- Point group
- D2h — A C2 principal axis, 2 perpendicular C2 axes and a horizontal mirror plane; these also give 2 vertical planes and a centre of inversion.
- Order
- 8
- Operations
- E, C₂(z), C₂(y), C₂(x), i, σ(xy), σ(xz), σ(yz)
- Shape
- Planar
- Atoms
- 6 (C × 2, O × 4)
Symmetry elements of C₂O₄²⁻
- C₂ (z) — perpendicular to the molecular plane
- C₂ (y) — in the molecular plane
- C₂ (x) — in the molecular plane
- i — centre of inversion
- σ (xy) — the plane of the molecule
- σ (xz) — perpendicular to the molecule
- σ (yz) — perpendicular to the molecule
Structure
- C–C 1.57 Å, C–O 1.25 Å (all equal)
- O–C–O 125°
- Charge −2, delocalised over both CO₂ ends
Other D2h molecules
trans-[PtCl₂(NH₃)₂]trans-Platin (N atoms shown)N₂O₄Dinitrogen tetroxideC₂H₄Ethylene (ethene)C₂F₄TetrafluoroethyleneC₂H₂N₄1,2,4,5-TetrazineAl₂Cl₆Aluminium chloride dimerB₂H₆DiboraneI₂Cl₆Iodine trichloride dimerC₄H₄N₂PyrazineC₆H₄O₂p-BenzoquinoneC₆H₄Br₂ (para)p-DibromobenzeneC₆H₄Cl₂ (para)p-Dichlorobenzene