1a. Like H20, SO2 possesses Civ symmetry. Use the character table below to deter

Question

1a. Like H20, SO2 possesses Civ symmetry. Use the character table below to determine the symmetry labels for the sulfurs, pu py, and p,orbitals, and the ..ligand" and -LG0s (shown below). Show your work by indicating how the orbitals transform (+1,-1, 0) upon carrying out each operation of the Cz, point group. Note: The sulfur and ox perpendicular to this plane. all lie in the yz plane. The _LGOs are 2mm #1 Bi #2 LGOs #2 E LGOS Label Sulfur s Sulfur Sulfur Sulfur p2 LGO #1 LGO #2 LGO #2 b. On the basis of their symmetry, which of the sulfur orbitals would overlap with the -LGOs? Name c. On the basis of their symmetry, which of the sulfur orbitals would overlap with the -LGOs?

Explanation / Answer

Orbital

E

C2

v

v’

Symmetry label

Sulphur S

1

1

1

1

A1

Sulphur Px

1

-1

1

-1

B1

Sulphur Py

1

-1

-1

1

B2

Sulphur Pz

1

1

1

1

A1

LGO 1

1

1

1

1

A1

LGO 2

1

-1

-1

1

B2

LGO1

1

1

-1

-1

A2

LGO2

1

-1

1

-1

B1

b) According to the symmetry matching, Pz and S orbital of sulphur having A1 symmetry will overlap with the ligand sigma orbital

C) The B1 symmetry will overlap with the Px orbital of sulphur while A2 has no overlap.

Orbital

E

C2

v

v’

Symmetry label

Sulphur S

1

1

1

1

A1

Sulphur Px

1

-1

1

-1

B1

Sulphur Py

1

-1

-1

1

B2

Sulphur Pz

1

1

1

1

A1

LGO 1

1

1

1

1

A1

LGO 2

1

-1

-1

1

B2

LGO1

1

1

-1

-1

A2

LGO2

1

-1

1

-1

B1

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