021/jp506885r] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Arpan Manna
- Physical
and Material Chemistry Division, CSIR-National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Mhejabeen Sayed
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Anil Kumar
- Physical
and Material Chemistry Division, CSIR-National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Haridas Pal
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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11
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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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12
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Locations of methanol in methanol-containing AOT reverse micelles revealed by photophysics of IR125. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2012.12.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Lemons BG, Richens DT, Anderson A, Sedgwick M, Crans DC, Johnson MD. Stabilization of a vanadium(v)–catechol complex by compartmentalization and reduced solvation inside reverse micelles. NEW J CHEM 2013. [DOI: 10.1039/c2nj40524e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Johnson MD, Lorenz BB, Wilkins PC, Lemons BG, Baruah B, Lamborn N, Stahla M, Chatterjee PB, Richens DT, Crans DC. Switching Off Electron Transfer Reactions in Confined Media: Reduction of [Co(dipic)2]− and [Co(edta)]− by Hexacyanoferrate(II). Inorg Chem 2012; 51:2757-65. [DOI: 10.1021/ic201247v] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael D. Johnson
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Bret B. Lorenz
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Patricia C. Wilkins
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Brant G. Lemons
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Bharat Baruah
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Nathan Lamborn
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Michelle Stahla
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Pabitra B. Chatterjee
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - David T. Richens
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Debbie C. Crans
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
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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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16
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Ghatak C, Rao VG, Mandal S, Sarkar N. Photoinduced electron transfer between various coumarin analogues and N,N-dimethylaniline inside niosome, a nonionic innocuous polyethylene glycol-based surfactant assembly. Phys Chem Chem Phys 2012; 14:8925-35. [DOI: 10.1039/c2cp23209j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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17
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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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18
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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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19
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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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20
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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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21
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Bernal E, Marchena M, Sánchez F. Microheterogeneous catalysis. Molecules 2010; 15:4815-74. [PMID: 20657395 PMCID: PMC6257643 DOI: 10.3390/molecules15074815] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 06/23/2010] [Accepted: 07/05/2010] [Indexed: 12/04/2022] Open
Abstract
The catalytic effect of micelles, polymers (such as DNA, polypeptides) and nanoparticles, saturable receptors (cyclodextrins and calixarenes) and more complex systems (mixing some of the above mentioned catalysts) have been reviewed. In these microheterogeneous systems the observed changes in the rate constants have been rationalized using the Pseudophase Model. This model produces equations that can be derived from the Brönsted equation, which is the basis for a more general formulation of catalytic effects, including electrocatalysis. When, in the catalyzed reaction one of the reactants is in the excited state, the applicability (at least formally) of the Pseudophase Model occurs only in two limiting situations: the lifetime of the fluorophore and the distributions of the quencher and the probe are the main properties that define the different situations.
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Affiliation(s)
- Eva Bernal
- Department of Physical Chemistry, University of Seville, C/Profesor García González, s/n, 41012, Seville, Spain.
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22
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Mahata A, Sarkar D, Bose D, Ghosh D, Das P, Chattopadhyay N. Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles. J Colloid Interface Sci 2009; 335:234-41. [DOI: 10.1016/j.jcis.2009.03.086] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 02/28/2009] [Accepted: 03/02/2009] [Indexed: 10/20/2022]
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23
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Singh PK, Kumbhakar M, Pal H, Nath S. Ultrafast Torsional Dynamics of Protein Binding Dye Thioflavin-T in Nanoconfined Water Pool. J Phys Chem B 2009; 113:8532-8. [DOI: 10.1021/jp902207k] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Mahata A, Sarkar D, Bose D, Ghosh D, Girigoswami A, Das P, Chattopadhyay N. Photophysics and Rotational Dynamics of a β-Carboline Analogue in Nonionic Micelles: Effect of Variation of Length of the Headgroup and the Tail of the Surfactant. J Phys Chem B 2009; 113:7517-26. [DOI: 10.1021/jp900575e] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atanu Mahata
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Deboleena Sarkar
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Debosreeta Bose
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Debanjana Ghosh
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | | - Paramita Das
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
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25
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The use of coumarins as environmentally-sensitive fluorescent probes of heterogeneous inclusion systems. Molecules 2009; 14:210-37. [PMID: 19127249 PMCID: PMC6253935 DOI: 10.3390/molecules14010210] [Citation(s) in RCA: 310] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 12/23/2008] [Accepted: 01/04/2009] [Indexed: 11/16/2022] Open
Abstract
Coumarins, as a family of molecules, exhibit a wide range of fluorescence emission properties. In many cases, this fluorescence is extremely sensitive to the local environment of the molecule, especially the local polarity and microviscosity. In addition, coumarins show a wide range of size, shape, and hydrophobicity. These properties make them especially useful as fluorescent probes of heterogeneous environments, such as supramolecular host cavities, micelles, polymers and solids. This article will review the use of coumarins to probe such heterogeneous systems using fluorescence spectroscopy.
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26
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Choudhury SD, Nath S, Pal H. Excited-State Proton Transfer Behavior of 7-Hydroxy-4-methylcoumarin in AOT Reverse Micelles. J Phys Chem B 2008; 112:7748-53. [DOI: 10.1021/jp8004019] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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27
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Kumbhakar M, Singh PK, Nath S, Bhasikuttan AC, Pal H. Ultrafast Bimolecular Electron Transfer Dynamics in Micellar Media. J Phys Chem B 2008; 112:6646-52. [DOI: 10.1021/jp800752d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | | | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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28
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Verma P, Nath S, Singh PK, Kumbhakar M, Pal H. Effects of Block Size of Pluronic Polymers on the Water Structure in the Corona Region and Its Effect on the Electron Transfer Reactions. J Phys Chem B 2008; 112:6363-72. [DOI: 10.1021/jp711642x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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29
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Hore DK, Walker DS, Richmond GL. Water at Hydrophobic Surfaces: When Weaker Is Better. J Am Chem Soc 2008; 130:1800-1. [DOI: 10.1021/ja0755616] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Dennis K. Hore
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403
| | - Dave S. Walker
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403
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30
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Choudhury SD, Kumbhakar M, Nath S, Pal H. Photoinduced bimolecular electron transfer kinetics in small unilamellar vesicles. J Chem Phys 2007; 127:194901. [DOI: 10.1063/1.2794765] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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