Symmetry Lab › D8h › Uranocene
U(C₈H₈)₂ Uranocene
Sandwich of two planar C₈H₈ rings, eclipsed · point group D8h · order 32
- Point group
- D8h — A C8 principal axis, 8 perpendicular C2 axes and a horizontal mirror plane; these also give 8 vertical planes and a centre of inversion.
- Order
- 32
- Operations
- E, 2C₈, 2C₈³, 2C₄, C₂, 4C₂′, 4C₂″, i, 2S₈, 2S₈³, 2S₄, σh, 4σᵥ, 4σd
- Shape
- Sandwich of two planar C₈H₈ rings, eclipsed
- Atoms
- 33 (U, C × 16, H × 16)
Symmetry elements of U(C₈H₈)₂
- C₈ — through the metal and both ring centres; also C₄, C₂, S₈
- C₂′ (1) — through one carbon of each ring
- C₂′ (2) — through one carbon of each ring
- C₂′ (3) — through one carbon of each ring
- C₂′ (4) — through one carbon of each ring
- C₂″ (1) — through one C–C bond midpoint of each ring
- C₂″ (2) — through one C–C bond midpoint of each ring
- C₂″ (3) — through one C–C bond midpoint of each ring
- C₂″ (4) — through one C–C bond midpoint of each ring
- i — centre of inversion
- σh — through the metal, parallel to the rings
- σᵥ (1) — contains the axis; through one carbon of each ring
- σᵥ (2) — contains the axis; through one carbon of each ring
- σᵥ (3) — contains the axis; through one carbon of each ring
- σᵥ (4) — contains the axis; through one carbon of each ring
- σd (1) — contains the axis; through one C–C bond midpoint of each ring
- σd (2) — contains the axis; through one C–C bond midpoint of each ring
- σd (3) — contains the axis; through one C–C bond midpoint of each ring
- σd (4) — contains the axis; through one C–C bond midpoint of each ring
- S₈ — rotate 45°, then reflect in σh
- S₄ — rotate 90°, then reflect in σh
Structure
- U–C 2.65 Å, C–C 1.40 Å
- Both rings planar and aromatic (10 π electrons each)
- The f-block analogue of ferrocene
