Crystal Field Theory

Question 1

How to find D-system?

Answer 1

Use the transition metal compound and subtrcat the charge on the metal to get d.
dn = group # - oxidation state.
Oxidation state is usually the charge on molecule

Question 2

Low Spin

Answer 2

Strong field

Question 3

High Spin

Answer 3

Weak field

Question 4

How to know if its high spin or low spin?

Answer 4

If splitting energy is greater than pairing energy its low spin
If splitting energy is less than pairing energy its high spin.

Question 5

t2gn egm

Answer 5

n = amount of electrons in bottom orbital
m = amount of electrons in top orbital

Question 6

Is tetrahedral high or low spin?

Answer 6

Tetrahedral tends to be high spin

Question 7

Is octahedral high or low spin?

Answer 7

Octahedral is high if in first row transition metals and weak field ligand or low oxidation

Question 8

Octahedral Splitting diagram

Answer 8

Three at (-4) dxy , dxz, dyz
Two at (+6) dz2 , dx2y2

Question 9

Tetrahedral Splitting diagram

Answer 9

Two at (-2.67) dz2 , dx2y2
Three at (+1.78) dxy , dxz, dyz

Question 10

Calculating CFSE

Answer 10

CFSE = (orbital energy 1)(# of electrons in orbital) + (orbital energy 2)(# of electrons in orbital)

Question 11

Empty orbital is…

Answer 11

Pairing energy!

Question 12

Splitting energy increases ____ a column

Answer 12

Down