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Song PS, Moore TA, Kurtin WE. Molecular luminescence studies of flavins. II. Interactions involving the excited states. ZEITSCHRIFT FUR NATURFORSCHUNG. TEIL B. ANORGANISCHE CHEMIE, ORGANISCHE CHEMIE, BIOCHEMIE, BIOPHYSIK, BIOLOGIE 1972; 27:1011-5. [PMID: 4405062 DOI: 10.1515/znb-1972-0901] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The effects of experimental geometry on the theoretical polarizations of the S1 ← S0 and S2 ← S0 bands of π→π* type in riboflavin have been examined. Polarizations of these two bands are characterized by an angle between them in the range of 20—28° and are relatively insensitive to the input geometry. Thus the predicted polarizations are generally in agreement with fluorescence polarization spectrum of riboflavin at 77°K. Alloxazine forms a strong complex with KI, and the fluorescence and phosphorescence from the charge transfer states have been characterized by means of luminescence and photoselection measurements. Riboflavin did not form a strong complex with KI, but it forms aggregates (dimer) more readily than alloxazine. The excited states of flavins can be populated by the weak dipole-dipole coupling mechanism of energy transfer from 1La states of indoles to the S2 state of flavins. The measured critical distances estimated from the fluorescence depolarization experiments range from 31 Å for indole to 40 A for indole-2-carboxylic acid in glycerol-methanol mixture (9:1) at 263°K.
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Sun M, Moore TA, Song PS. Molecular luminescence studies of flavins. I. The excited states of flavins. J Am Chem Soc 1972; 94:1730-40. [PMID: 5015676 DOI: 10.1021/ja00760a052] [Citation(s) in RCA: 225] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Song PS, Harter ML, Moore TA, Herndon WC. Luminescence spectra and photocycloaddition of the excited coumarins to DNA bases. Photochem Photobiol 1971; 14:521-30. [PMID: 5124622 DOI: 10.1111/j.1751-1097.1971.tb06191.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Song PS, Gordon WH. A spectroscopic study of the excited states of coumarin. THE JOURNAL OF PHYSICAL CHEMISTRY 1970; 74:4234-40. [PMID: 5487628 DOI: 10.1021/j100718a010] [Citation(s) in RCA: 108] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Song PS, Herndon WC, Feuer J. A perturbational molecular orbital treatment of flavin--purine complexes. Arch Biochem Biophys 1970; 136:574-6. [PMID: 5435445 DOI: 10.1016/0003-9861(70)90229-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Moore TA, Song PS. A model for biological quantum conversion involving the photooxidative dephosphorylation of menadiol diphosphate. Photochem Photobiol 1969; 10:13-22. [PMID: 5807067 DOI: 10.1111/j.1751-1097.1969.tb07216.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Song PS. Electronic structures and spectra of flavins: an improved Pariser-Parr-Pople Mo and semiempirical unrestricted Hartree-Fock computations. Ann N Y Acad Sci 1969; 158:410-23. [PMID: 4308074 DOI: 10.1111/j.1749-6632.1969.tb56234.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Song PS. The nature of the intramolecular complex of flavin adenine dinucleotide (FAD). J Am Chem Soc 1969; 91:1850-2. [PMID: 5779833 DOI: 10.1021/ja01035a044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Kurtin WE, Song PS. Photochemistry of the model phototropic system involving flavins and indoles. I. Fluorescence polarization and MO calculations of the direction of the electronic transition moments in flavins. Photochem Photobiol 1968; 7:263-73. [PMID: 5648241 DOI: 10.1111/j.1751-1097.1968.tb08015.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Song PS, Moore TA. Photodephosphorylation of menadiol diphosphate: a model for biological quantum conversion. Photochem Photobiol 1968; 7:113-6. [PMID: 5638037 DOI: 10.1111/j.1751-1097.1968.tb05836.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Song PS, Metzler DE. Photochemical degradation of flavins. IV. Studies of the anaerobic photolysis of riboflavin. Photochem Photobiol 1967; 6:691-709. [PMID: 4293497 DOI: 10.1111/j.1751-1097.1967.tb08735.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Anderson JA, Song PS. Borohydride reduction of aspartate aminotransferase and model compounds. Arch Biochem Biophys 1967; 122:224-36. [PMID: 6076219 DOI: 10.1016/0003-9861(67)90143-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Kurtin WE, Latino MA, Song PS. A study of photochemistry of flavins in pyridine and with a donor. Photochem Photobiol 1967; 6:247-59. [PMID: 6041620 DOI: 10.1111/j.1751-1097.1967.tb08812.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Song PS. On the mechanism of the cation- and substrate analog-activated enzyme reaction: glucosamine-6-phosphate deaminase. EXPERIENTIA 1964; 20:211. [PMID: 5854163 DOI: 10.1007/bf02135406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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