Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers

@article{Nguyen2005SynthesisOA,
  title={Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers},
  author={Tailuan Nguyen and Andrew D. Sutton and Marcin Brynda and James C. Fettinger and Gary J. Long and Philip P. Power},
  journal={Science},
  year={2005},
  volume={310},
  pages={844 - 847}
}
Although in principle transition metals can form bonds with six shared electron pairs, only quadruply bonded compounds can be isolated as stable species at room temperature. Here we show that the reduction of {Cr(μ-Cl)Ar′}2 [where Ar′ indicates C6H3-2,6(C6H3-2,6-Pri2)2 and Pr indicates isopropyl] with a slight excess of potassium graphite has produced a stable compound with fivefold chromium-chromium (Cr–Cr) bonding. The very air- and moisture-sensitive dark red crystals of Ar′CrCrAr′ were… 
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