A new metal-coordinative flavin (2, 4, 7-trimethylquino [8, 7-g] pteridine-9, 11 (7H, 10H)- dione:(1)) which has a phenanthroline-like skeleton within the molecular structure was synthesized. Being different from conventinal flavins, the new flavin showed a significant affinity toward metal ions and the absorption spectra were sensitively affected by added metal ions. The spectral patterns were classified into three types, which were assigned ...
