Symmetry Lab › C2h › Oxalic acid (planar, trans)
H₂C₂O₄ Oxalic acid (planar, trans)
Planar · point group C2h · order 4
- Point group
- C2h — A C2 rotation axis and a horizontal mirror plane perpendicular to it, which together give a centre of inversion.
- Order
- 4
- Operations
- E, C₂, i, σh
- Shape
- Planar
- Atoms
- 8 (C × 2, O × 4, H × 2)
Symmetry elements of H₂C₂O₄
- C₂ — perpendicular to the plane, through the C–C midpoint
- i — centre of inversion
- σh — the plane of the molecule
Structure
- C–C 1.54 Å, C=O 1.21 Å, C–O 1.31 Å
- Planar; the two COOH groups trans
- Intramolecular O–H···O contacts
