Symmetry Lab › D3h › Cyclopropenyl cation
C₃H₃⁺ Cyclopropenyl cation
Planar three-membered ring · point group D3h · order 12
- Point group
- D3h — A C3 principal axis, 3 perpendicular C2 axes and a horizontal mirror plane; these also give 3 vertical planes.
- Order
- 12
- Operations
- E, 2C₃, 3C₂, σh, 2S₃, 3σᵥ
- Shape
- Planar three-membered ring
- Atoms
- 6 (C × 3, H × 3)
Symmetry elements of C₃H₃⁺
- C₃ — perpendicular to the plane
- C₂ (1) — in the plane, through one C–H bond
- C₂ (2) — in the plane, through one C–H bond
- C₂ (3) — in the plane, through one C–H bond
- σh — the plane of the molecule
- σᵥ (1) — perpendicular to the plane; in the plane, through one C–H bond
- σᵥ (2) — perpendicular to the plane; in the plane, through one C–H bond
- σᵥ (3) — perpendicular to the plane; in the plane, through one C–H bond
- S₃ — rotate 120°, then reflect in σh
Structure
- C–C 1.36 Å, C–H 1.08 Å
- C–C–C 60°
- Two π electrons: the smallest aromatic ring
