| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Research Abstract |
This research aimed at (1) establishment of a novel and useful synthetic route for molybdenum giant clusters, which route would broaden the application field of the giant clusters, (2) syntheses of novel compounds of the giant clusters with various metal cations, and (3) development of new applications of the giant clusters.
In order to achieve the aim we first tried to establish a novel preparation route of molybdenum giant cluster solution, which solution contained no impediment species, such as alkali metal counter cation or reaction residue due to preparation procedures, and would thus become comfortable for broadened applications of the giant clusters. The route could be established by combining an ion-exchange technique and a reducing reaction with proton on noble metal (H/Pd or H/Pt).
We then tried to prepare novel compounds of the giant clusters from the giant cluster solution obtained by the above method. Various compounds were successfully synthesized by adding desired metal cations to the solution. For some of them the crystal structures were determined by single crystal XRD analysis. The determination revealed the existence of a novel lacunary type of {Mo154} cluster with elliptic distortion. This finding might be of importance for material construction, which uses giant cluster species as building blocks.
Furthermore, we tried to apply the amorphous character of the giant clusters, which results from difficulties of positioning extremely large species into a highly ordered state, to preparation of compositionally well-controlled homogeneous mixtures, which are suitable for a starting material of low temperature syntheses. We could confirm that the amorphous mixtures prepared from the giant cluster solution provided various kinds of functional materials at lower temperatures.
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