CF\LF Theory - Mixed Questions

Question 1

Which orbitals are non-bonding in a T_d symmetric crystal field?

Answer 1

e

Question 2

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

Answer 2

D

Question 3

Tetrahedral transition metal complexes are always_____spin.

High or Low spin

Answer 3

High Spin

Question 4

In an O_h crystal field, the eg orbitals are destabilized.

What is the value of A?

Answer 4

6

Question 5

In an O_h crystal field, the t_2g orbitals are stabilized.

What is the value of B?

Answer 5

-4

Question 6

Mixing ligand π charater (π-donor) into the t_2g set of orbitals in an O_h ligand field results in the t_2g set becoming more _________.

Bonding or Antibonding

Answer 6

Antibonding

(Ligand π orbitals are lower in energy than the t_2g set and therefore any mixing results in HOMO frontier orbitals being of antibonding character)

Question 7

T_d=AΔ_o

What is the value of A?

Answer 7

4/9

(There are only 4 ligands in a tetrhedral complex. Therefore, the ligand field is roughly 2/3 of the octahedral field)

Question 8

What is the splitting energy of the d-orbitals in an octehedral crystal field?

Answer 8

10D_q or Δ_o

Question 9

What is Δ_o in terms of D_q?

Answer 9

10D_q

Question 10

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

Answer 10

e_g

Question 11

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

Answer 11

t_2g

Question 12

As the principal quantum number increases, ∆_{o_______.}

Increases or Decreases

Answer 12

Increases
(Larger orbitals result in stronger interaction with ligands)

Question 13

As the oxidation state increases,∆_{o_______.}

Increases or Decreases

Answer 13

Increases

Question 14

π-Acceptors_____∆_oh

Increases or Decrease

Answer 14

Increase

Question 15

π-Donors_____∆_oh

Increase or Decrease

Answer 15

Decrease

Question 16

CO, H^-, PPh₃​

Strong or Weak field ligands?

{Rank them}

Answer 16

Strong Field Ligands

PPh₃<h>-<co></co></h>

Question 17

Total Spin

Answer 17

S_tot= (# unpaired e^-)/2

Question 18

2*(S_tot)+1

Answer 18

Spin Multiplicity

Question 19

Quintet

Answer 19

S_tot=2

Question 20

Triplet

Answer 20

S_tot=1

Question 21

Doublet

Answer 21

S_tot=1/2

Question 22

Singlet​

Answer 22

S_tot=0

Question 23

I^- ,H₂O ,Cl^-

Strong or Weak field ligands?

{Rank Each}

Answer 23

Weak Field Ligands

I^- < Cl^- < h₂O

Question 24

Which represents an orbital set that would have t₂ symmetry in a T_d crystal field?

Answer 24

C

Question 25

**Which represents an orbital set that would have t_2g symmetry in a O_h crystal field?**

Answer 25

**B**

Question 26

**Which represents an orbital set that would have e_g symmetry in a O_h crystal field?**

Answer 26

**A**

Question 27

**Which orbitals are antibonding in a T_d symmetric crystal field?**

Answer 27

**t₂**