## Abstract

$\pi$-Cyclopentadienyl 1-phenylcyclopentadiene cobalt crystallizes as orthorhombic needles with a = 29$\cdot$64 $\pm$ 0$\cdot$04 $\overline{\circ}{\mathrm A}$, b = 7$\cdot$70 $\pm$ 0$\cdot$01 $\overline{\circ}{\mathrm A}$, c = 10$\cdot$68 $\pm$ 0$\cdot$02 $\overline{\circ}{\mathrm A}$; the space group is Pbca. A three-dimensional single-crystal Fourier and least-squares analysis has converged R to 0$\cdot$089 for the 815 independent reflexions. $\sigma$- and $\pi$-bonding from the cyclopentadiene ligand to the cobalt ion is evidenced by the conformation of the ligand together with the detailed carbon-carbon bond lengths (average e.s.d. 0$\cdot$03 $\overline{\circ}{\mathrm A}$. The phenyl group occupies the exo-position rather than the endo-site suggested by spectroscopic techniques. The crystal packing is also discussed.

## Royal Society Login

Sign in for Fellows of the Royal Society

Fellows: please access the online journals via the Fellows’ Room

### Log in using your username and password

### Log in through your institution

Pay Per Article - You may access this article or this issue (from the computer you are currently using) for 30 days.

Regain Access - You can regain access to a recent Pay per Article or Pay per Issue purchase if your access period has not yet expired.