Symmetry Lab › D3h › Nonahydridorhenate(VII) ion
[ReH₉]²⁻ Nonahydridorhenate(VII) ion
Tricapped trigonal prism · 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
- Tricapped trigonal prism
- Atoms
- 10 (Re, H × 9)
Symmetry elements of [ReH₉]²⁻
- C₃ — perpendicular to the plane
- C₂ (1) — through one capping H and the midpoint of the opposite prism edge
- C₂ (2) — through one capping H and the midpoint of the opposite prism edge
- C₂ (3) — through one capping H and the midpoint of the opposite prism edge
- σh — the plane of the molecule
- σᵥ (1) — perpendicular to the plane; through one capping H and the midpoint of the opposite prism edge
- σᵥ (2) — perpendicular to the plane; through one capping H and the midpoint of the opposite prism edge
- σᵥ (3) — perpendicular to the plane; through one capping H and the midpoint of the opposite prism edge
- S₃ — rotate 120°, then reflect in σh
Structure
- Re–H 1.68 Å (prism), 1.72 Å (caps)
- Nine hydrides around one metal
- The textbook nine-coordinate shape
![Nonahydridorhenate(VII) ion ([ReH9]2-) — D3h symmetry elements](/molecular-symmetry/infographics/ReH92-_NonahydridorhenateVIIion_D3h.png)