David Nissenbaum’s favorite structure is:

Chromium(i)-terphenyl dimer

Cr(i)-terphenyl

Source: Science 310, 844 (2005); Tailuan Nguyen et al.

Why?

The Chromium(i)-terphenyl dimer is the first quintuply-bonded compound to have been synthesized. Pushing the boundaries of chemistry is always crucial and these are intricate electronic-transfer systems. This also reported a metal-carbon "interaction" between the chromium center and the carbon on the opposite side of the metal-metal bond.—David Nissenbaum

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