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Ghosh G, Roy DS, Ghosh R, Mukherjee D, Biswas S, Roy L, Chattopadhyay A, Das R, Pal SK. Excited-State Dynamics of a Photoacid: A Potential Probe for Recognizing Transition from Lamellar to Nonlamellar Inverted Structures of Liposome based Nanocarriers. Chemphyschem 2024; 25:e202300635. [PMID: 37936318 DOI: 10.1002/cphc.202300635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/04/2023] [Accepted: 11/07/2023] [Indexed: 11/09/2023]
Abstract
Liposomes of a cationic lipid dioctadecyldimethylammonium bromide (DODAB) are efficient nanocarriers of nucleic acids. Incorporation of a neutral lipid monoolein (MO) in excess (xMO >0.5) changes the lamellar organization of DODAB liposomes into non-lamellar inverted structures of DODAB/MO liposomes facilitating nucleic acid delivery to cells. Photoexcitation of 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS), a photoacid, initiates an excited state proton transfer (ESPT) reaction in its protonated form (ROH*) generating the deprotonated anionic form (RO- *). The fluorescence intensity ratio (IROH* /IRO-* ) of these two forms is governed by the ESPT dynamics, and increases with increasing MO content (xMO ) in the cationic liposomes of DODAB. Transition from lamellar organization of DODAB liposomes into non-lamellar inverted structures of DODAB/MO liposomes, due to incorporation of MO (xMO ~0.7), is manifested by a significant increase of ESPT time (τPT ) and the time constant of wobbling motion (τW ) of HPTS. Thus, the lamellar organizations of DODAB or DODAB-rich (xMO 0.2) liposomes and the non-lamellar organizations of MO-rich (xMO ~0.7) liposomes are recognized by significantly different excited state dynamics of the photoacid.
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Affiliation(s)
- Gourab Ghosh
- Dept. of Chemistry, West Bengal State University, Barasat, Kolkata, 700126, India
| | - Debanjana Singha Roy
- Dept. of Chemistry, West Bengal State University, Barasat, Kolkata, 700126, India
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, India
| | - Ria Ghosh
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Kolkata, India
| | - Dipanjan Mukherjee
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, India
| | - Suman Biswas
- Dept. of Chemistry, West Bengal State University, Barasat, Kolkata, 700126, India
| | - Lopamudra Roy
- Department of Applied Optics and Photonics, University of Calcutta, 92, Acharya Prafulla Chandra Rd, Kolkata, 700009, India
| | - Arpita Chattopadhyay
- Department of Basic science and humanities, Techno International New Town, Rajarhat, Kolkata, 700156
| | - Ranjan Das
- Dept. of Chemistry, West Bengal State University, Barasat, Kolkata, 700126, India
| | - Samir Kumar Pal
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, India
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Sarkar N, Levinger NE, Datta A. Tribute to Professor Kankan Bhattacharyya. J Phys Chem B 2022; 126:3461-3463. [PMID: 35586923 DOI: 10.1021/acs.jpcb.2c02491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India
| | - Nancy E Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Anindya Datta
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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Pal T, Sahu K. Photophysical characterization of a sub-micellar triblock copolymer-cationic surfactant aggregate for nanostructure synthesis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY 2021. [DOI: 10.1016/j.jpap.2021.100066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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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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Pal T, Sahu K. Anomalous Variation of Excited-State Proton Transfer Dynamics inside a Triblock Copolymer–Cationic Surfactant Mixed Micelle. J Phys Chem B 2019; 123:8559-8568. [DOI: 10.1021/acs.jpcb.9b06575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Tapas Pal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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Das I, Halder M. A Global Scenario on the Dynamics of Excited State Proton Transfer of Pyranine in the Mixed Micellar Assemblies: Role of Water Accessibility in the Probe Location+. ChemistrySelect 2018. [DOI: 10.1002/slct.201800361] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ishita Das
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 INDIA
| | - Mintu Halder
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 INDIA
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Alarcos N, Cohen B, Ziółek M, Douhal A. Photochemistry and Photophysics in Silica-Based Materials: Ultrafast and Single Molecule Spectroscopy Observation. Chem Rev 2017; 117:13639-13720. [PMID: 29068670 DOI: 10.1021/acs.chemrev.7b00422] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Silica-based materials (SBMs) are widely used in catalysis, photonics, and drug delivery. Their pores and cavities act as hosts of diverse guests ranging from classical dyes to drugs and quantum dots, allowing changes in the photochemical behavior of the confined guests. The heterogeneity of the guest populations as well as the confinement provided by these hosts affect the behavior of the formed hybrid materials. As a consequence, the observed reaction dynamics becomes significantly different and complex. Studying their photobehavior requires advanced laser-based spectroscopy and microscopy techniques as well as computational methods. Thanks to the development of ultrafast (spectroscopy and imaging) tools, we are witnessing an increasing interest of the scientific community to explore the intimate photobehavior of these composites. Here, we review the recent theoretical and ultrafast experimental studies of their photodynamics and discuss the results in comparison to those in homogeneous media. The discussion of the confined dynamics includes solvation and intra- and intermolecular proton-, electron-, and energy transfer events of the guest within the SBMs. Several examples of applications in photocatalysis, (photo)sensors, photonics, photovoltaics, and drug delivery demonstrate the vast potential of the SBMs in modern science and technology.
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Affiliation(s)
- Noemí Alarcos
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Boiko Cohen
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Marcin Ziółek
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University , Umultowska 85, 61-614 Poznań, Poland
| | - Abderrazzak Douhal
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
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Das I, Panja S, Halder M. Modulation and Salt-Induced Reverse Modulation of the Excited-State Proton-Transfer Process of Lysozymized Pyranine: The Contrasting Scenario of the Ground-State Acid–Base Equilibrium of the Photoacid. J Phys Chem B 2016; 120:7076-87. [DOI: 10.1021/acs.jpcb.6b04111] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ishita Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Sudipta Panja
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Mintu Halder
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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Alarcos N, Cohen B, Douhal A. A slowing down of proton motion from HPTS to water adsorbed on the MCM-41 surface. Phys Chem Chem Phys 2016; 18:2658-71. [PMID: 26705542 DOI: 10.1039/c5cp04548g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report on the steady-state and femtosecond-nanosecond (fs-ns) behaviour of 8-hydroxypyrene-1,3,6-trisulfonate (pyranine, HPTS) and its interaction with mesoporous silica based materials (MCM-41) in both solid-state and dichloromethane (DCM) suspensions in the absence and presence of water. In the absence of water, HPTS forms aggregates which are characterized by a broad emission spectrum and multiexponential behavior (τsolid-state/DCM = 120 ps, 600 ps, 2.2 ns). Upon interaction with MCM41, the aggregate population is found to be lower, leading to the formation of adsorbed monomers. In the presence of water (1%), HPTS with and without MCM41 materials in DCM suspensions undergoes an excited-state intermolecular proton-transfer (ESPT) reaction in the protonated form (ROH*) producing a deprotonated species (RO(-)*). The long-time emission decays of the ROH* in different systems in the presence of water are multiexponential, and are analysed using the diffusion-assisted geminate recombination model. The obtained proton-transfer and recombination rate constants for HPTS and HPTS/MCM41 complexes in DCM suspensions in the presence of water are kPT = 13 ns(-1), krec = 7.5 Å ns(-1), and kPT = 5.4 ns(-1), krec = 2.2 Å ns(-1), respectively, The slowing down of both processes in the latter case is explained in terms of specific interactions of the dye and of the water molecules with the silica surface. The ultrafast dynamics (fs-regime) of the HPTS/MCM41 complexes in DCM suspensions, without and with water, shows two components which are assigned to intramolecular vibrational-energy relaxation (IVR) (∼120 fs vs. ∼0.8 ps), and vibrational relaxation/cooling (VC), and charge transfer (CT) processes (∼2 ps without water and ∼5 ps with water) of the adsorbed ROH*. Our results provide new knowledge on the interactions and the proton-transfer reaction dynamics of HPTS adsorbed on mesoporous materials.
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Affiliation(s)
- Noemí Alarcos
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
| | - Boiko Cohen
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
| | - Abderrazzak Douhal
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
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Singh V, Khullar P, Dave PN, Kaura A, Bakshi MS, Kaur G. pH and thermo-responsive tetronic micelles for the synthesis of gold nanoparticles: effect of physiochemical aspects of tetronics. Phys Chem Chem Phys 2014; 16:4728-39. [DOI: 10.1039/c3cp55079f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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11
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Sen Mojumdar S, Chowdhury R, Mandal AK, Bhattacharyya K. In what time scale proton transfer takes place in a live CHO cell? J Chem Phys 2013; 138:215102. [PMID: 23758398 DOI: 10.1063/1.4807862] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Supratik Sen Mojumdar
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Khullar P, Singh V, Mahal A, Kumar H, Kaur G, Bakshi MS. Block Copolymer Micelles as Nanoreactors for Self-Assembled Morphologies of Gold Nanoparticles. J Phys Chem B 2013; 117:3028-39. [DOI: 10.1021/jp310507m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Poonam Khullar
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
| | - Vijender Singh
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
| | - Aabroo Mahal
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
- Department of Chemistry, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar-144011, India
| | - Harsh Kumar
- Department of Chemistry, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar-144011, India
| | - Gurinder Kaur
- Nanotechnology Research Laboratory, College of North Atlantic, Labrador City, NL A2 V
2K7 Canada
| | - Mandeep Singh Bakshi
- Department of Chemistry, Wilfrid Laurier University, Science Building, 75 University
Ave. W., Waterloo ON N2L 3C5, Canada
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13
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Dynamics and prototropic reactivity of electronically excited states in simple surfactant aggregates. Curr Opin Colloid Interface Sci 2013. [DOI: 10.1016/j.cocis.2012.12.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Mandal AK, Ghosh S, Das AK, Mondal T, Bhattacharyya K. Effect of NaCl on ESPT‐Mediated FRET in a CTAC Micelle: A Femtosecond and FCS Study. Chemphyschem 2012; 14:788-96. [PMID: 23143825 DOI: 10.1002/cphc.201200669] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Indexed: 02/01/2023]
Affiliation(s)
- Amit Kumar Mandal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India), Fax: (+91) 33‐2473‐2805
| | - Shirsendu Ghosh
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India), Fax: (+91) 33‐2473‐2805
| | - Atanu Kumar Das
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India), Fax: (+91) 33‐2473‐2805
| | - Tridib Mondal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India), Fax: (+91) 33‐2473‐2805
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India), Fax: (+91) 33‐2473‐2805
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Sedgwick M, Cole RL, Rithner CD, Crans DC, Levinger NE. Correlating Proton Transfer Dynamics To Probe Location in Confined Environments. J Am Chem Soc 2012; 134:11904-7. [DOI: 10.1021/ja304529v] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Myles Sedgwick
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United
States
| | - Richard L. Cole
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United
States
| | - Christopher D. Rithner
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United
States
| | - Debbie C. Crans
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United
States
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United
States
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Mondal T, Ghosh S, Das AK, Mandal AK, Bhattacharyya K. Salt Effect on the Ultrafast Proton Transfer in Niosome. J Phys Chem B 2012; 116:8105-12. [DOI: 10.1021/jp3043957] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Tridib Mondal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata 700032, India
| | - Shirsendu Ghosh
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata 700032, India
| | - Atanu Kumar Das
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata 700032, India
| | - Amit Kumar Mandal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata 700032, India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur,
Kolkata 700032, India
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Cohen B, Martin Álvarez C, Alarcos Carmona N, Organero JA, Douhal A. Proton-Transfer Reaction Dynamics within the Human Serum Albumin Protein. J Phys Chem B 2011; 115:7637-47. [DOI: 10.1021/jp200294q] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Boiko Cohen
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Cristina Martin Álvarez
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Noemí Alarcos Carmona
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Juan Angel Organero
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Abderrazzak Douhal
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
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Liang J, Lu Z, Xu J, Li J, Zhang H, Yang W. Incorporating anionic dyes into silicananoparticles by using a cationic polyelectrolyte as a bridge. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02946g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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19
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Mondal T, Das AK, Sasmal DK, Bhattacharyya K. Excited State Proton Transfer in Ionic Liquid Mixed Micelles. J Phys Chem B 2010; 114:13136-42. [DOI: 10.1021/jp1058758] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tridib Mondal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Atanu Kumar Das
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Dibyendu Kumar Sasmal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Khullar P, Mahal A, Singh V, Banipal TS, Kaur G, Bakshi MS. How PEO-PPO-PEO triblock polymer micelles control the synthesis of gold nanoparticles: temperature and hydrophobic effects. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11363-11371. [PMID: 20369849 DOI: 10.1021/la100734p] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Aqueous micellar solutions of F68 (PEO(78)-PPO(30)-PEO(78)) and P103 (PEO(17)-PPO(60)-PEO(17)) triblock polymers were used to synthesize gold (Au) nanoparticles (NPs) at different temperatures. All reactions were monitored with respect to reaction time and temperature by using UV-visible studies to understand the growth kinetics of NPs and the influence of different micellar states on the synthesis of NPs. The shape, size, and locations of NPs in the micellar assemblies were determined with the help of TEM, SEM, and EDS analyses. The results explained that all reactions were carried out with the PEO-PPO-PEO micellar surface cavities present at the micelle-solution interface and were precisely controlled by the micellar assemblies. Marked differences were detected when predominantly hydrophilic F68 and hydrophobic P103 micelles were employed to conduct the reactions. The UV-visible results demonstrated that the reduction of gold ions into nucleating centers was channeled through the ligand-metal charge-transfer complex (LMCT) and carried out by the surface cavities. Excessive hydration of the surface cavities in the case of F68 micelles produced a few small NPs, but their yield and size increased as the micelles were dehydrated under the effect of increasing temperature. The results concluded that the presence of well-defined predominantly hydrophobic micelles with a compact micelle-solution interfacial arrangement of surface cavities ultimately controlled the reaction.
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Affiliation(s)
- Poonam Khullar
- Department of Chemistry, BBK DAV College for Women, Amritsar 143005, Punjab, India
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Sen Mojumdar S, Mondal T, Das AK, Dey S, Bhattacharyya K. Ultrafast and ultraslow proton transfer of pyranine in an ionic liquid microemulsion. J Chem Phys 2010; 132:194505. [DOI: 10.1063/1.3428669] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Freitas AA, Quina FH, Fernandes AC, Maçanita AAL. Picosecond Dynamics of the Prototropic Reactions of 7-Hydroxyflavylium Photoacids Anchored at an Anionic Micellar Surface. J Phys Chem A 2010; 114:4188-96. [DOI: 10.1021/jp100281u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adilson A. Freitas
- Departamento Engenharia Química, Centro de Química Estrutural, IST/UTL, Lisbon 1049-001, Portugal, Instituto de Química, Universidade de São Paulo, CP 26077, São Paulo 05513-970, Brazil
| | - Frank H. Quina
- Departamento Engenharia Química, Centro de Química Estrutural, IST/UTL, Lisbon 1049-001, Portugal, Instituto de Química, Universidade de São Paulo, CP 26077, São Paulo 05513-970, Brazil
| | - Ana C. Fernandes
- Departamento Engenharia Química, Centro de Química Estrutural, IST/UTL, Lisbon 1049-001, Portugal, Instituto de Química, Universidade de São Paulo, CP 26077, São Paulo 05513-970, Brazil
| | - António A. L. Maçanita
- Departamento Engenharia Química, Centro de Química Estrutural, IST/UTL, Lisbon 1049-001, Portugal, Instituto de Química, Universidade de São Paulo, CP 26077, São Paulo 05513-970, Brazil
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Sathish RS, Kostov Y, Rao G. Spectral resolution of molecular ensembles under ambient conditions using surface plasmon coupled fluorescence emission. APPLIED OPTICS 2009; 48:5348-5353. [PMID: 19798374 DOI: 10.1364/ao.48.005348] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the ability to spectrally resolve excited-state ensembles of pyranine (Py) utilizing nanometer-thick metal films as a low-cost analytical tool. Surface plasmon coupling allows to mitigate the effect of spectral broadening that is responsible for blurring the emission spectrum at room temperature, a situation common in conventional fluorescence spectroscopy. The approach is especially useful in the case when several excited-state species are present. Fluorescence emission from closely located protonated, deprotonated, and excimer species of Py couple into surface plasmons and are easily separated and observed with 11-14 fold intensity enhancements. Furthermore, the ultranarrowband photon-sorting of emission from microenvironments in a multispecies system is performed in this study using instruments that are readily available in most laboratories without employing any deconvolution procedure and/or additional dispersive optics.
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Affiliation(s)
- Ramamurthy Sai Sathish
- Center for Advanced Sensor Technology and Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore 21250, Maryland, USA
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Mukhopadhyay M, Mandal A, Misra R, Banerjee D, Bhattacharyya SP, Mukherjee S. Nanopools Governing Proton Transfer in Diametrical Ways in the Ground and Excited State. J Phys Chem B 2008; 113:567-73. [DOI: 10.1021/jp804103h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Madhuri Mukhopadhyay
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
| | - Abhijit Mandal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
| | - Ramprasad Misra
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
| | - Debi Banerjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
| | - Shankar Prasad Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
| | - Samaresh Mukherjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, India, and Department of Physics, Shibpur Dinabandhu Institution (College), Shibpur, Howrah, India
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25
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