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Symmetry Lab4AB · ABC Chemistry

Symmetry Lab › Td › Silicon tetrafluoride

SiF₄ Silicon tetrafluoride

Tetrahedral · point group Td · order 24

Open SiF₄ in 3D →

Point group
Td — The full symmetry of a regular tetrahedron: four C3 axes, three C2 axes (each also an S4 axis) and six dihedral mirror planes. There is no centre of inversion.
Order
24
Operations
E, 8C₃, 3C₂, 6S₄, 6σd
Shape
Tetrahedral
Atoms
5 (Si, F × 4)

Symmetry elements of SiF₄

  • C₃ (1) — along one Si–F bond
  • C₃ (2) — along one Si–F bond
  • C₃ (3) — along one Si–F bond
  • C₃ (4) — along one Si–F bond
  • C₂ (x) — bisects two bond angles; also an S₄ axis
  • C₂ (y) — bisects two bond angles; also an S₄ axis
  • C₂ (z) — bisects two bond angles; also an S₄ axis
  • S₄ (x) — rotate 90°, then reflect
  • S₄ (y) — rotate 90°, then reflect
  • S₄ (z) — rotate 90°, then reflect
  • σd (1) — contains Si and two ligands
  • σd (2) — contains Si and two ligands
  • σd (3) — contains Si and two ligands
  • σd (4) — contains Si and two ligands
  • σd (5) — contains Si and two ligands
  • σd (6) — contains Si and two ligands

Structure

  • Si–F 1.553 Å
  • F–Si–F 109.5°
  • No lone pair on Si
Silicon tetrafluoride (SiF4) — Td symmetry elements
Silicon tetrafluoride: symmetry elements of the Td point group

Other Td molecules

P₄White phosphorusNH₄⁺Ammonium ionCCl₄Carbon tetrachlorideCrO₄²⁻Chromate ionCH₄MethaneOsO₄Osmium tetroxideClO₄⁻Perchlorate ionMnO₄⁻Permanganate ionPO₄³⁻Phosphate ionSiH₄SilaneSO₄²⁻Sulfate ionAlCl₄⁻Tetrachloroaluminate ion

Open in the 3D lab →  ·  All Td molecules  ·  All point groups