Symmetry Lab › D2h › Dinitrogen tetroxide
N₂O₄ Dinitrogen tetroxide
Planar · point group D2h · order 8
- 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 (N × 2, O × 4)
Symmetry elements of N₂O₄
- 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
- N–N 1.782 Å (long and weak), N–O 1.19 Å
- O–N–O 134°
- Colourless; splits into two brown NO₂ on warming
