Abstract
Structural parameters of the flavomononucleotide (FMN) dimer in water and glycerin-water solution have been established on the basis of spectroscopic studies and the Kasha theory. A parallel-plane dimer model is proposed, in which the monomer units are arranged face to face. For the FMN dimer in water, the distance between the planes of monomer units is equal to R = 3.5 ± 0.3 A ̊ , and the angle α 1 ( ∢ ( M I M I ′ )) between the moments of transition S 1 → S 0 (absorption band I) and the angle α II ( ∢ ( M II M II ′) ) between the moments of transition S 2 → S 0 (band II) of monomer units are equal to α 1 = 71 ± 4° and α II = 0 ± 4°, respectively. From the mentioned orientation of absorption transition moments of FMN monomer units in the dimer, a conclusion may be drawn that the angel, φ, between the transition moments S 1 → S 0 and S 2 → S 0 is equal to 36 ± 4°. This orientation is consistent with the results of Johansson obtained for FMN molecules in lamellar liquid crystals. Similar R, α I and α II values were obtained for the FMN dimer in the water-glycerin solution.
Published Version
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