Science 4 November 2005:
Vol. 310. no. 5749, pp. 844 - 847
"Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers "
Tailuan Nguyen, Andrew D. Sutton, Marcin Brynda, James C. Fettinger, Gary J. Long, Philip P. Power
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http://dx.doi.org/10.1126/science.1116789