Abstract
Metal-metal double-π bonding in s-block metals has not been reported until now. The octahedral clusters of Be2(μ2-X)4 only possessing degenerate Be-Be double-π bonds were first achieved by an innovative concerted electron-donating strategy from the vertical plane of the Be-Be midpoint using four s1-type electron-donating ligands. Moreover, this novel strategy is universal and independent of electronegativity. Three typical clusters were discussed herein including Be2(BeF)4, Be2Li4 and Be2Cu4. Especially, WBIBe-Be in Be2Li4 reached up to 1.96. The significant π-bonding character was confirmed by various bond analysis strategies.
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