Hydrogen insertion on alkali metal decamolybdates by spillover

A hydrogen-insertion process by spillover on alkali metal decamolybdates wa s investigated in situ. Hydrogens were inserted, leading to the formation o f OH groups. The insertion induced dehydration (release of the crystallizat ion water of the molybdates), which resulted in distortions in the Mo-O fra mework. The dehydration behaviour varied depending on the kinds of decamoly bdates or the manners in which the decamolybdates have crystallization-wate r species. Furthermore, structural changes of the resultant compounds with heat-treatments in N-2 were also investigated. It was then confirmed that t hese compounds could become starting materials, leading to the formation of alkali metal molybdenum bronzes at lower temperatures, ca. 200 K below tho se used in ordinary syntheses.