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Aggrawal R, Halder S, Dyagala S, Saha SK. Role of Dual Nature of Ionic Liquid in Solvation Dynamics and Rotational Diffusion in Mixed Micelles: A Time‐Resolved Fluorescence and Fluorescence Anisotropy Study. ChemistrySelect 2023. [DOI: 10.1002/slct.202204360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Rishika Aggrawal
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Sayantan Halder
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Shalini Dyagala
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Subit Kumar Saha
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
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2
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Das P, Mandal P, Shit D, Pramanik S. Unraveling the effect of surfactant chain length on the binding interaction of curcumin with cationic and non‐ionic micelles. J SURFACTANTS DETERG 2022. [DOI: 10.1002/jsde.12592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Priyabrata Das
- Department of Chemistry University of Calcutta Kolkata India
| | - Pabitra Mandal
- Department of Chemistry University of Calcutta Kolkata India
| | - Debatri Shit
- Department of Chemistry University of Calcutta Kolkata India
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3
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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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4
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Aggrawal R, Kumari S, Gangopadhyay S, Saha SK. Role of Different States of Solubilized Water on Solvation Dynamics and Rotational Relaxation of Coumarin 490 in Reverse Micelles of Gemini Surfactants, Water/12- s-12.2Br - ( s = 5, 6, 8)/ n-Propanol/Cyclohexane. ACS OMEGA 2020; 5:6738-6753. [PMID: 32258909 PMCID: PMC7114611 DOI: 10.1021/acsomega.0c00035] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 03/04/2020] [Indexed: 06/07/2023]
Abstract
The present study demonstrates how the different states of solubilized water viz. quaternary ammonium headgroup-bound, bulklike, counterion-bound, and free water in reverse micelles of a series of cationic gemini surfactants, water/12-s-12 (s = 5, 6, 8).2Br-/n-propanol/cyclohexane, control the solvation dynamics and rotational relaxation of Coumarin 490 (C-490) and microenvironment of the reverse micelles. The relative number of solubilized water molecules of a given state per surfactant molecule decides major and minor components. A rapid increase in the number of bulklike water molecules per surfactant molecule as compared to the slow increase in the number of each of headgroup- and counterion-bound water molecules per surfactant molecule with increasing water content (W o) in a given reverse micellar system is responsible for the increase in the rate of solvation and rotational relaxation of C-490. The increase in the number of counterion-bound water molecules per surfactant molecule and the concomitant decrease in the number of bulklike water molecules per surfactant molecule with increasing spacer chain length of gemini surfactants at a given W o are ascribed to the slower rates of both solvation and rotational relaxation. Relative abundances of different states of water have a role on the microenvironment of the reverse micelles as well. Thus, a comprehensive effect of different states of water on dynamics in complex biomimicking systems has been presented here.
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Affiliation(s)
- Rishika Aggrawal
- Department
of Chemistry, Birla Institute of Technology
& Science (BITS), Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Sunita Kumari
- Department
of Chemistry, Birla Institute of Technology
& Science (BITS), Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Subhashis Gangopadhyay
- Department
of Physics, Birla Institute of Technology
& Science (BITS), Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Subit Kumar Saha
- Department
of Chemistry, Birla Institute of Technology
& Science (BITS), Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
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5
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Darvin JR, Berg MA. Micelle Heterogeneity from the 2D Kinetics of Solute Rotation. J Phys Chem Lett 2019; 10:6885-6891. [PMID: 31618033 DOI: 10.1021/acs.jpclett.9b02783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The chemical and physical properties of microstructured materials vary with position. The photophysics of solute molecules can measure these local properties, but they often show multiple rates (rate dispersion), which complicates the interpretation. In the case of micelles, rate dispersion in a solute's anisotropy decay has been assigned to either local anisotropy or heterogeneity in the local viscosity. To resolve this conflict, the rotation of PM597 molecules in SDS micelles has been measured by polarized MUPPETS (multiple population-period transient spectroscopy). This 2D technique shows that heterogeneity is strong and that local anisotropy is minimal. The results suggest that on a subnanosecond time scale, the solute sees only one strong fluctuation of the micelle structure. The anisotropic, average structure emerges on longer time scales.
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Affiliation(s)
- Jason R Darvin
- Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Mark A Berg
- Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States
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6
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Lone MS, Chat OA, Vashishtha M, Dar AA. Transition from Competitive to Non-Competitive Solubilization with the Decrease in Number of Oxyethylene (OE) Units of Non-Ionic Surfactants towards Polycyclic Aromatic Hydrocarbons. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180215] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mohd Sajid Lone
- Physical Chemistry Division, Department of Chemistry, University of Kashmir, Srinagar-190006, J&K, India
| | - Oyais Ahmad Chat
- Physical Chemistry Division, Department of Chemistry, University of Kashmir, Srinagar-190006, J&K, India
- Department of Chemistry, Government Degree College, Pulwama-192301, J & K, India
| | - Manu Vashishtha
- Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai 400076, India
| | - Aijaz Ahmad Dar
- Physical Chemistry Division, Department of Chemistry, University of Kashmir, Srinagar-190006, J&K, India
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Kumari S, Sonu, Sundar G, Saha SK. Effect of organic and a Hofmeister series of inorganic counterions on the solvation dynamics and rotational relaxation in aqueous micelles of hexadecyltrimethylammonium surfactants. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Phukon A, Sahu K. How do the interfacial properties of zwitterionic sulfobetaine micelles differ from those of cationic alkyl quaternary ammonium micelles? An excited state proton transfer study. Phys Chem Chem Phys 2017; 19:31461-31468. [DOI: 10.1039/c7cp06339c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The interface of a zwitterionic sulfobetaine micelle is more packed and less hydrated compared to a cationic alkyl-ammonium micelle with an identical alkyl tail.
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
| | - Kalyanasis Sahu
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
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9
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Sonu S, Kumari S, Saha SK. Solvation dynamics and rotational relaxation of coumarin 153 in mixed micelles of Triton X-100 and cationic gemini surfactants: effect of composition and spacer chain length of gemini surfactants. Phys Chem Chem Phys 2016; 18:1551-63. [DOI: 10.1039/c5cp03835a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To demonstrate simultaneously how the solvation dynamics and rotational relaxation in nonionic micelles change with the composition of a gemini surfactant and how this change depends on spacer chain length of gemini surfactants.
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Affiliation(s)
- Sonu Sonu
- Department of Chemistry
- Birla Institute of Technology & Science (BITS)
- Pilani
- India
| | - Sunita Kumari
- Department of Chemistry
- Birla Institute of Technology & Science (BITS)
- Pilani
- India
| | - Subit K. Saha
- Department of Chemistry
- Birla Institute of Technology & Science (BITS)
- Pilani
- India
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10
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Sonu, Kumari S, Saha SK. Effect of Polymethylene Spacer of Cationic Gemini Surfactants on Solvation Dynamics and Rotational Relaxation of Coumarin 153 in Aqueous Micelles. J Phys Chem B 2015; 119:9751-63. [PMID: 26107156 DOI: 10.1021/acs.jpcb.5b03081] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The present work demonstrates the solvation dynamics and rotational relaxation of Coumarin 153 (C-153) in the micelles of a series of cationic gemini surfactants, 12-s-12, 2Br(-) containing a hydrophobic polymethylene spacer with s = 3, 4, 6, 8, 12. Steady-state and time-correlated single-photon counting (TCSPC) fluorescence spectroscopic techniques have been used to carry out this study. Steady-state and TCSPC fluorescence data suggest that C-153 molecules are located at the Stern layer of micelles. While probe molecules feel more or less the same micropolarity in the micellar phase, the microviscosity of micelles decreases with spacer chain length. Solvation dynamics at the Stern layer is bimodal in nature with fast solvation as a major component. Counter ions and water molecules bonded with the polar headgroups of surfactant molecules are responsible for the slow component. Average solvation time increases with spacer chain length because of the increased degree of counter ion dissociation. Some water molecules are involved in the solvation of counter ions themselves, resulting in the decrease in "free" water molecules to be available for the solvation of C-153. The hydrophobic spacer chain also has an effect on increasing the solvation time with increasing chain length. The average rotational relaxation time for C-153 decreases with spacer chain length with a rapid decrease at s > 4. The anisotropy decay of C-153 in micelles is biexponential in nature. The slow rotational relaxation is due to the lateral diffusion of C-153 in micelles. Lateral diffusion is much faster than the rotational motion of a micelle as a whole. The rotational motion of the micelle as a whole becomes faster with the decreasing size of micelles.
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11
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Ghosh S, Kuchlyan J, Roychowdhury S, Banik D, Kundu N, Roy A, Sarkar N. Unique Influence of Cholesterol on Modifying the Aggregation Behavior of Surfactant Assemblies: Investigation of Photophysical and Dynamical Properties of 2,2′-Bipyridine-3,3′-diol, BP(OH)2 in Surfactant Micelles, and Surfactant/Cholesterol Forming Vesicles. J Phys Chem B 2014; 118:9329-40. [PMID: 25036947 DOI: 10.1021/jp503938b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Surajit Ghosh
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Jagannath Kuchlyan
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Subhajit Roychowdhury
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Arpita Roy
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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12
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Chatterjee A, Maity B, Seth D. Photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in cationic micelles: effect of chain length and head group of the surfactants and urea. RSC Adv 2014. [DOI: 10.1039/c4ra02532f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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Baruah A, Chauhan G, Ojha K, Pathak AK. Phase Behavior and Thermodynamic and Rheological Properties of Single- (SDS) and Mixed-Surfactant (SDS + CAPB)-Based Fluids with 3-Methylbutan-1-ol as the Cosurfactant and Pine Oil as the Organic Phase. Ind Eng Chem Res 2014. [DOI: 10.1021/ie500987y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Atrayee Baruah
- Department of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Geetanjali Chauhan
- Department of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Keka Ojha
- Department of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - A. K. Pathak
- Department of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
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14
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Tiwari AK, Sonu, Saha SK. Effect of Hydroxyl Group Substituted Spacer Group of Cationic Gemini Surfactants on Solvation Dynamics and Rotational Relaxation of Coumarin-480 in Aqueous Micelles. J Phys Chem B 2014; 118:3582-92. [DOI: 10.1021/jp4069703] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Amit K. Tiwari
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
| | - Sonu
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
| | - Subit K. Saha
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
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15
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Koniari A, Avranas A. Adsorption of cationic surfactants on covered hanging mercury drop electrode surface of variable area. J Colloid Interface Sci 2012; 382:82-9. [PMID: 22748427 DOI: 10.1016/j.jcis.2012.05.047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 05/02/2012] [Accepted: 05/27/2012] [Indexed: 10/28/2022]
Abstract
Cetyldimethylbenzylammonium chloride (CDBACl) or cetyltrimethylammonium bromide (CTAB) is preadsorbed on mercury and used as substrate. The adsorptive stripping voltammetry with the two-step procedure is used. The mercury droplet with the preadsorbed surfactant is expanded in aqueous solutions of KCl, KBr, CTAB, CDBACl, or cetylethyldimethylammonium bromide (CEDAB). The surface area was increased from 0.0022cm(2) up to 0.0571cm(2). The surfactant molecules are maintained close to each other and in the vicinity of the electrode by the applied electric field. The expanding of the droplets resulted in a reorientation of the adsorbed molecules depending on the surfactant surface concentration. In some cases, condensed films were observed. Differences were noticed in the adsorption and desorption potential region. A linear increase in the capacitance current with the surface area was found in all cases up to a maximum increase in the surface area. Partly disorganized films were also observed. In some cases, defects were noticed during expansion. In one case, fractal structure was observed.
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Affiliation(s)
- Argyri Koniari
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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16
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Dhenadhayalan N, Selvaraju C, Ramamurthy P. Photoionization and Time-Dependent Stokes Shift of Coumarin 307 in Soft Matter: Solvation and Radical-Ion Pair Recombination Dynamics. J Phys Chem B 2011; 115:10892-902. [DOI: 10.1021/jp203092c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Chellappan Selvaraju
- National Centre for Ultrafast Processes, University of Madras, Chennai- 600 113, India
| | - Perumal Ramamurthy
- National Centre for Ultrafast Processes, University of Madras, Chennai- 600 113, India
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17
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Electrostatic Pushing Effect: A Prospective Strategy for Enhanced Drug Delivery. J Phys Chem B 2010; 114:12541-8. [DOI: 10.1021/jp1049099] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Mallick A. Rotational relaxation dynamics of a β-carboline analogue in cyclodextrin nanocavity: How does the cavity size barricade the molecular rotation? J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.06.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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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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20
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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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21
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Satpati AK, Kumbhakar M, Nath S, Pal H. Photoinduced electron transfer between quinones and amines in micellar media: Tuning the Marcus inversion region. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Chakrabarty A, Das P, Mallick A, Chattopadhyay N. Effect of Surfactant Chain Length on the Binding Interaction of a Biological Photosensitizer with Cationic Micelles. J Phys Chem B 2008; 112:3684-92. [DOI: 10.1021/jp709818d] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alok Chakrabarty
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India, and Division of Frontier Material Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Paramita Das
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India, and Division of Frontier Material Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Arabinda Mallick
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India, and Division of Frontier Material Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - Nitin Chattopadhyay
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India, and Division of Frontier Material Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
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Das P, Chakrabarty A, Mallick A, Chattopadhyay N. Photophysics of a Cationic Biological Photosensitizer in Anionic Micellar Environments: Combined Effect of Polarity and Rigidity. J Phys Chem B 2007; 111:11169-76. [PMID: 17784745 DOI: 10.1021/jp073984o] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A steady-state and time-resolved photophysical study of a cationic phenazinium dye, phenosafranin (PSF), has been investigated in well-characterized biomimetic micellar nanocavities formed by anionic surfactants of varying chain lengths, namely, sodium decyl sulfate (S(10)S), sodium dodecyl sulfate (S(12)S), and sodium tetradecyl sulfate (S(14)S). In all these micellar environments, the charge transfer fluorescence of PSF shows a large hypsochromic shift along with an enhancement in the fluorescence quantum yield as compared to that in aqueous medium. A reduction in the nonradiative deactivation rate within the hydrophobic interior of micelles led to an increase in the fluorescence yield and lifetime. The present work shows the degree of accessibility of the fluorophore toward the ionic quencher in the presence of surfactants of different surfactant chain lengths. The fluorometric and fluorescence quenching studies suggest that the fluorophore resides at the micelle-water interfacial region. The enhancements in the fluorescence anisotropy and rotational relaxation time of the probe in all the micellar environments from the pure aqueous solution suggest that the fluorophore binds in motionally restricted regions introduced by the micelles. Polarity and viscosity of the microenvironments around the probe in the micellar systems have been determined. The work has paid proper attention to the hydrophobic effect of the surfactant chain length on photophysical observations.
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Affiliation(s)
- Paramita Das
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India
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Chakrabarty A, Mallick A, Haldar B, Purkayastha P, Das P, Chattopadhyay N. Surfactant chain-length-dependent modulation of the prototropic transformation of a biological photosensitizer: norharmane in anionic micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:4842-8. [PMID: 17373835 DOI: 10.1021/la0700063] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A photophysical study of norharmane (NHM), an efficient cancer cell photosensitizer, has been undertaken in well-characterized biomimetic micellar nanocavities formed by anionic surfactants of varying chain length, namely, sodium decyl sulfate (S10S), sodium dodecyl sulfate (S12S), and sodium tetradecyl sulfate (S14S), using steady-state and time-resolved fluorescence spectroscopy. The effect of the hydrophobic chain length on the structural dynamism of the fluorophore has been reported. Experimental results demonstrate that the equilibrium of this dynamism is sensitive to the environment. Variation in the surfactant chain length plays an important role in promoting a specific prototropic form of the probe molecule. A striking feature of the present study is that an increase in the surfactant chain length (hydrophobicity) favors the cationic species of NHM. This has been rationalized on the basis of changes in the local pH and the aggregation number of the micelles. A fluorescence quenching study of the micelle-bound probe using ionic quencher Cu2+ corroborates this.
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Affiliation(s)
- Alok Chakrabarty
- Department of Chemistry, Jadavpur University, Calcutta 700 032, India
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25
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Seth D, Chakraborty A, Setua P, Sarkar N. Dynamics of Solvent and Rotational Relaxation of Coumarin-153 in Room-Temperature Ionic Liquid 1-Butyl-3-methyl Imidazolium Tetrafluoroborate Confined in Poly(oxyethylene glycol) Ethers Containing Micelles. J Phys Chem B 2007; 111:4781-7. [PMID: 17417894 DOI: 10.1021/jp067122j] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have investigated solvent and rotational relaxation of coumarin 153 (C-153) in room-temperature ionic liquid (RTILs) 1-butyl-3-methyl-imidazolium tetrafluoroborate ([bmim][BF(4)]) and the ionic liquid confined in alkyl poly(oxyethylene glycol) ethers containing micelles. We have used octaethylene glycol monotetradecyl ether (C(14)E(8)) and octaethylene glycol monododecyl ether (C(12)E(8)) as surfactants. In the [bmim][BF(4)]-C(14)E(8) micelle, we have observed only a 22% increase in solvation time compared to neat [bmim][BF(4)], whereas in the [bmim][BF(4)]-C(12)E(8) system, we have observed approximately 57% increase in average solvation time due to micelle formation. However, the slowing down in solvation time on going from neat RTIL to RTIL-confined micelles is much smaller compared to that on going from water to water confined micellar aggregates. The 22-57% increase in solvation time is attributed to the slowing down of collective motions of cations and anions in micelles. The rotational relaxation times become faster in both the micelles compare to neat [bmim][BF(4)].
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Affiliation(s)
- Debabrata Seth
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Das P, Mallick A, Chakrabarty A, Haldar B, Chattopadhyay N. Effect of nanocavity confinement on the rotational relaxation dynamics: 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine in micelles. J Chem Phys 2006; 125:44516. [PMID: 16942165 DOI: 10.1063/1.2219751] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In continuation of our recent study on the steady state photophysics of a biologically active beta-carboline derivative, 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ), in the present article we have investigated the effect of nanocavity confinement on the excited state dynamics and rotational relaxation of the probe using picosecond time resolved fluorescence and fluorescence anisotropy techniques. The polarity dependent intramolecular charge transfer process is responsible for the remarkable sensitivity of this biological fluorophore in micellar environments. The fluorescence anisotropy decay of AODIQ incorporated inside the micelle is biexponential. The rotational motion of the probe was interpreted on the basis of a two step model consisting of a fast restricted rotation of the probe and a slow lateral diffusion of the probe in the micelle; both coupled to the overall rotation of the micelle. Experimental results reveal that micellar environment causes significant retardation of both the wobbling as well as the translational motion of the probe.
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Affiliation(s)
- Paramita Das
- Department of Chemistry, Jadavpur University, Calcutta 700032, India
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Chakraborty A, Seth D, Setua P, Sarkar N. Dynamics of Solvent and Rotational Relaxation of Glycerol in the Nanocavity of Reverse Micelles. J Phys Chem B 2006; 110:5359-66. [PMID: 16539469 DOI: 10.1021/jp056650c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The dynamics of solvent and rotational relaxation of Coumarin 480 and Coumarin 490 in glycerol containing bis-2-ethyl hexyl sulfosuccinate sodium salt (AOT) reverse micelles have been investigated with steady-state and time-resolved fluorescence spectroscopy. We observed slower solvent relaxation of glycerol confined in the nanocavity of AOT reverse micelles compared to that in pure glycerol. However, the slowing down in the solvation time on going from neat glycerol to glycerol confined reverse micelles is not comparable to that on going from pure water or acetonitrile to water or acetonitrile confined AOT reverse micellar aggregates. While solvent relaxation times were found to decrease with increasing glycerol content in the reverse micellar pool, rotational relaxation times were found to increase with increase in glycerol content.
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Affiliation(s)
- Anjan Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Chakraborty A, Seth D, Setua P, Sarkar N. Photoinduced electron transfer from N,N-dimethylaniline to 7-amino Coumarins in protein-surfactant complex: Slowing down of electron transfer dynamics compared to micelles. J Chem Phys 2006; 124:74512. [PMID: 16497062 DOI: 10.1063/1.2170081] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photoinduced electron transfer from N,N-dimethylaniline to different Coumarin dyes has been investigated in dodecyl trimethyl ammonium bromide (DTAB) micelles and in Bovine serum albumin (BSA)-DTAB protein-surfactant complex using steady-state and picosecond time-resolved fluorescence spectroscopy. We observed a slower fluorescence quenching rate in the DTAB micelles and in the protein-surfactant complex as compared to that in pure acetonitrile solution. Moreover, the observed fluorescence quenching in BSA-DTAB complex was found to be slower than that in DTAB micelles. In the correlation of free-energy change with the fluorescence quenching constant we observed a deviation in the fluorescence quenching electron transfer rate for Coumarin 151 (C-151) from the normal Marcus curve. This observation is ascribed to the stronger interaction of C-151 with the surfactant molecules present in the micelles. This is evident from the slower translation diffusion (D(L)) of Coumarin 151 compared to other probe molecules.
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Affiliation(s)
- Anjan Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal
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Humpolícková J, Stepánek M, Procházka K, Hof M. Solvent Relaxation Study of pH-Dependent Hydration of Poly(oxyethylene) Shells in Polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylene) Micelles in Aqueous Solutions. J Phys Chem A 2005; 109:10803-12. [PMID: 16331923 DOI: 10.1021/jp053348v] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The hydration of the poly(oxyethylene) shell in polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylene) micelles was investigated by monitoring the solvent relaxation response of a solvent-sensitive fluorophore (patman). It has been found that the relaxation occurs on the nanosecond time scale. Results for triblock copolymer micelles have been compared with those obtained for polystyrene-block-poly(2-vinylpyridine) micelles in order to evaluate the effect of the outer polyoxyethylene layer. Considerable pH-dependent changes in the hydration of poly(oxyethylene) units at the poly(2-vinylpyridine)/polyoxyethylene interface were observed. Additionally, the paper shows that the solvent relaxation technique is a suitable tool for studying polymeric nanoparticles and that the measurement of time-dependent half-width of the emission spectrum allows for estimation of the extent of relaxation process observed by a given experimental setup.
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Affiliation(s)
- Jana Humpolícková
- Department of Physical and Macromolecular Chemistry and Laboratory of Specialty Polymers, School of Science, Charles University in Prague, Albertov 2030, 128 40 Prague 2, Czech Republic
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