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Jana R, Gautam RK, Bapli A, Seth D. Photodynamics of biological active flavin in the presence of zwitterionic surfactants. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 264:120304. [PMID: 34464918 DOI: 10.1016/j.saa.2021.120304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/16/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
In the flavin family of photoactive biomolecules, lumichrome (LM) is a very important compound. It contains a tri-cyclic structure with methyl groups at two sides. It formed by the partial decomposition and biodegradation of riboflavin in both acidic as well as in neutral medium. Herein, we have studied the photophysical properties of LM in the presence of two zwitterionic surfactants, namely dodecyldimethyl(3-sulfopropyl) ammonium hydroxide inner salt (DSB), and tetradecyldimethyl(3-sulfopropyl) ammonium hydroxide inner salt (TSB), having the same head group but a different tail part. We have used steady-state absorption, fluorescence emission, and time-resolved fluorescence emission measurements. We observed that in the presence of zwitterionic surfactant aggregates LM shows excitation and emission wavelength dependent emission properties, which demonstrate the structural changes that take place from one form to another prototropic form of LM molecule. The higher rotational relaxation time of LM in the case of DSB compared to TSB demonstrated that LM is facing more rigid environment in DSB micelles compared to TSB micelles.
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Affiliation(s)
- Rabindranath Jana
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801103, Bihar, India
| | - Rajesh Kumar Gautam
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801103, Bihar, India
| | - Aloke Bapli
- 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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Haj Hassani Sohi T, Maass F, Czekelius C, Suta M, Vasylyeva V. Co-crystallization of organic chromophore roseolumiflavin and effect on its optical characteristics. CrystEngComm 2022. [DOI: 10.1039/d2ce00589a] [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
Three roseolumiflavin co-crystals are designed to elucidate the accessibility of flavins for the targeted tuning of luminescence in the solid state.
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Affiliation(s)
- Takin Haj Hassani Sohi
- Laboratory for Molecular Crystal Engineering, Department of Inorganic Chemistry and Structural Chemistry I, Heinrich-Heine-University Duesseldorf, Universitaetstr. 1, 40225 Duesseldorf, Germany
| | - Felix Maass
- Laboratory for Molecular Crystal Engineering, Department of Inorganic Chemistry and Structural Chemistry I, Heinrich-Heine-University Duesseldorf, Universitaetstr. 1, 40225 Duesseldorf, Germany
| | - Constantin Czekelius
- Laboratory for Asymmetric Synthesis and Catalysis, Department of Organic Chemistry and Macromolecular Chemistry, Heinrich-Heine-University Duesseldorf, Universitaetstr. 1, 40225 Duesseldorf, Germany
| | - Markus Suta
- Laboratory for Inorganic Photoactive Materials, Department of Inorganic Chemistry and Structural Chemistry II, Heinrich-Heine-University Duesseldorf, Universitaetstr. 1, 40225 Duesseldorf, Germany
| | - Vera Vasylyeva
- Laboratory for Molecular Crystal Engineering, Department of Inorganic Chemistry and Structural Chemistry I, Heinrich-Heine-University Duesseldorf, Universitaetstr. 1, 40225 Duesseldorf, Germany
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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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Jana R, Maity B, Seth D. Structural transition dynamics of biologically active flavins in alkylglucoside surfactants aggregates. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 224:117346. [PMID: 31344577 DOI: 10.1016/j.saa.2019.117346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 06/24/2019] [Accepted: 07/07/2019] [Indexed: 06/10/2023]
Abstract
The photophysics and structural transition dynamics of a bio-active flavin lumichrome (LM) entrapped in two sugars based neutral surfactants were reported. Sugar-based surfactants, which were used for research purpose are potential environmentally friendly, green alternative amphiphilic surface active substance compared to other kinds of common surfactants. Here, two alkyl glucoside surfactants n-octyl-β-D-glucopyranoside (OBG) and n-octyl-β-D-thioglucopyranoside (OBTG) were used. This work is carried out by using steady-state absorption and fluorescence emission spectroscopy along with time-resolved fluorescence emission techniques. Photophysics of LM was modulated several folds in these two sugar-based neutral micelles. LM exhibits excitation and emission wavelength dependent fluorescence properties in these two sugars based neutral micelles. LM confined in the micellar environments exhibited structural transition dynamism, i.e. different kinds of conformers are equilibrated. Herein, different conformers of LM are identified and explained with the help of spectroscopic methods. From the fluorescence anisotropy measurement, it was found that the rotational relaxation time of LM in OBG micelle was more compared to that in OBTG micelle, which indicates that the LM molecule faced much more constrained environment in OBG micellar media.
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Affiliation(s)
- Rabindranath Jana
- 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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7
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Abstract
Steady-state and time-resolved UV-vis spectroscopies were used to study the photoprotolytic properties of lumazine, which belongs to a class of biologically important compounds-the petridines. We found that in water an excited-state proton transfer occurs with a time constant of ∼70 ps and competes with a nonradiative rate of about the same value. The nonradiative rate of the protonated form of lumazine in polar and nonpolar solvents is large knr ≥ 1.5 × 1010s-1. The fluorescence properties indicate that in water, the ground-state neutral form of lumazine is already stable in two tautomeric forms. The fluorescence of the deprotonated form is quenched by protons in acidic solutions with a diffusion-controlled reaction rate. We conclude that the neutral form of lumazine is an irreversible mild photoacid.
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Affiliation(s)
- Ron Simkovitch
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University , Tel Aviv 69978, Israel
| | - Dan Huppert
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University , Tel Aviv 69978, Israel
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Penzkofer A. Absorption and emission spectroscopic investigation of alloxazine in aqueous solutions and comparison with lumichrome. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.08.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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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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Vieira Ferreira LF, Costa AI, Ferreira Machado I, Botelho do Rego AM, Sikorska E, Sikorski M. Surface photochemistry: alloxazine within nanochannels of Na+ and H+ ZSM-5 zeolites. Phys Chem Chem Phys 2009; 11:5762-72. [DOI: 10.1039/b903013a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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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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Prukała D, Prukała W, Koczorowski R, Khmelinskii IV, Sikorska E, Sikorski M. Electron ionisation and electrospray ionisation mass spectrometric study of a series of isomeric methyl-, dimethyl- and trimethylalloxazines. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:409-416. [PMID: 18183634 DOI: 10.1002/rcm.3378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Electron ionisation (EI) mass spectra and electrospray ionisation (ESI) mass spectra at different cone voltages of a series of isomeric methyl- and dimethylalloxazines are discussed, and compared with those of lumichrome, and 1- and 3-methyllumichrome. Examination of ESI mass spectra taken at a higher cone voltage and the use of isotope-labelled methanol allow us to discuss the fragmentation pathways of [M+H]+ and [M-H](-) ions. The fragmentation pathways of all of the compounds and the characteristic fragment ions formed in EI-MS are compared with published data. The influence of methyl and dimethyl substituents in the benzene ring on the fragmentation pathways leading to the loss of 43 and 45 Da upon both electron and electrospray ionisation is described.
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Affiliation(s)
- Dorota Prukała
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.
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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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Dispersive kinetic of fluorescence decay of alloxazines adsorbed into cellulose. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.04.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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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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Kwon HC, Kim KR, Zee SD, Cho SY, Lee KR. A new indolinepeptide fromPaecilomyces sp. J300. Arch Pharm Res 2004; 27:604-9. [PMID: 15283460 DOI: 10.1007/bf02980157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A new indolinepeptide (3) was isolated, together with two known compounds, a cerebroside (1) and an alloxazine (2), from silkworm larvae infected with Paecilomyces sp. J300. On the basis of spectroscopic data, their structures were elucidated as (4E, 8E, 2S, 2'R, 3R)-N-2'-hydroxyhexadecanoyl-1-O-beta-D-glucopyranosyl-9-methyl-4, 8-sphingadienine (1), 7,8-dimethylalloxazine (2) and 3beta,5-dihydroxy-1-N-methyl-indoline-2beta-carbonyl amino-D-alanyl-erythro-beta-hydoxyisoleucinyl-glycine (3).
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Affiliation(s)
- Hak Cheol Kwon
- Natural Products Laboratory, College of Pharmacy, SungKyunKwan University, Suwon 440-746, Korea
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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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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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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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Sikorska E, Khemlinskii IV, Worrall DR, Williams SL, Gonzalez-Moreno R, Bourdelande JL, Koput J, Sikorski M. Photophysics of 1-methyllumichrome. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/s1010-6030(03)00353-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sikorska E, Szymusiak H, Khmelinskii IV, Koziołowa A, Spanget-Larsen J, Sikorski M. Spectroscopy and photophysics of alloxazines studied in their ground and first excited singlet states. J Photochem Photobiol A Chem 2003. [DOI: 10.1016/s1010-6030(03)00104-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sikorski M, Sikorska E, Khmelinskii IV, Gonzalez-Moreno R, Bourdelande JL, Siemiarczuk A. Photophysics of lumichrome on cellulose. J Photochem Photobiol A Chem 2003. [DOI: 10.1016/s1010-6030(02)00427-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Sikorski M, Sikorska E, Khmelinskii IV, Gonzalez-Moreno R, Bourdelande JL, Siemiarczuk A. Photophysics of alloxazines on cellulose. Photochem Photobiol Sci 2002; 1:715-20. [PMID: 12665311 DOI: 10.1039/b205452c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the UV-Vis absorption, fluorescence and transient absorption spectra of selected methylalloxazines adsorbed on cellulose from a polar solvent. The ground-state properties of these probe molecules in the cellulose matrix are similar to those in polar protic solvents. Fluorescence decay data allowed identification of three emitting species for every molecule studied, excluding 1-methyllumichrome which lacks the capacity to rearrange into an isoalloxazinic form. The short-lived emission component was attributed to the neutral form of the molecule, and the two longer-lived components were assigned to the two distinct deprotonated monoanionic forms resulting from dissociation at the respective N(3) and N(1) nitrogen atoms. The two monoanions coexist due to their very similar pKa, values. Transient absorption experiments detected two species created by the laser pulse in these systems. The short-lived species was identified as the triplet excited state, and the long-lived species as the semireduced radical, formed by hydrogen atom or proton transfer from the glycosidic unit to the alloxazine carbonyl group.
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Affiliation(s)
- Marek Sikorski
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.
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Photophysics of methyl substituted alloxazines in water: efficiency of singlet oxygen generation. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(01)00651-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sikorski M, Sikorska E, Koziolowa A, Gonzalez Moreno R, Bourdelande JL, Steer RP, Wilkinson F. Photophysical properties of lumichromes in water. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2001; 60:114-9. [PMID: 11470567 DOI: 10.1016/s1011-1344(01)00134-8] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The photophysics of lumichrome, 1-methyllumichrome, and lumiflavin in water solutions have been investigated. Fluorescence lifetimes of 2.7 and 2.2 ns were observed for lumichrome and 1-methyllumichrome, respectively, the corresponding triplet state lifetimes of 17 and 18 micros have been obtained from the transient absorption spectra. Evidence for long lived species with absorption maxima near 450 nm and lifetimes of ca. 400 micros has been found in the transient absorption spectra of both lumichromes. Quantum yields for the sensitised production of singlet oxygen, phi(Delta), are 0.36 and 0.41 for lumichrome and 1-methyllumichrome, respectively, in D(2)O.
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Affiliation(s)
- M Sikorski
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780, Poznan, Poland.
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