Direct synthesis of hydrogen coinserted hydrated sodium and potassium molybdenum bronzes: Their characterization and selective preparation of purple, blue, and red molybdenum bronzes

We succeeded in synthesizing the hydrogen coinserted hydrated potassium molybdenum bronzes (HKBz) with the 8- and 6-coordination structures by a direct new reduction method. By this method, the 8-coordination type was obtained. According to NMR results, the behavior of protons in the 8-coordination type was different from those in the 6-coordination type. We obtained the single phase of purple sodium molybdenum bronze when hydrogen coinserted hydrated sodium bronze (HNaBz) controlled the content of hydrogen, and sodium was heated in nitrogen. Also, we obtained the blue and red potassium bronzes by heating HKBz and controlling the contents of hydrogen and potassium. (C) 2001 Academic Press