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The existence of two directly bonded zinc atoms demonstrates that the [Zn\uf8ffZn]<jats:sup>2+<\/jats:sup> unit, the lightest Group\u200512 homologue of the well\u2010known [Hg\uf8ffHg]<jats:sup>2+<\/jats:sup> ion, can be stabilized by appropriate ligands. Activity in this area has increased enormously in the few years since the determination of the structure of this molecule. Numerous theoretical studies have been devoted to the investigation of the electronic, structural, and spectroscopic properties of this and related compounds, and new metal\u2013metal coordination and organometallic compounds of zinc, cadmium, and mercury have been synthesized and structurally characterized. 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