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Three mono‐fluorinated derivatives of the flavin core system 10‐methyl‐isoalloxazine (MIA) were synthesized. Aqueous solutions of these compounds were characterized by steady‐state and time‐resolved spectroscopy. The positions for the fluorination (6, 7 and 8) were motivated by the nodal structure of the frontier orbitals of MIA. In comparison with MIA, the fluorination results in bathochromic (6F‐...