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利用还原－氧化重构法（简称ＲＯＲ法）合成了具有Ｓｔｒａｎｄｂｅｒｇ型含硒的杂多化合物Ｋ_３Ｎａ·［Ｓｅ_２Ｍｏ_５Ｏ_（２１）］·２Ｈ_２Ｏ的单晶，结构测定表明，此化合物属单斜晶系，阴离子包含通过共边和共顶点相连的五聚ＭｏＯ_６八面体，组成八面体的５个金属原子近似形成五角平面骨架，２个ＳｅＯ_３三角锥加在五角平面的上下方。
The crystal structure of the single crystal with K3Na · [Se2Mo5O_ (21)] · 2H_2O with Strandberg-type selenium was synthesized by the reductive-oxidative recombination method (abbreviated as ROR method). The results show that this compound is monoclinic, It consists of pentameric MoO_6 octahedra connected by a common edge and a total of vertexes. Five metal atoms forming an octahedron approximate a pentagonal plane skeleton, and two SeO_3 triangular pyramids are added above and below a pentagonal plane.