| [Co(C5H5)(C2H11B9)] | F(000) = 520 |
| Mr = 256.42 | Dx = 1.367 Mg m−3 |
| Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
| a = 12.4903 (11) Å | Cell parameters from 9899 reflections |
| b = 8.7207 (7) Å | θ = 2.9–33.8° |
| c = 12.7392 (12) Å | µ = 1.34 mm−1 |
| β = 116.123 (4)° | T = 100 K |
| V = 1245.86 (19) Å3 | BLOCK, yellow |
| Z = 4 | 0.46 × 0.44 × 0.16 mm |