Abstract
It has been found that 2,6-diamidopyridine derivatives act as flavin receptors by a triple hydrogen bond towards a uracil moiety of an isoalloxazine ring in CHCl3. The association constants were determined by 1H NMR (in CDCl3) and fluorescence (in CHCl3) spectroscopies; the largest is ca.103 mol–1 dm3. The triple hydrogen bond toward C(2)O, N(3)–H and C(4)O of the isoalloxazine ring was found to enhance slightly the oxidation activity in CHCl3.
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