Group Theory Solutions: #3
3.* (1997 1 6) Aluminum (III) hexafluoride anion, AlF63-, has an octahedral structure in which the Al3+ cation is located at the center and the six F- anions are located at the mid points of the six faces of a cube:
Fill in the following table with information about the structure of AlF63-. To receive partial credit describe the symmetry elements you have found.
Is this molecule polar? Chiral?
No, no. Anything with an inversion center is both nonpolar (because the dipole moments cancel out) and achiral (because the inversion center is equivalent to a second order improper rotation axis (S2).