Abstract
We present a systematic study of the effect of methyl substitution on iso- and alloxazines in acetonitrile solutions. Substitution patterns have profound effects on both spectral and photophysical properties, with fluorescence quantum yields varying by more than an order of magnitude. TD-DFT calculation were used for the first time to correlate electronic structure changes with the substitution patterns, with good agreement between calculated and theoretical band positions and oscillator strengths. Both n−π* and π −π* states in these compounds are predicted, with the oscillator strengths indicating that only the π −π* states should be observable in the absorption spectra. Substitution patterns are shown to be responsible for energy order inversion between these states.
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REFERENCES
P. S. Song and D. E. Metzler (1967). Photochemical degradation of flavins. IV. Studies of the anaerobic photolysis of riboflavin. Photochem. Photobiol. 6, 691-709.
P. F. Heelis (1982). The photophysical and photochemical properties of flavins (Isoalloxazines). Chem. Soc. Rev. 11, 15-39.
A. J. W. G. Visser and F. Muller (1979). Absorption and fluorescence studies on neutral and cationic isoalloxazines. Helv. Chim. Acta 62, 593-608.
M. Sun, T. A. Moore, and P. S. Song (1972). Molecular luminescence studies of flavins. I. The excited states of flavins. J. Am. Chem. Soc. 94, 1730-1740.
S. K. Chapman, R. N. Perham, and N. S. Scrutton (Eds.) (2002) Flavins and Flavoproteins, Rudolf Weber Agency for Scientific Publications, Berlin.
P. S. Song, M. Sun, A. KozioŁowa, and J. KozioŁ (1974). Phototautomerism of lumichromes and alloxazines. J. Am. Chem. Soc. 96, 4319-4323.
A. KozioŁowa (1979). Solvent and methyl substituent effect on phototautomerism and ionization of alloxazines. Photochem. Photobiol. 29, 459-471.
M. Kasha (1986). Proton transfer spectroscopy-Perturbation of the tautomerization potential. J. Chem. Soc., Faraday Trans. II 82, 2379-2392.
J. KozioŁ and D. E. Metzler (1972). Formation and possible structures of covalent hydrates of alloxazines. Z. Naturforsch. 27, 1027-1029.
E. Sikorska and A. KozioŁowa (1996). Excited state proton transfer of methyl-and cyano-substituted alloxazines in the presence of acetic acid. J. Photochem. Photobiol. A 95, 215-221.
E. Sikorska, M. Sikorski, R. P. Steer, F. Wilkinson, and D. R. Worrall (1998). Efficiency of singlet oxygen generation by alloxazines and isoalloxazines. J. Chem. Soc. Faraday Trans. 94, 2347-2353.
J. Komasa, J. Rychlewski, and J. Koziol (1988). Electronic-structure of alloxazine and its methyl-derivatives. J. Mol. Struct. (Theochem.) 170, 205-212.
H. Szymusiak, J. Konarski, and J. KozioŁ (1990). An INDO/S MO study of alloxazine and its monomethyl derivatives. J. Chem. Soc., Perkin Trans. 2 229-236.
J. Chastain and D. B. McCormick (1991) in F. Muller (Ed.), Chemistry and Biochemistry of Flavoenzymes, CRC Press, Boston, pp. 196-200.
O. Cunningham, M. G. Gore, and T. J. Mantle (2000). Initial-rate kinetics of the flavin reductase reaction catalysed by human biliverdin-IX beta reductase (BVR-B). Biochem. J. 345, 393-399.
H. M. Said, A. Ortiz, M. P. Moyer, and N. Yanagawa (2000). Riboflavin uptake by human-derived colonic epithelial NCM460 cells. Am. J. Physiol.-Cell Physiol. 278, C270-C276.
Z. W. Wang and C. J. Rizzo (2000). Regioselective synthesis of beta-N1-and beta-N3-alloxazine nucleosides. Organ. Lett. 2, 227-230.
R. D. Fugate and P. S. Song (1976). Lifetime study of phototautomerism of alloxazine and lumichromes. Photochem. Photobiol. 24, 479-481.
M. S. Grodowski, B. Veyret, and K. Weiss (1977). Photochemistry of flavins. II. Photoohysical properties of alloxazines and isoalloxazines. Photochem. Photobiol. 26, 341-352.
J. D. Choi, R. D. Fugate, and P. S. Song (1980). Nanosecond time-resolved fluorescence of phototautomeric lumichrome. J. Am. Chem. Soc. 102, 5293-5297.
P. F. Heelis and G. O. Phillips (1985). A laser flash-photolysis study of the triplet-states of lumichromes. J. Phys. Chem. 89, 770-774.
P. F. Heelis, B. J. Parsons, G. O. Phillips, E. J. Land, and A. J. Swallow (1985). Pulse-radiolysis study of the effect of pH on the one-electron reduction potentials of lumichrome derivatives. J. Chem. Soc., Faraday Trans. I 81, 1225-1235.
M. Sikorski, E. Sikorska, F. Wilkinson, and R. P. Steer (1999). Studies of the photophysics and spectroscopy of alloxazine and related compounds in solution and in the solid state. Can. J. Chem. 77, 472-480.
M. Sikorski, E. Sikorska, A. KozioŁowa, R. Gonzalez-Moreno, J. L. Bourdelande, R. P. Steer, and F. Wilkinson (2001). Photophysical properties of lumichromes in water. J. Photochem. Photobiol. B 60, 114-119.
M. V. Encinas, S. G. Bertolotti, and C. M. Previtali (2002). The interaction of ground and excited states of lumichrome with aliphatic and aromatic amines in methanol. Helv. Chim. Acta 85, 1427-1438.
A. KozioŁowa, H. Szymusiak, and J. KozioŁ (1993). Substituent and solvent effects on the phototautomerism of alloxazines. Pol. J. Chem. 67, 1813-1819.
J. K. Ewerg, F. Muller, A. J. W. G. Visser, C. Veeger, D. Bedelaar, and J. D. W. van Voorst (1979). Molecular luminescence of some isoalloxazines in apolar solvents at various temperatures. Photochem. Photobiol. 30, 463-471.
E. Gross, J. Dobson, and M. Petersilka (1996). Density-functional theory of time-dependent phenomena. Top. Curr. Chem. 181, 81-172.
W. Augustyniak, J. Koput, A. Maciejewski, M. Sikorski, R. P. Steer, and M. Szymñski (1993). Transient effect in fluorescence quenching of S2-xanthione by 3,3-diethylpentane in perfluoroalkane solvent-A steady-state and dynamic approach. Pol. J. Chem. 67, 1409-1423.
D. R. James, A. Siemiarczuk, and W. R. Ware (1992). Stroboscopic optical boxcar technique for the determination of fluorescence lifetimes. Rev. Sci. Instrum. 63, 1710-1716.
C. Neiss, P. Saalfrank, M. Parac, and S. Grimme (2003). Quantum chemical calculation of excited state of flavin-related molecules. J. Phys. Chem. A 107, 140-147.
C. B. Martin, X. F. Shi, M. L. Tsao, D. Karweik, J. Brooke, C. M. Hadad, and M. S. Platz (2002). The photochemistry of riboflavin tetraacetate and nucleosides. A study using density functional theory, laser flash photolysis, fluorescence, UV-;Vis, and time resolved infrared spectroscopy. J. Phys. Chem. B 106, 10263-10271.
C. B. Martin, M. L. Tsao, C. M. Hadad, and M. S. Platz (2002). The reaction of triplet flavin with indole. A study of the cascade of reactive intermediates using density functional theory and time resolved infrared spectroscopy. J. Am. Chem. Soc. 124, 7226-7234.
J. Rodriguez-Otero, E. Martinez-Nunez, A. Pena-Gallego, and S. A. Vazquez (2002). The role of aromaticity in the planarity of lumiflavin. J. Org. Chem. 67, 6347-6352.
E. Sikorska, I. V. Khmelinskii, D. R. Worrall, S. L. Williams, R. Gonzalez-Moreno, J. L. Bourdelande, J. Koput, and M. Sikorski (2004). Photophysics of 1-methyllumichrome. J. Photochem. Photobiol. A-Chem. (In press).
R. J. Platenkamp, M. H. Palmer, and A. J. W. G. Visser (1987). Ab-initio molecular-orbital studies of closed shell flavins. Eur. Biophys. J. 14, 393-402.
A. D. Becke (1993). Density-functional thermochemistry. III. The role of exact exchange. J. Chem. Phys. 98, 5648-5652.
R. Ditchfield, W. J. Hehre, and J. A. Pople (1971). Self-consistent molecular orbital methods. IX. An extended Gaussian-type basis for molecular orbital studies of organic molecules. J. Chem. Phys. 54, 724.
M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, V. G. Zakrzewski, A. J., Jr Montgomery, R. E. Stratmann, J. C. Burant, S. Dapprich, J. M. Millam, A. D. Daniels, K. N. Kudin, M. C. Strain, O. Farkas, J. Tomasi, V. Barone, M. Cossi, R. Cammi, B. Mennucci, C. Pomelli, C. Adamo, S. Clifford, J. Ochterski, G. A. Petersson, P. Y. Ayala, Q. Cui, K. Morokuma, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. Cioslowski, J. V. Ortiz, B. B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. Gomperts, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, C. Gonzalez, M. Challacombe, P. M. W. Gill, B. Johnson, W. Chen, M. W. Wong, J. L. Andres, C. Gonzalez, M. Head-Gordon, E. S. Replogle, and J. A. Pople (2002). Gaussian 98, revision A.11.3., Gaussian, Inc., Pittsburg, PA.
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Sikorska, E., Khmelinskii, I.V., Worrall, D.R. et al. Spectroscopy and Photophysics of Iso- and Alloxazines: Experimental and Theoretical Study. Journal of Fluorescence 14, 57–64 (2004). https://doi.org/10.1023/B:JOFL.0000014660.59105.31
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DOI: https://doi.org/10.1023/B:JOFL.0000014660.59105.31