Ligand Field Theory Flashcards
Which orbitals are anti-bonding in a Td symmetric crystal field?

e
Which represents an orbital set that would have e symmetry in a Td crystal field?

D
Tetrahedral transition metal complexes are always_____spin.
High or Low spin
High Spin
In an Oh crystal field, the eg orbitals are destabilized.
What is the value of A?

6
6 coordinate complexes are generally stable as _____ electron species.
18
Square planar complexes are generally stable as _____ electron species.
16
In an Oh crystal field, the t2g orbitals are stabilized.
What is the value of B?

-4
What are the irredicuable representions of the ligand’s SALCs of atomic orbitals around a Oh metal complex
a1g + t1u + eg
Mixing ligand π charater (π-donor) into the t2g set of orbitals in an Oh ligand field results in the t2g set becoming more _________.
Bonding or Antibonding
Antibonding
(Ligand π orbitals are lower in energy than the t2g set and therefore any mixing results in t2g inherting antibonding character)
Addison Tau Parameters
C4v
τ=0
α =β =180o

Addison Tau Parameters
D3h
τ=1
α = 120o
β = 180o

Td=AΔo
What is the value of A?
4/9
(There are only 4 ligands in a tetrhedral complex. Therefore, the ligand field is roughly 2/3 of the octahedral field)
What is the splitting energy of the d-orbitals in an octehedral crystal field?
10Dq or Δo

What is Δo in terms of Dq?
10Dq
What is the symmetry of the orbital set below in a Oh ligand field?

eg
What is the symmetry of the orbital set below in a Oh ligand field?

t2g
As the principal quantum number increases, ∆o_______.
Increases or Decreases
Increases
As the oxidation state increases,∆o_______.
Increases or Decreases
Increases
π-Acceptors_____∆oh
Increases or Decrease
Increase
π-Donors_____∆oh
Increase or Decrease
Decrease
CO, H-, PPh3
Strong or Weak field ligands?
{Rank them}
Strong Field Ligands
PPh3<h>-<co></co></h>
Total Spin
Stot= (# unpaired e-)/2
2*(Stot)+1
Spin Multiplicity
Quintet
Stot=2
Triplet
Stot=1
Doublet
Stot=1/2
Singlet
Stot=0
I- ,H2O ,Cl-
Strong or Weak field ligands?
{Rank Each}
Weak Field Ligands
I-<cl>-<h>2O</h></cl>
I- ,H2O ,Cl-
Strong or Weak field ligands?
{Rank Each}
Weak Field Ligands
I-<cl>-<h>2O</h></cl>
Which represents an orbital set that would have t2 symmetry in a Td crystal field?

C
Which represents an orbital set that would have t2g symmetry in a Oh crystal field?

B
Which represents an orbital set that would have eg symmetry in a Oh crystal field?

A
Which orbitals are antibonding in a Td symmetric crystal field?

t2