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Mádi L, Kučera J, Káňa Š, Bržezická T, Táborský P. Reducing the water quenching processes using heavy water in capillary electrophoresis with fluorescence detection. J Chromatogr A 2024; 1736:465411. [PMID: 39368194 DOI: 10.1016/j.chroma.2024.465411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2024] [Revised: 09/26/2024] [Accepted: 09/29/2024] [Indexed: 10/07/2024]
Abstract
Water, ubiquitous in analytical methods, is renowned for its fluorescence quenching properties, influencing techniques like fluorescence spectrophotometry or techniques with fluorescence detection. This study explores the impact of water (H₂O) substitution for heavy water (D₂O) on the fluorescence behavior of anthraquinones and anthracyclines. Anthraquinones and anthracyclines play crucial roles in pharmacy, serving as essential components in various therapeutic formulations, particularly in cancer treatment and other pharmacological interventions. Capillary electrophoresis (CE) with heavy water as the background electrolyte (BGE) solvent offers superior sensitivity to the separation and detection of these analytes. Experimental results demonstrate the improved detection limits and separation efficiency of selected anthraquinones rhein (RH), aloe-emodin (AE), and anthracyclines doxorubicin (DOX), epirubicin (EPI) and daunorubicine (DAU) in heavy water-based buffers, highlighting the potential of heavy water in advancing analytical chemistry.
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Affiliation(s)
- Lenka Mádi
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic
| | - Josef Kučera
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic
| | - Štěpán Káňa
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic
| | - Taťána Bržezická
- Department of Biochemistry, Faculty of Science, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic
| | - Petr Táborský
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic.
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2
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Zheng F, Luo Y, Li C, Huang Y, Lu Z, Hou X. A water-soluble sensor for distinguishing D 2O from H 2O by dual-channel absorption/fluorescence ratiometry. Chem Commun (Camb) 2022; 58:12863-12866. [DOI: 10.1039/d2cc05033a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel D2O optical sensor Cy with integrated great water-solubility, absorption/fluorescence dual-channel ratiometric response and even red-green-blue visual sensing application.
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Affiliation(s)
- Fei Zheng
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Chengdu, Sichuan 610064, China
| | - Yanju Luo
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Chengdu, Sichuan 610064, China
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Chenghui Li
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yan Huang
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Chengdu, Sichuan 610064, China
| | - Zhiyun Lu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Chengdu, Sichuan 610064, China
| | - Xiandeng Hou
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Chengdu, Sichuan 610064, China
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
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3
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Mewes L, Ingle RA, Al Haddad A, Chergui M. Broadband visible two-dimensional spectroscopy of molecular dyes. J Chem Phys 2021; 155:034201. [PMID: 34293898 DOI: 10.1063/5.0053554] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Two-dimensional Fourier transform spectroscopy is a promising technique to study ultrafast molecular dynamics. Similar to transient absorption spectroscopy, a more complete picture of the dynamics requires broadband laser pulses to observe transient changes over a large enough bandwidth, exceeding the inhomogeneous width of electronic transitions, as well as the separation between the electronic or vibronic transitions of interest. Here, we present visible broadband 2D spectra of a series of dye molecules and report vibrational coherences with frequencies up to ∼1400 cm-1 that were obtained after improvements to our existing two-dimensional Fourier transform setup [Al Haddad et al., Opt. Lett. 40, 312-315 (2015)]. The experiment uses white light from a hollow core fiber, allowing us to acquire 2D spectra with a bandwidth of 200 nm, in a range between 500 and 800 nm, and with a temporal resolution of 10-15 fs. 2D spectra of nile blue, rhodamine 800, terylene diimide, and pinacyanol iodide show vibronic spectral features with at least one vibrational mode and reveal information about structural motion via coherent oscillations of the 2D signals during the population time. For the case of pinacyanol iodide, these observations are complemented by its Raman spectrum, as well as the calculated Raman activity at the ground- and excited-state geometry.
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Affiliation(s)
- Lars Mewes
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Rebecca A Ingle
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Andre Al Haddad
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
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4
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Maillard J, Klehs K, Rumble C, Vauthey E, Heilemann M, Fürstenberg A. Universal quenching of common fluorescent probes by water and alcohols. Chem Sci 2020; 12:1352-1362. [PMID: 34163898 PMCID: PMC8179231 DOI: 10.1039/d0sc05431c] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 11/18/2020] [Indexed: 12/13/2022] Open
Abstract
Although biological imaging is mostly performed in aqueous media, it is hardly ever considered that water acts as a classic fluorescence quencher for organic fluorophores. By investigating the fluorescence properties of 42 common organic fluorophores recommended for biological labelling, we demonstrate that H2O reduces their fluorescence quantum yield and lifetime by up to threefold and uncover the underlying fluorescence quenching mechanism. We show that the quenching efficiency is significantly larger for red-emitting probes and follows an energy gap law. The fluorescence quenching finds its origin in high-energy vibrations of the solvent (OH groups), as methanol and other linear alcohols are also found to quench the emission, whereas it is restored in deuterated solvents. Our observations are consistent with a mechanism by which the electronic excitation of the fluorophore is resonantly transferred to overtones and combination transitions of high-frequency vibrational stretching modes of the solvent through space and not through hydrogen bonds. Insight into this solvent-assisted quenching mechanism opens the door to the rational design of brighter fluorescent probes by offering a justification for protecting organic fluorophores from the solvent via encapsulation.
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Affiliation(s)
- Jimmy Maillard
- Department of Physical Chemistry, University of Geneva 1211 Geneva Switzerland
- Department of Inorganic and Analytical Chemistry, University of Geneva 1211 Geneva Switzerland
| | - Kathrin Klehs
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt 60438 Frankfurt am Main Germany
| | - Christopher Rumble
- Department of Physical Chemistry, University of Geneva 1211 Geneva Switzerland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva 1211 Geneva Switzerland
| | - Mike Heilemann
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt 60438 Frankfurt am Main Germany
| | - Alexandre Fürstenberg
- Department of Physical Chemistry, University of Geneva 1211 Geneva Switzerland
- Department of Inorganic and Analytical Chemistry, University of Geneva 1211 Geneva Switzerland
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5
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Luo Y, Li C, Zhu W, Zheng X, Huang Y, Lu Z. A Facile Strategy for the Construction of Purely Organic Optical Sensors Capable of Distinguishing D
2
O from H
2
O. Angew Chem Int Ed Engl 2019; 58:6280-6284. [DOI: 10.1002/anie.201900806] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/04/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Yanju Luo
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Chuan Li
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Wencheng Zhu
- Shanghai Institute of Biochemistry and Cell BiologyChinese Academy of Sciences Shanghai 200031 P. R. China
| | - Xujun Zheng
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Yan Huang
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Zhiyun Lu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
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6
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Luo Y, Li C, Zhu W, Zheng X, Huang Y, Lu Z. A Facile Strategy for the Construction of Purely Organic Optical Sensors Capable of Distinguishing D
2
O from H
2
O. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900806] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Yanju Luo
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Chuan Li
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Wencheng Zhu
- Shanghai Institute of Biochemistry and Cell BiologyChinese Academy of Sciences Shanghai 200031 P. R. China
| | - Xujun Zheng
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Yan Huang
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
| | - Zhiyun Lu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education)College of ChemistrySichuan University Chengdu 610064 P. R. China
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7
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Kusinski M, Nagesh J, Gladkikh M, Izmaylov AF, Jockusch RA. Deuterium isotope effect in fluorescence of gaseous oxazine dyes. Phys Chem Chem Phys 2019; 21:5759-5770. [PMID: 30801583 DOI: 10.1039/c8cp05731a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The increased utility of fluorescence-based methods in recent years has highlighted the need for brighter, more efficient fluorophores. In order to design these fluorophores, an improved fundamental understanding is necessary of the structural components that intrinsically effect fluorescence efficiency. Here, we characterize the intrinsic effects of deuteration on fluorescence from gaseous oxazine dyes, without the influence of dye-solvent interactions, by making use of an ion trap mass spectrometer that has been altered to enable optical measurements. Comparison of emission spectra of four oxazine dyes: cresyl violet, oxazine 4, oxazine 170, and darrow red, show little change in profile upon deuteration of amine groups. However, deuteration significantly increases the efficiency of fluorescence with an increase in fluorescence lifetime and brightness by 10-23% for the gaseous dyes. This increase is less than half that of the quantum yield increase observed in deuterated solution. This indicates the large fluorescence efficiency changes for the oxazine dyes in deuterated solution result from a combination of both intrinsic effects as well as substantial contribution from altered fluorophore-solvent interactions. The intrinsic effects behind increased lifetime upon deuteration are explored using time-dependent density functional theory (TD-DFT) calculations of potential energy surfaces (PESs) for ground and low lying excited electronic states. In accord with experimental observations, calculated S1-S0 emission spectra show only minor differences between deuterated and non-deuterated forms indicating that the deuteration does not affect the radiative channel appreciably. Relaxed PES scans along the torsional motions of the amino groups reveal that the increase in lifetimes upon deuteration is likely due to quenching of different radiationless changes channels in different oxazine dyes. Calculations suggest that tunneling to access twisted intramolecular charge transfer states in S1 is critical in several of the oxazines. However, in at least one of the dyes examined, the large isotope effect is more likely due to differences in intersystem crossing rates. Overall, this combined experimental and computational investigation elucidates the photophysics of a well-known fluorescent scaffold and provides insight into how small differences can dramatically affect fluorescence outcomes.
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8
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Catone D, O’Keeffe P, Satta M, Paladini A, Ciavardini A, Toschi F, Turchini S, Avaldi L. A combined theoretical and experimental study of the ultrafast photophysics of Rhodamine B. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1464670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Daniele Catone
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Patrick O’Keeffe
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Mauro Satta
- CNR-ISMN, Dipartimento di Chimica, University of Rome Sapienza , Rome, Italy
| | - Alessandra Paladini
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Alessandra Ciavardini
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Francesco Toschi
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Stefano Turchini
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
| | - Lorenzo Avaldi
- Istituto di Struttura della Materia-CNR (ISM-CNR), Division of Ultrafast Processes in Materials (FLASHit) , Rome, Italy
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9
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Wang H, Duan A, Dahlgren RA, Li Y, Li C, Wang W, Zeng A, Wang X. The joint effects of room temperature ionic liquids and ordered media on fluorescence characteristics of estrogens in water and methanol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 128:497-507. [PMID: 24685901 DOI: 10.1016/j.saa.2014.02.144] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Revised: 01/23/2014] [Accepted: 02/23/2014] [Indexed: 06/03/2023]
Abstract
This study investigated the steady-state and time-resolved fluorescence properties of 17α-ethinylestradiol (EE2) and 17β-estradiol (E2) in the presence of ordered media (β-cyclodextrins (β-CD) and cetyltrimethylammonium bromide (CTAB)). In addition, we analyzed the effects of four room temperature ionic liquids (RTILs) on the fluorescence intensities (FIs) of EE2/β-CD and E2/β-CD inclusion complexes in methanol. Both β-CD and CTAB enhanced the fluorescence of EE2 and E2. The FIs of EE2 and E2 with β-CD or CTAB in methanol were greater than those in water, possibly resulting from decreased oxygen-quenching in H2O molecules. β-CD and CTAB may form inclusion complexes with estrogen in both water and methanol. The inclusion ratio of the complex was 1:1 and the inclusion constant (K) values in water were greater than those in methanol. The fluorescence lifetimes were 2.50 and 4.13 ns for EE2 and 2.58 and 4.03 ns for E2 in aqueous solution and methanol, respectively. The changing trend of fluorescence lifetimes for EE2 and E2 in β-CD or CTAB was similar to the steady-state FIs. The four RTILs had a significant quenching effect on the FIs of EE2/β-CD and E2/β-CD, and the quenching process for EE2/β-CD and E2/β-CD by RTILs was demonstrated to be a dynamic quenching mechanism. Fluorescent data obtained from these complex systems provide a theoretical foundation for understanding the interaction mechanisms between ordered media and RTILs in the analysis of estrogens.
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Affiliation(s)
- Huili Wang
- School of Life Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Ailian Duan
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China
| | - Randy A Dahlgren
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China; Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
| | - Yanyan Li
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China
| | - Changli Li
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China
| | - Wenwei Wang
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China
| | - Aibing Zeng
- School of Life Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Xuedong Wang
- Wenzhou Applied Technology & Environmental Research Institute, Wenzhou Medical University, Wenzhou 325035, China.
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10
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Ferreira JAB, Serra VV, Sánchez-Coronilla A, Pires SMG, Faustino MAF, Silva AMS, Neves MGPMS, Cavaleiro JAS, Costa SMB. The near-mid-IR HOMO-LUMO gap in amide linked porphyrin-rhodamine dyads. Chem Commun (Camb) 2014; 49:8809-11. [PMID: 23959210 DOI: 10.1039/c3cc44925d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Novel amide linked porphyrin-rhodamine dyads yield utmost intense red-shifted electronic transitions beyond the near-infrared region.
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Affiliation(s)
- José A B Ferreira
- Universidade de Lisboa, Instituto Superior Técnico, Centro de Química Estrutural, Lisbon, Portugal.
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11
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Greisch JF, Harding ME, Kordel M, Klopper W, Kappes MM, Schooss D. Intrinsic fluorescence properties of rhodamine cations in gas-phase: triplet lifetimes and dispersed fluorescence spectra. Phys Chem Chem Phys 2013; 15:8162-70. [DOI: 10.1039/c3cp44362k] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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12
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Ferreira JAB, Sánchez-Coronilla A, Togashi DM, Ferreira H, Ascenso JR, Costa SMB. Electrophilic reactivity of tetrabromorhodamine 123 is bromine induced: convergent interpretation through complementary molecular descriptors. J Phys Chem A 2012; 116:11938-45. [PMID: 23134615 DOI: 10.1021/jp307461m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nucleophilic addition of water and of methanol to 3,6-diamino-2,4,5,7-tetrabromo-9-[2-(methoxycarbonyl) phenyl]-9H-xanthen-9-ylium, 4BrR123, yields respectively 2-(3,6-diamino-2,4,5,7-tetrabromo-9-hydroxy-9H-xanthen-9-yl)xanthyl benzoate, HO4BrR123 and 2-(3,6-diamino-2,4,5,7-tetrabromo-9-methoxy-9H-xanthen-9-yl)xanthyl benzoate, MeO4BrR123. The novel experimental results are addressed theoretically. The linear free energy relationship, LFER, second-order perturbation theory analysis of the natural bond orbital, NBO, and quantum theory of atoms in molecules, QTAIM, lead to the same conclusion: the electron-withdrawing effect of bonded Br atoms in 4BrR123 extremely enhances the molecular electrophilicity, as compared to 3,6-diamino-9-[2-(methoxycarbonyl) phenyl]-9H-xanthen-9-ylium, R123. The reactivity of these diaminoxanthylium cations is discussed in the context of local and global softness in extended conjugated systems.
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Affiliation(s)
- José A B Ferreira
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal.
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13
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Bakkialakshmi S, Menaka T. A study of the interaction between rhodamine 6g and hydroxy propyl β-cyclodextrin by steady state fluorescence. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 81:8-13. [PMID: 21724451 DOI: 10.1016/j.saa.2011.04.082] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 03/18/2011] [Accepted: 04/29/2011] [Indexed: 05/31/2023]
Abstract
The binding of rhodamine 6G and hydroxy propyl β-cyclodextrin (Hβ-CD) was investigated measuring fluorescence and absorption at pH 7.0. The solid inclusion complex of Rh6G and Hβ-CD has been studied by Ultraviolet (UV) spectroscopy, Fluorimetry, Fourier Transform Infrared (FTIR), (1)H Nuclear Magnetic Resonance ((1)HNMR) and in the Scanning Electron Microscope (SEM). Association constant K(g) and K(e) were determined by the enhancement of the fluorescence of rhodamine 6G in the presence of Hβ-CD. Fluorescence of Rh6G is generally enhanced, in complexes of Rh6G and β-Cyclodextrin in aqueous solutions. The free energy change for the ground state (ΔG(g)) and for the excited state (ΔG(e)) have also been determined. The experimental results indicated that the inclusion process is an exothermic and spontaneous.
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Affiliation(s)
- S Bakkialakshmi
- Department of Physics, Annamalai University, Annamalainagar-608 002, TamilNadu, India.
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14
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15
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16
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Ferreira JAB, Costa SMB. Electronic Excited-State Behavior of Rhodamine 3B in AOT Reverse Micelles Sensing Contact Ion Pair to Solvent Separated Ion Pair Interconversion. J Phys Chem B 2010; 114:10417-26. [DOI: 10.1021/jp100571t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José A. B. Ferreira
- Universidade Técnica de Lisboa, Instituto Superior Técnico, Centro de Química Estrutural, Complexo Interdisciplinar, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - Sílvia M. B. Costa
- Universidade Técnica de Lisboa, Instituto Superior Técnico, Centro de Química Estrutural, Complexo Interdisciplinar, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
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17
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Chingin K, Balabin RM, Frankevich V, Chen H, Barylyuk K, Nieckarz R, Fedorov A, Zenobi R. Optical properties of protonated Rhodamine 19 isomers in solution and in the gas phase. Phys Chem Chem Phys 2010; 12:14121-7. [DOI: 10.1039/c0cp00482k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Madeira C, Estrela N, Ferreira JAB, Andrade SM, Costa SMB, Melo EP. Fluorescence lifetime imaging microscopy and fluorescence resonance energy transfer from cyan to yellow fluorescent protein validates a novel method to cluster proteins on solid surfaces. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:044035. [PMID: 19725746 DOI: 10.1117/1.3210770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel method to distribute proteins on solid surfaces is proposed. Proteins microencapsulated in the water pool of reverse micelles were used to coat a solid surface with well-individualized round spots of 1 to 3 microm in diameter. The number of spots per unit area can be increased through the concentration of reverse micelles, and networks of spots were obtained at high concentrations of large reverse micelles. Moreover, depending on the pool size of the water reverse micelles, proteins can be deposited far from each other or in close proximity within the range of 50 to 70 A. This proximity obtained with small reverse micelles was proved through fluorescence lifetime imaging microscopy and fluorescence resonance energy transfer (FLIM-FRET) measurements for the most relevant FRET pair in cell biology studies, the cyan and yellow fluorescent proteins. This novel procedure has several advantages and reveals the potential for study of protein-protein interactions on solid surfaces and for developing novel biomaterials and molecular devices based on biorecognition elements.
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Affiliation(s)
- Catarina Madeira
- Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Tecnico, Av Rovisco Pais, Lisbon, 1049-001, Portugal
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19
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Beija M, Afonso CAM, Martinho JMG. Synthesis and applications of Rhodamine derivatives as fluorescent probes. Chem Soc Rev 2009; 38:2410-33. [DOI: 10.1039/b901612k] [Citation(s) in RCA: 1095] [Impact Index Per Article: 73.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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20
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Galbán J, Mateos E, Cebolla V, Domínguez A, Delgado-Camón A, de Marcos S, Sanz-Vicente I, Sanz V. The environmental effect on the fluorescence intensity in solution. An analytical model. Analyst 2009; 134:2286-92. [DOI: 10.1039/b912063g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Ferreira JAB. Structural effects of biologically relevant rhodamines on spectroscopy of fluorescence fluctuations. Ann N Y Acad Sci 2008; 1130:85-90. [PMID: 18596336 DOI: 10.1196/annals.1430.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Exciton coupling in pi-pi complexes between the indole ring and other pi systems is known to enhance the efficiency of energy and electron transfer. Rhodamines' xanthylium rings allow the formation of weakly or nonfluorescent complexes with the amino acid tryptophan. Thus, because of the short distance of the participating electronic clouds, intrinsic electron transfer-induced fluorescence quenching occurs. In solution, the rate constant of electron transfer is known to be limited by collision interactions at the contact distance. By contrast, in protein local environments tryptophan residues can be either exposed or buried in hydrophobic regions. Herein, I report on the properties of aromatic derivatized rhodamines, among which is one with a bound phenylalanine amino acid group. Encompassed is the spectroscopic and kinetic information in bulk and at the single-molecule levels both in free solution and in the presence of human serum albumin. Spectroscopic characteristics are focused with special emphasis on enhanced fluorescence that is addressed considering optimized geometries and electronic spectra. The importance of the probes associated with peptides and metal ions both in condensed phase or interfaces and as substrates with proteins is put into perspective.
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Affiliation(s)
- José A B Ferreira
- Centro de Química Estrutural, Complexo Interdisciplinar, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisbon, Portugal.
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Angulo G, Organero JA, Carranza MA, Douhal A. Probing the Behavior of Confined Water by Proton-Transfer Reactions. J Phys Chem B 2006; 110:24231-7. [PMID: 17125396 DOI: 10.1021/jp064257g] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The picosecond dynamics of a bifunctional and H-bonding molecule, 7-hydroxyquinoline (7HQ), has been studied in a reverse micelle with increasing water content. The fluorescence kinetics has a complex behavior as the water content is changed. All reactions are irreversible, and a two-step mechanism is invoked to explain the observations. H2O/D2O exchange and excitation energy effects show that the second step has a higher barrier and that the corresponding reaction occurs through tunneling. The results clearly indicate two regimes of water nanopool behavior switching at W0 approximately 5 (W0 = [water]/[surfactant]). Water collective dynamics explains these observations. The lower fluidity of confined water within the reverse micelle with respect to normal bulk water alters the related H-bond network dynamics and therefore is responsible for the slower proton-transfer processes.
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Affiliation(s)
- G Angulo
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain
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