IUCr journals

Bis(η5-pentamethylcyclopentadienyl)cobalt(II)

Acta Cryst. (2009). E65, m391 (doi.org/10.1107/S1600536809007971)

[Decamethylcobaltocene]
Decamethylcobaltocene (CoCp*2) is a widely used reducing agent that is of fundamental importance to the organometallic community, but surprisingly its crystal structure has not been reported in the literature. High-quality yellow-brown crystals were grown from a cold saturated solution in hexamethyldisiloxane, yielding a structure that is isomorphous with FeCp*2 and the low-temperature polymorph of MnCp*2. The CoCp*2 molecule lies in a crystallographic 2/m position that is consistent with its inversion symmetry and staggered cyclopentadienyl rings.

M.M. Clark, W.W. Brennessel and P.L. Holland