1
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Park S, Lee M, Hong S, Jeong Y, Kim D, Choi N, Nam J, Baik H, Choi J. Low-temperature ozone treatment for p-xylene perm-selective MFI type zeolite membranes: Unprecedented revelation of performance-negating cracks larger than 10 nm in polycrystalline membrane structures. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2
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Kumar V. 2-Naphthoic acid prototropism within ionic liquid based media. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Layek S, Banerjee P, Sarkar N. An insight into the dissolution of cellulose in 1-butyl-3-methylimidazolium chloride-DMSO binary Mixture: Exploring the dynamics of rhodamine 6G and fluorescein. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116817] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Lee M, Perry SL, Hayward RC. Complex Coacervation of Polymerized Ionic Liquids in Non-aqueous Solvents. ACS POLYMERS AU 2021; 1:100-106. [PMID: 36855425 PMCID: PMC9954202 DOI: 10.1021/acspolymersau.1c00017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oppositely charged polymerized ionic liquids (PILs) were used to form complex coacervates in two different organic solvents, 2,2,2-trifluoroethanol (TFE) and hexafluoro-2-propanol (HFIP), and the corresponding phase diagrams were constructed using UV-vis, NMR, and turbidity experiments. While previous studies on complex coacervates have focused almost exclusively on aqueous environments, the use of PILs in the current work enabled studies in solvents with substantially lower dielectric constants (27.0 for TFE, 16.7 for HFIP). The critical salt concentration required to induce complete miscibility was roughly 2-fold larger in HFIP compared with TFE, and two different PIL complexes, solidlike precipitates and liquidlike coacervates, were found in both systems. This study provides insight into the effects of low-dielectric-constant solvents on complex coacervation, which has not been widely studied because of the limited solubility of conventional polyelectrolytes in these media.
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Affiliation(s)
- Minjung Lee
- Department
of Polymer Science and Engineering, University
of Massachusetts, Amherst, 120 Governors Drive, Amherst, Massachusetts 01003-9263, United States
| | - Sarah L. Perry
- Department
of Chemical Engineering, University of Massachusetts,
Amherst, 686 North Pleasant
Street, Amherst, Massachusetts 01003-9303, United States
| | - Ryan C. Hayward
- Department
of Polymer Science and Engineering, University
of Massachusetts, Amherst, 120 Governors Drive, Amherst, Massachusetts 01003-9263, United States,Department
of Chemical and Biological Engineering, University of Colorado Boulder, 596
UCB, Boulder, Colorado 80309, United States,
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5
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Hong S, Kim D, Richter H, Moon JH, Choi N, Nam J, Choi J. Quantitative elucidation of the elusive role of defects in polycrystalline MFI zeolite membranes on xylene separation performance. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2018.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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6
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Su F, Guo R, Yu Z, Li J, Liang Z, Shi K, Ma S, Sun G, Li H. Layered rare-earth hydroxide (LRH, R = Tb, Y) composites with fluorescein: delamination, tunable luminescence and application in chemosensoring for detecting Fe(iii) ions. Dalton Trans 2018; 47:5380-5389. [PMID: 29589632 DOI: 10.1039/c8dt00409a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We demonstrate a novel example of tunable luminescence and the application of the delaminated FLN/OS-LRH composites (LRHs are layered rare-earth hydroxides, R = Tb, Y; FLN is the fluorescein named 2-(6-hydroxy-3-oxo-(3H)-xanthen-9-yl)benzoic acid; OS is the anionic surfactant 1-octane sulfonic acid sodium) in detecting Fe(iii) ions. The FLNxOS1-x species (x = 0.02, 0.05, 0.10, and 0.20) are intercalated into the LTbyY1-yH layers (y = 1, 0.9, 0.7, 0.5, 0.3, 0.1 and 0) by ion exchange reactions to yield the composites FLNxOS1-x-LTbyY1-yH. In the solid state, the LYH composites display green emission (564 nm) arising from the organic FLN, while in LTbH composites, the luminescence of the Tb3+ in the layers (545 nm) and the FLN in the interlayers is co-quenched. In the delaminated state in formamide (FM), FLNxOS1-x-LTbH composites display green to yellowish-green luminescence (540-574 nm) following the increasing FLN/OS ratio; while the FLN0.02OS0.98-LTbyY1-yH composites show green emission at ∼540 nm. The fluorescence lifetimes of the composites (4.22-4.63 ns) are comparable to the free FLN-Na, and the quantum yields (31.62-78.70%) of the composites especially that (78.70%) of the FLN0.02OS0.98-LYH are much higher than that (28.40%) of free FLN-Na. The recognition ability of the FLN0.02OS0.98-LYH composite for metal cations is researched. The delaminated FLN0.02OS0.98-LYH colloidal suspension exhibits high selectivity for Fe3+ over other ions (Mg2+, Al3+, Ni2+, Co2+, Cu2+, Zn2+, Mn2+, Pb2+, and Cd2+) with fluorescence quenching, which can work as a kind of turn-off fluorescence sensor for the detection of Fe3+. The detection limit of Fe3+ is determined to be 2.58 × 10-8 M and the quenching constant (Ksv) is 1.70 × 103 M-1. This is the first work on LRH materials working as a chemosensor for recognising metal cations. It provides a new approach for the design of LRH materials to be applied in fluorescence chemosensing.
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Affiliation(s)
- Feifei Su
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
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7
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Bodoki AE, Iacob BC, Gliga LE, Oprean SL, Spivak DA, Gariano NA, Bodoki E. Improved Enantioselectivity for Atenolol Employing Pivot Based Molecular Imprinting. Molecules 2018; 23:E1875. [PMID: 30060464 PMCID: PMC6222315 DOI: 10.3390/molecules23081875] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Revised: 07/20/2018] [Accepted: 07/26/2018] [Indexed: 01/18/2023] Open
Abstract
In the last few decades, molecular imprinting technology went through a spectacular evolution becoming a well-established tool for the synthesis of highly selective biomimetic molecular recognition platforms. Nevertheless, there is still room for advancement in the molecular imprinting of highly polar chiral compounds. The aim of the present work was to investigate the favorable kosmotropic effect of a ternary complex involving a polar chiral template (eutomer of atenolol) and a functional monomer, bridged by a central metal ion through well-defined, spatially directional coordinate bonds. The efficiency of the chiral molecular recognition was systematically assessed on polymers obtained both by non-covalent and metal-mediated molecular imprinting. The influence on the chromatographic retention and enantioselectivity of different experimental variables (functional monomers, cross-linkers, chaotropic agents, metal ions, porogenic systems, etc.) were studied on both slurry packed and monolithic HPLC columns. Deliberate changes in the imprinting and rebinding (chromatographic) processes, along with additional thermodynamic studies shed light on the particularities of the molecular recognition mechanism. The best performing polymer in terms of enantioselectivity (α = 1.60) was achieved using 4-vinyl pyridine as functional monomer and secondary ligand for the Co(II)-mediated imprinting of S-atenolol in the presence of EDMA as cross-linker in a porogenic mixture of [BMIM][BF₄]:DMF:DMSO = 10:1:5, v/v/v.
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Affiliation(s)
- Andreea Elena Bodoki
- Department of Inorganic Chemistry, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 12 Ion Creangă St., Cluj-Napoca 400010, Romania.
| | - Bogdan-Cezar Iacob
- Department of Analytical Chemistry, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 4 Pasteur St., Cluj-Napoca 400349, Romania.
| | - Laura Elena Gliga
- Department of Analytical Chemistry, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 4 Pasteur St., Cluj-Napoca 400349, Romania.
| | - Simona Luminita Oprean
- Department of Inorganic Chemistry, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 12 Ion Creangă St., Cluj-Napoca 400010, Romania.
| | - David A Spivak
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Nicholas A Gariano
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Ede Bodoki
- Department of Analytical Chemistry, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 4 Pasteur St., Cluj-Napoca 400349, Romania.
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8
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Lifetime and Fluorescence Quantum Yield of Two Fluorescein-Amino Acid-Based Compounds in Different Organic Solvents and Gold Colloidal Suspensions. CHEMOSENSORS 2018. [DOI: 10.3390/chemosensors6030026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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9
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Ji X, Wu RT, Long L, Guo C, Khashab NM, Huang F, Sessler JL. Physical Removal of Anions from Aqueous Media by Means of a Macrocycle-Containing Polymeric Network. J Am Chem Soc 2018; 140:2777-2780. [PMID: 29437394 DOI: 10.1021/jacs.7b13656] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reported here is a hydrogel-forming polymer network that contains a water-soluble tetracationic macrocycle. Upon immersion of this polymer network in aqueous solutions containing various inorganic and organic salts, changes in the physical properties are observed that are consistent with absorption of the constituent anions into the polymer network. This absorption is ascribed to host-guest interactions involving the tetracationic macrocyclic receptor. Removal of the anions may then be achieved by lifting the resulting hydrogels out of the aqueous phase. Treating the anion-containing hydrogels with dilute HCl leads to the protonation-induced release of the bound anions. This allows the hydrogels to be recycled for reuse. The present polymer network thus provides a potentially attractive approach to removing undesired anions from aqueous environments.
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Affiliation(s)
- Xiaofan Ji
- Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Ren-Tsung Wu
- Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Lingliang Long
- Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin , Austin, Texas 78712, United States.,School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang, Jiangsu 212013, P. R. China
| | - Chenxing Guo
- Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Niveen M Khashab
- Smart Hybrid Materials (SHMs) Laboratory, Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology , Thuwal 23955, Saudi Arabia
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University , Hangzhou 310027, P. R. China
| | - Jonathan L Sessler
- Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin , Austin, Texas 78712, United States.,Center for Supramolecular Chemistry and Catalysis, Shanghai University , Shanghai 200444, China
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10
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Fu ZH, Han X, Shao Y, Fang J, Zhang ZH, Wang YW, Peng Y. Fluorescein-Based Chromogenic and Ratiometric Fluorescence Probe for Highly Selective Detection of Cysteine and Its Application in Bioimaging. Anal Chem 2017; 89:1937-1944. [PMID: 28208244 DOI: 10.1021/acs.analchem.6b04431] [Citation(s) in RCA: 163] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A dual mode fluorescent probe, which is based on an integration of fluorescein and coumarin fluorophores, was developed for the discrimination of Cys from Hcy and GSH. This probe (2) shows the advantage of quick reaction (5 min) with Cys, resulting in a strong fluorescence turn-on response when excited at 450 nm. Notably, it also demonstrates the ratiometric fluorescence property while excited by a shorter wavelength (332 nm). All of results suggest probe 2 has a high selectivity toward Cys even in the presence of other amino acids, cations and anions. The detection limit of Cys was calculated as 0.084 μM, which was much lower than the intracellular concentration. 1H NMR, MS and DFT calculation were used to reveal the detection mechanism further. Finally, this low cytotoxic probe was successfully applied in bioimaging within HepG2 cells.
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Affiliation(s)
- Zhen-Hai Fu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China.,Key Laboratory of Salt Lakes Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences , Xining 810008, People's Republic of China
| | - Xiao Han
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Yongliang Shao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Jianguo Fang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Zhi-Hong Zhang
- Key Laboratory of Salt Lakes Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences , Xining 810008, People's Republic of China
| | - Ya-Wen Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Yu Peng
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China
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11
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Shakya A, Al-Hashimi HM, Banaszak Holl MM. Three RNA Microenvironments Detected in Fluxional Gene Delivery Polyplex Nanoassemblies. ACS Macro Lett 2016; 5:1104-1108. [PMID: 35658189 DOI: 10.1021/acsmacrolett.6b00668] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Prototropic and solvatochromatic properties of fluorescein (FL) were employed to detect the presence of microenvironments in polyplexes consisting of polycationic polymer (POCP) and a fluorescein-conjugated RNA, the HIV-1 transactivation response element (TAR-FL). Results reveal new aspects of polyplex structure with respect to polyplex-bound RNA existing in the following local microenvironments: (a) RNA associated with the polyplex that experiences local pH changes in a manner dependent on POCP nitrogen to RNA phosphate ratio (N:P), (b) RNA experiencing relatively acidic local pH environment that remains constant in polyplexes formed after a charge-neutral ratio, and (c) RNA packed close enough to mediate fluorophore/fluorophore quenching. The magnitude of these changes observed as a function of POCP to nucleic acid N:P ratio is polymer dependent. Assessment of the different microenvironments can help elucidate the functional hierarchy of polyplex-bound oligonucleotides and additionally characterize POCPs based on the resulting local pH and solvent properties upon polyplex formation.
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Affiliation(s)
| | - Hashim M. Al-Hashimi
- Department
of Biochemistry and Chemistry, Duke University Medical Center, Durham, North Carolina 27710, United States
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12
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13
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Vasu AK, Katla J, Malek NI, Kanvah S. Influence of imidazolium ionic liquids on fluorescence of push-pull diphenylbutadienes. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.01.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Naderi F, Farajtabar A, Gharib F. Solvatochromic and preferential solvation of fluorescein in some water-alcoholic mixed solvents. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2013.10.028] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Kumar V, Pandey A, Pandey S. Proton-Transfer Reactions of Acridine in Water-Containing Ionic-Liquid-Rich Mixtures. Chemphyschem 2013; 14:3944-52. [DOI: 10.1002/cphc.201300817] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 09/25/2013] [Indexed: 11/11/2022]
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16
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Rodrigues CAB, Graça C, Maçôas E, Fedorov A, Afonso CAM, Martinho JMG. Excited-State Proton Transfer of Fluorescein Anion as an Ionic Liquid Component. J Phys Chem B 2013; 117:14108-14. [DOI: 10.1021/jp408616r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Catarina A. B. Rodrigues
- Research Institute
for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal
| | - Cátia Graça
- Centro de Quı́mica-Fı́sica
Molecular and IN-Institute of Nanoscience and Nanothecnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Ermelinda Maçôas
- Centro de Quı́mica-Fı́sica
Molecular and IN-Institute of Nanoscience and Nanothecnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Alexander Fedorov
- Centro de Quı́mica-Fı́sica
Molecular and IN-Institute of Nanoscience and Nanothecnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Carlos A. M. Afonso
- Research Institute
for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal
| | - José M. G. Martinho
- Centro de Quı́mica-Fı́sica
Molecular and IN-Institute of Nanoscience and Nanothecnology, Instituto Superior Técnico, University of Lisbon, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
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17
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De Mitri N, Monti S, Prampolini G, Barone V. Absorption and Emission Spectra of a Flexible Dye in Solution: a Computational Time-Dependent Approach. J Chem Theory Comput 2013; 9:4507-4516. [PMID: 26504457 PMCID: PMC4618302 DOI: 10.1021/ct4005799] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The spectroscopic properties of the organic chromophore 4-naphthoyloxy-1-methoxy-2,2,6,6-tetramethylpiperidine (NfO-TEMPO-Me) in toluene solution are explored through an integrated computational strategy combining a classical dynamic sampling with a quantum mechanical description within the framework of the time-dependent density functional theory (TDDFT) approach. The atomistic simulations are based on an accurately parametrized force field, specifically designed to represent the conformational behavior of the molecule in its ground and bright excited states, whereas TDDFT calculations are performed through a selected combination of hybrid functionals and basis sets to obtain optical spectra closely matching the experimental findings. Solvent effects, crucial to obtain good accuracy, are taken into account through explicit molecules and polarizable continuum descriptions. Although, in the case of toluene, specific solvation is not fundamental, the detailed conformational sampling in solution has confirmed the importance of a dynamic description of the molecular geometry for a reliable description of the photophysical properties of the dye. The agreement between theoretical and experimental data is established and a robust protocol for the prediction of the optical behaviour of flexible fluorophores in solution is set.
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Affiliation(s)
- Nicola De Mitri
- Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Susanna Monti
- Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy ; Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Giacomo Prampolini
- Istituto per i Processi Chimico-Fisici (IPCF-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy
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18
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Bhagi A, Pandey S, Pandey A, Pandey S. Fluorescein Prototropism within Poly(ethylene glycol)s and Their Aqueous Mixtures. J Phys Chem B 2013; 117:5230-40. [DOI: 10.1021/jp402113s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ambika Bhagi
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Shubha Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Ashish Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Siddharth Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Affiliation(s)
- Supratim Banerjee
- Institut für Organische
Chemie, Universität Regensburg,
D-93040 Regensburg,
Germany
| | - Burkhard König
- Institut für Organische
Chemie, Universität Regensburg,
D-93040 Regensburg,
Germany
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20
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Gallagher S, Kavanagh A, Florea L, MacFarlane DR, Fraser KJ, Diamond D. Temperature and pH triggered release characteristics of water/fluorescein from 1-ethyl-3-methylimidazolium ethylsulfate based ionogels. Chem Commun (Camb) 2013; 49:4613-5. [DOI: 10.1039/c3cc41272e] [Citation(s) in RCA: 17] [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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21
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Abstract
The photochemical behavior of xanthene dyes (fluorescein, erythrosine, and eosin) with colloidal SnO2nanoparticles was probed by UV-visible, steady state, and time resolved fluorescence measurements. The prepared SnO2nanoparticles were characterized by using UV-visible and powder XRD measurements. The xanthene dyes were adsorbed on the surface of colloidal SnO2nanoparticles through electrostatic interaction. Apparent association constant (Kapp) was calculated from the relevant fluorescence data. The larger value of apparent association constant indicates a strong association between xanthene dyes and SnO2nanoparticles. The fluorescence quenching is mainly attributed to electron transfer from the excited state xanthenes to the conduction band of colloidal SnO2. The electron transfer mechanism was explained based on the Rehm-Weller equation as well as the energy level diagram.
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22
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Kumar V, Pandey S. Selective Quenching of 2-Naphtholate Fluorescence by Imidazolium Ionic Liquids. J Phys Chem B 2012; 116:12030-7. [DOI: 10.1021/jp3080817] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vinod Kumar
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Siddharth Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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23
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Coloring–decoloring behavior of amphiphilic fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide – Acryloylmorpholine cooligomer/fluorescein nanocomposites in protic and aprotic solvents. J Colloid Interface Sci 2012; 377:76-80. [DOI: 10.1016/j.jcis.2012.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 03/03/2012] [Accepted: 03/06/2012] [Indexed: 11/21/2022]
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24
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Naushad M, Alothman ZA, Khan AB, Ali M. Effect of ionic liquid on activity, stability, and structure of enzymes: a review. Int J Biol Macromol 2012; 51:555-60. [PMID: 22732130 DOI: 10.1016/j.ijbiomac.2012.06.020] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2012] [Revised: 06/12/2012] [Accepted: 06/14/2012] [Indexed: 10/28/2022]
Abstract
Ionic liquids have shown their potential as a solvent media for many enzymatic reactions as well as protein preservation, because of their unusual characteristics. It is also observed that change in cation or anion alters the physiochemical properties of the ionic liquids, which in turn influence the enzymatic reactions by altering the structure, activity, enatioselectivity, and stability of the enzymes. Thus, it is utmost need of the researchers to have full understanding of these influences created by ionic liquids before choosing or developing an ionic liquid to serve as solvent media for enzymatic reaction or protein preservation. So, in the present review, we try to shed light on effects of ionic liquids chemistry on structure, stability, and activity of enzymes, which will be helpful for the researchers in various biocatalytic applications.
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Affiliation(s)
- Mu Naushad
- Advanced Materials Research Chair, Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
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Kumar Das S, Sarkar M. Studies on the Solvation Dynamics of Coumarin 153 in 1-Ethyl-3-Methylimidazolium Alkylsulfate Ionic Liquids: Dependence on Alkyl Chain Length. Chemphyschem 2012; 13:2761-8. [DOI: 10.1002/cphc.201200185] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/18/2012] [Indexed: 11/09/2022]
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Pandey S, Ali M, Kamath G, Pandey S, Baker SN, Baker GA. Binding of the ionic liquid cation 1-alkyl-3-methylimidazolium to p-tetranitrocalix[4]arene probed by fluorescent indicator displacement. Anal Bioanal Chem 2012; 403:2361-6. [DOI: 10.1007/s00216-012-5980-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 03/20/2012] [Accepted: 03/26/2012] [Indexed: 10/28/2022]
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Ghosh KK, Ha HH, Kang NY, Chandran Y, Chang YT. Solid phase combinatorial synthesis of a xanthone library using click chemistry and its application to an embryonic stem cell probe. Chem Commun (Camb) 2011; 47:7488-90. [DOI: 10.1039/c1cc11962a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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