Symmetry Lab › D5h › Iodine heptafluoride
IF₇ Iodine heptafluoride
Pentagonal bipyramidal · point group D5h · order 20
- Point group
- D5h — A C5 principal axis, 5 perpendicular C2 axes and a horizontal mirror plane; these also give 5 vertical planes.
- Order
- 20
- Operations
- E, 2C₅, 2C₅², 5C₂, σh, 2S₅, 2S₅³, 5σᵥ
- Shape
- Pentagonal bipyramidal
- Atoms
- 8 (I, F × 7)
Symmetry elements of IF₇
- C₅ — through the two axial F atoms
- C₂ (1) — along one equatorial bond
- C₂ (2) — along one equatorial bond
- C₂ (3) — along one equatorial bond
- C₂ (4) — along one equatorial bond
- C₂ (5) — along one equatorial bond
- σh — the plane of the five equatorial F atoms
- σᵥ (1) — contains the C₅ axis and one equatorial bond
- σᵥ (2) — contains the C₅ axis and one equatorial bond
- σᵥ (3) — contains the C₅ axis and one equatorial bond
- σᵥ (4) — contains the C₅ axis and one equatorial bond
- σᵥ (5) — contains the C₅ axis and one equatorial bond
- S₅ — rotate 72°, then reflect in σh
Structure
- I–F equatorial 1.857 Å, axial 1.786 Å
- F(eq)–I–F(eq) 72°, F(ax)–I–F(eq) 90°
- No lone pair on I
