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Nature Chemistry (22 August 2008) | doi:10.1038/nchem.54

Metal|[ndash]|metal bonds: Shorter and shorter

Neil Withers

Bonding is at the very heart of chemistry and understanding the complexities and breadth of bonds is of great interest to a variety of chemists. Extremely high-order bonds have been observed to exist between metal atoms: quadruple- and quintuple-bonded species, for example.