PROBLEM TO BE SOLVED: To provide a molecular metallic oxide cluster that molecular polarization is held stably and is stable structurally.SOLUTION: A molecular metallic oxide cluster includes: cluster skeletons having inclusion parts which are provided at a continuous hole and one open end side and another open end side in the continuous hole and can include a metal ion and a water molecule; the metal ion included in one side of the inclusion part; and the water molecule included in another side of the inclusion part. The molecular metallic oxide cluster has molecular polarization by deflection of the metal ion.SELECTED DRAWING: Figure 6
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