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由四核平面双帽［Ｍ４Ｅ２］型及单帽［Ｍ４Ｅ］型簇合物构型应满足的几何条件，得到判断有无Ｍ－Ｍ键存在的关系式Ｄ＝［０．９２（ＲＭ＋ＲＥ）］２－２Ｒ２Ｍ，并给出形成［Ｍ４Ｅ２］及［Ｍ４Ｅ］型簇合物时金属原子Ｍ和四重桥帽原子Ｅ点应满足的半径关系分别为ＲＥ≥１２ＲＭ和ＲＥ≥０．４１４ＲＭ。
The geometry D = [0.92 (RM + RE)] for judging the presence or absence of M-M bond was obtained from the geometrical conditions that should be satisfied by the configuration of the tetrapod double cap [M4E2] 2-2R2M, and given the formation of [M4E2] and [M4E] type cluster when the metal atom M and quadruple bridge cap atom E point should meet the radius of RE ≧ 12RM and RE ≧ 0.414RM.