Ar'-Cr-Cr-Ar':
bis(η1-2,6-bis(2,6-Di-isopropylphenyl)phenyl)-di-chromium(I)

A molecule with a Quintuple Bond

Notes: note our program can't show it as a quintuple bond
.....it looks like a single bond
Other notes:
  1. decomposes above 200 deg.C
  2. dark red
  3. extremely air- and moisture-sensitive

    4. Reference: CCDC: PAZBOI: Nguyen, T., Sutton, A.D., Brynda, M.,
    Fettinger, J. C., Long, G. J., Power, P. P,; Science, Vol 310, 2005, p. 844-847.