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Mal M, Mandal D. Double proton transfer in a polar nano-droplet: Phototautomerization of alloxazine in AOT/alkane reverse micelles containing water or glycerol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 255:119708. [PMID: 33784597 DOI: 10.1016/j.saa.2021.119708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
Alloxazine phototautomerization is believed to occur through an excited state double proton transfer (ESDPT) mechanism involving cyclic intermolecular H-bonded complexes between Alloxazine and hydroxylic solvents like water and alcohols. In AOT/alkane dispersions in the absence of any polar liquid, Alloxazine molecules reside inside the polar core of the AOT reverse micelle nanoparticles, where they involve in H-bonding with the anionic sulfonate head-groups of the AOT molecules, but are unable to generate the appropriate cyclic intermolecular H-bonded complexes conducive to ESDPT. However, tautomerization is switched on with addition of water and formation ofwater nano-droplet at the core of reverse micelle. Evidently, the Alloxazine⋅⋅⋅⋅AOT H-bonds are now replaced by Alloxazine⋅⋅⋅⋅Water H-bonds, promotingESDPT. On the other hand, Alloxazine phototautomerization is hindered in Glycerol, irrespective of whether the latter is in the bulk liquid state or in the form of a polar nano-droplet. This may be explained by steric considerations.
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Affiliation(s)
- Madhushree Mal
- Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700009, India
| | - Debabrata Mandal
- Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700009, India.
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Sinha S, Gharat PM, Pal H, Dutta Choudhury S. Lumichrome tautomerism in alcohol-water mixtures: Effect of carbon chain length and mole fraction of alcohols. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Bapli A, Gautam RK, Jana R, Seth D. Investigation of Different Prototropic Forms of Biologically Active Flavin Lumichrome in the Presence of Liposome. Photochem Photobiol 2019; 95:1151-1159. [PMID: 30932194 DOI: 10.1111/php.13105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/26/2019] [Indexed: 12/26/2022]
Abstract
Herein, we reported the photophysical behavior of lumichrome (LC), one of the biologically active flavin molecules, in the presence of small unilamellar vesicle of anionic lipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). With the help of different spectroscopic techniques, we have proposed that anionic DMPC liposome interacts with the cationic form LC in ground state and in excited state and modulate the spectral properties of LC. Photophysical study reveals that different prototropic forms of LC are present in DMPC liposome medium. In the presence of DMPC liposome, fluorescence emission properties of LC vary with change in excitation and emission wavelengths. This indicates switch over between different structural forms of LC. From fluorescence lifetime measurements and fluorescence lifetime imaging (FLIM) study, it was revealed that emission decay profile of LC was fitted biexponentially in the presence of liposome. It suggests that in the presence of liposome, more than one form of LC is present. We have constructed the time-resolved area-normalized emission spectra (TRANES) of LC in the liposome and found one isoemissive point. This confirmed that two emissive species of LC are present in liposome. FLIM study and FE-SEM study give an idea about the structural feature of the complex between LC and liposome.
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Affiliation(s)
- Aloke Bapli
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | | | - Rabindranath Jana
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
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6
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Dutta Choudhury S, Pal H. Intriguing Tautomerism of Lumichrome in Binary Aqueous Solvent Mixtures: Implications for Probing Microenvironments. J Phys Chem B 2016; 120:11970-11977. [DOI: 10.1021/acs.jpcb.6b08777] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Maity B, Ahmed SA, Seth D. Interaction of Biologically Active Flavins inside Bile Salt Aggregates: Molecular Level Investigation. J Phys Chem B 2016; 120:9854-66. [PMID: 27557394 DOI: 10.1021/acs.jpcb.6b04870] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work we have studied the photophysics of biologically active flavin molecule lumichrome (LCM) in different bile-salt aggregates. With alteration of the functional groups of the bile salts, the photophysics of confined fluorophore is largely affected and shows difference in their spectral behavior. This study also reveals the selective prototropic species of LCM present in bile salt aggregates. In the presence of the bile salt aggregates, LCM molecule shows excitation and emission wavelength-dependent emission properties, indicating switch over of the structural change of different prototropic form of the LCM molecule. The observation of higher rotational relaxation time in NaDC aggregates compared to NaTC aggregates clearly reflects that NaDC aggregates are more rigid due to its greater hydrophobicity and large in size, which is capable to bind the guest molecule more into their nanoconfined medium. Moreover, due to less acidic nature, NaDC aggregates have more ability to accept hydrogen bond from the LCM molecule and show the selective formation of isoalloxazine N10 anion (A1 monoanionic form) of LCM.
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Affiliation(s)
- Banibrata Maity
- Department of Chemistry, Indian Institute of Technology Patna , Patna 801103, Bihar, India
| | - Sayeed Ashique Ahmed
- Department of Chemistry, Indian Institute of Technology Patna , Patna 801103, Bihar, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna , Patna 801103, Bihar, India
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Dutta Choudhury S, Vir P, Mohanty J, Bhasikuttan AC, Pal H. Selective prototropism of lumichrome in cationic micelles and reverse micelles: a photophysical perspective. RSC Adv 2016. [DOI: 10.1039/c5ra23562f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BHDC micelles and reverse micelles selectively transform the alloxazine form of lumichrome to the anionic isoalloxazine form, around neutral pH.
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Affiliation(s)
| | - Praveen Vir
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | | | - Haridas Pal
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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Ahmad I, Anwar Z, Ahmed S, Sheraz MA, Bano R, Hafeez A. Solvent Effect on the Photolysis of Riboflavin. AAPS PharmSciTech 2015; 16:1122-8. [PMID: 25698084 DOI: 10.1208/s12249-015-0304-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 01/27/2015] [Indexed: 11/30/2022] Open
Abstract
The kinetics of photolysis of riboflavin (RF) in water (pH 7.0) and in organic solvents (acetonitrile, methanol, ethanol, 1-propanol, 1-butanol, ethyl acetate) has been studied using a multicomponent spectrometric method for the assay of RF and its major photoproducts, formylmethylflavin and lumichrome. The apparent first-order rate constants (k obs) for the reaction range from 3.19 (ethyl acetate) to 4.61 × 10(-3) min(-1) (water). The values of k obs have been found to be a linear function of solvent dielectric constant implying the participation of a dipolar intermediate along the reaction pathway. The degradation of this intermediate is promoted by the polarity of the medium. This indicates a greater stabilization of the excited-triplet states of RF with an increase in solvent polarity to facilitate its reduction. The rate constants for the reaction show a linear relation with the solvent acceptor number indicating the degree of solute-solvent interaction in different solvents. It would depend on the electron-donating capacity of RF molecule in organic solvents. The values of k obs are inversely proportional to the viscosity of the medium as a result of diffusion-controlled processes.
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Maity B, Chatterjee A, Seth D. Photophysics of lumichrome in anionic and cationic micellar media. RSC Adv 2015. [DOI: 10.1039/c4ra14998j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The photophysics of lumichrome in the presence of cationic and anionic micellar environments was reported in this article.
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Affiliation(s)
- Banibrata Maity
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | - Aninda Chatterjee
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | - Debabrata Seth
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
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11
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Prukala D, Khmelinskii I, Koput J, Gierszewski M, Pędziński T, Sikorski M. Photophysics, excited-state double-proton transfer and hydrogen-bonding properties of 5-deazaalloxazines. Photochem Photobiol 2014; 90:972-88. [PMID: 24816028 DOI: 10.1111/php.12289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 05/06/2014] [Indexed: 11/30/2022]
Abstract
The photophysical properties of 5-deazaalloxazine and 1,3-dimethyl-5-deazaalloxazine were studied in different solvents. These compounds have higher values of fluorescence quantum yields and longer fluorescence lifetimes, compared to those obtained for their alloxazine analogs. Electronic structure and S0 -Si transitions were investigated using the ab initio methods [MP2, CIS(D), EOM-CCSD] with the correlation-consistent basis sets. Also the time-dependent density functional theory (TD-DFT) has been employed. The lowest singlet excited states of 5-deazaalloxazine and 1,3-dimethyl-5-deazaalloxazine are predicted to have the π, π* character, whereas similar alloxazines have two close-lying π, π* and n, π* transitions. Experimental steady-state and time-resolved spectral studies indicate formation of an isoalloxazinic excited state via excited-state double-proton transfer (ESDPT) catalyzed by an acetic acid molecule that forms a hydrogen bond complex with the 5-deazaalloxazine molecule. Solvatochromism of both 5-deazaalloxazine and its 1,3-dimethyl substituted derivative was analyzed using the Kamlet-Taft scale and four-parameter Catalán solvent scale. The most significant result of our studies is that the both scales show a strong influence of solvent acidity (hydrogen bond donating ability) on the emission properties of these compounds, indicating the importance of intermolecular solute-solvent hydrogen-bonding interactions in their excited state.
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Affiliation(s)
- Dorota Prukala
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
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Moyon NS, Mitra S. Fluorescence solvatochromism in lumichrome and excited-state tautomerization: a combined experimental and DFT study. J Phys Chem A 2011; 115:2456-64. [PMID: 21388154 DOI: 10.1021/jp1102687] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence solvatochromism of lumichrome (LC) was studied by steady-state and time-resolved fluorescence spectroscopy. The excited-state properties of LC do not show any correlation with solvent polarity, however, reasonably good correlation with solvent E(T)(30) parameter was observed. A quantitative estimation of contribution from different solvatochromic parameters, like solvent polarizability (π*), hydrogen bond donor (α), and hydrogen bond acceptor (β) ability of the solvent, was made using linear free energy relationship on the basis of Kamlet-Taft equation. The analysis reveals that hydrogen bond donating ability (acidity) of the solvent is the most important parameter that characterizes the excited-state behavior of lumichrome. Quantum mechanical calculations using density functional theory (DFT) were done to study the most stable structure and excited-state tautomerization process of LC toward the formation of isoalloxazines. Charge localization in the excited state and formation of hydrogen-bonded cluster through solvent hydrogen bond donation on the N10 atom of alloxazine moiety were predicted to be the key step toward this water-catalyzed tautomerization process.
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13
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Fluorescence quenching and the binding interaction of lumichrome with nucleic acids. CHINESE SCIENCE BULLETIN-CHINESE 2010. [DOI: 10.1007/s11434-010-4008-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Bairi P, Roy B, Nandi AK. Bicomponent Hydrogels of Lumichrome and Melamine: Photoluminescence Property and Its Dependency on pH and Temperature. J Phys Chem B 2010; 114:11454-61. [DOI: 10.1021/jp105378e] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Partha Bairi
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Bappaditya Roy
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Arun K. Nandi
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Sikorski M, Prukała D, Insińska-Rak M, Khmelinskii I, Worrall DR, Williams SL, Hernando J, Bourdelande JL, Koput J, Sikorska E. Spectroscopy and photophysics of dimethyl-substituted alloxazines. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Sikorska E, Khmelinskii I, Kubicki M, Prukała W, Hoffmann M, Machado IF, Ferreira LFV, Karolczak J, Worrall DR, Krawczyk A, Insińska-Rak M, Sikorski M. In Search of Excited-State Proton Transfer in the Lumichrome Dimer in the Solid State: Theoretical and Experimental Approach. J Phys Chem A 2006; 110:4638-48. [PMID: 16599430 DOI: 10.1021/jp060072y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Quantum chemical density functional theory (DFT) calculations and spectral data were employed to investigate the possibility of the excited-state double proton transfer (ESDPT) in lumichrome crystals. The calculations in a lumichrome dimer predict a transfer of a proton in the first excited state, leading to a cation-anion pair. The presently reported X-ray structure of 1,3-dimethyllumichrome and its complex solid-state luminescence indicate that also in this molecule intermolecular hydrogen bonds might be involved in the photophysics. The long-wavelength emission in lumichrome crystals peaked at 530 nm is attributed to excited-state proton transfer, whereas a wider emission band in methylated lumichrome derivatives peaked at 560 nm is attributed to ions formed upon photoexcitation of the crystals.
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Affiliation(s)
- Ewa Sikorska
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland
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Sikorska E, Khmelinskii I, Hoffmann M, Machado IF, Ferreira LFV, Dobek K, Karolczak J, Krawczyk A, Insińska-Rak M, Sikorski M. Ground- and Excited-State Double Proton Transfer in Lumichrome/Acetic Acid System: Theoretical and Experimental Approach. J Phys Chem A 2005; 109:11707-14. [PMID: 16366620 DOI: 10.1021/jp053951d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Experimental time-resolved spectral and photon counting kinetic results confirm formation of an isoalloxazinic excited state via excited-state double proton transfer (ESDPT) catalyzed by a carboxylic acid molecule that forms a hydrogen-bond complex with the parent alloxazine molecule. This isoalloxazinic tautomer manifests itself as a distinct long-lived emissive species formed only in such alloxazine derivatives that were not substituted at the N1 nitrogen atom, being a product of the excited-state reaction occurring from the alloxazinic excited state. Theoretical calculations support the idea that the ESDPT occurs by the concerted mechanism. The calculated activation barrier in the excited state is much lower than the same barrier in the ground state and even disappears for the HOMO-1 to LUMO excitation, which explains the fact that the reaction takes place in the excited-state only. The reaction rate estimated from the emission kinetics is ca. 1.4 x 10(8) dm3 mol(-1) s(-1) in ethanolic solutions of lumichrome with added acetic acid.
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Affiliation(s)
- Ewa Sikorska
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland
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18
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Miskolczy Z, Biczók L. Anion-induced changes in the absorption and fluorescence properties of lumichrome: A new off-the-shelf fluorescent probe. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.06.049] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Sikorska E, Khmelinskii IV, Kubicki M, Prukała W, Nowacka G, Siemiarczuk A, Koput J, Ferreira LFV, Sikorski M. Hydrogen-Bonded Complexes of Lumichrome. J Phys Chem A 2005; 109:1785-94. [PMID: 16833507 DOI: 10.1021/jp045550o] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrogen bonds were shown to play an important role in the lumichrome photophysics and photochemistry both in solutions and in the solid state. In solutions, lumichrome can form hydrogen-bonded complexes with a variety of molecules, such as acetic acid or methanol, as supported by spectral and equilibrium studies. Photoexcitation of some hydrogen-bonded complexes, having appropriate configuration, as in the case of acetic acid, may lead to excited-state proton transfer, resulting in formation of the isoalloxazinic structure, detectable by its characteristic emission, distinct from that of the intrinsically alloxazinic lumichrome. Theoretical calculations confirmed the role of the hydrogen-bonded complexes, yielding several stable eight-membered cyclic structures of such complexes characterized by spectral changes similar to those observed experimentally. Hydrogen bonds play an essential role in the formation of the lumichrome crystal structure, as follows from the X-ray diffraction results. Interestingly, the crystals studied included molecules of methanol used as solvent in crystal growth. The emission studies of polycrystalline samples, similar to the processes occurring in solutions, point to the importance of hydrogen-bonding interactions in crystal packing allowed by the symmetry of the hydrogen-bonded dimers.
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Affiliation(s)
- Ewa Sikorska
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland.
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20
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ISHIZAKA S, UEDA Y, NISHIJIMA Y, KITAMURA N. Time-Resolved Total-Internal-Reflection Fluorescence Study on Molecular Interactions at Liquid/Liquid Interfaces. BUNSEKI KAGAKU 2005. [DOI: 10.2116/bunsekikagaku.54.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Shoji ISHIZAKA
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | - Yuichi UEDA
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | | | - Noboru KITAMURA
- Division of Chemistry, Graduate School of Science, Hokkaido University
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Sikorska E, Khmelinskii IV, Williams SL, Worrall DR, Herance JR, Bourdelande JL, Koput J, Sikorski M. Spectroscopy and photophysics of 6,7-dimethyl-alloxazine: experimental and theoretical study. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2004.04.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Sikorska E, Khmelinskii IV, Koput J, Sikorski M. Electronic structure of lumiflavin and its analogues in their ground and excited states. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2004.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Sikorska E, Khmelinskii IV, Bourdelande JL, Bednarek A, Williams SL, Patel M, Worrall DR, Koput J, Sikorski M. Spectroscopy and photophysics of mono methyl-substituted alloxazines. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2004.03.005] [Citation(s) in RCA: 19] [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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24
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Sikorska E, Khmelinskii IV, Prukała W, Williams SL, Patel M, Worrall DR, Bourdelande JL, Koput J, Sikorski M. Spectroscopy and Photophysics of Lumiflavins and Lumichromes. J Phys Chem A 2004. [DOI: 10.1021/jp037048u] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ewa Sikorska
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Igor V. Khmelinskii
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Wiesław Prukała
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Siân L. Williams
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Manisha Patel
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - David R. Worrall
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Jose L. Bourdelande
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Jacek Koput
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Marek Sikorski
- Faculty of Commodity Science, Poznań University of Economics, al. Niepodleglości 10, 60-967 Poznań, Poland, Universidade do Algarve, FCT, Campus de Gambelas, Faro 8000-117, Portugal, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK, and Unitat de Química Orgànica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
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Ishizaka S, Kitamura N. Photoinduced Redox Cycle of Riboflavin at a Water/Oil Interface. ANAL SCI 2004; 20:1587-92. [PMID: 15566154 DOI: 10.2116/analsci.20.1587] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A photoinduced redox reaction cycle of Riboflavin (RF) at a water/CCl4 interface was studied directly by means of both steady-state and time-resolved total internal reflection (TIR) fluorescence spectroscopies. The TIR fluorescence spectrum of RF observed at the water/CCl4 interface with the maximum wavelength of 517 nm was assigned to the pi-pi* transition from the excited singlet-state of the isoalloxazine chromophore in RF. Upon prolonged laser irradiation (400 nm) in the presence of N,N-dioctadecyl-[1,3,5]triazine-2,4,6-triamine (DTT) as a guest for RF in the CCl4 phase, on the other hand, a new TIR fluorescence band appeared at around 480 nm. Furthermore, the fluorescence intensity at around 480 nm increased in the presence of acetic acid in the water phase. Detailed studies demonstrated that the new fluorescence band should be ascribed to 1,5-dihydoroflavin (RFH2). The present results indicated that RFH2 was produced through the photoreaction of the RF-DTT hydrogen-bonded complex formed at the water/CCl4 interface, whose reaction mechanisms were discussed on the basis of the results observed by fluorescence spectra/dynamics measurements under the TIR conditions as well as by transient absorption spectroscopy.
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Affiliation(s)
- Shoji Ishizaka
- Division of Chemistry, Graduate School of Science, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan
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