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Could more than two atoms be bound in such a way that a π-bond is the major bonding force without involving σ-bond at all? To answer this question, we have shown that 3, 4 or 5 metal atoms can be held together by a single π-bond in the Mg 3- , NaMg 3- and Na 2 Mg 3 species. In both the NaMg 3- and Na 2 Mg 3 species, the basic structural...
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