topic 5

Question 1

octahedral disturbance in degeneracy levels

Answer 1

t2g

eg

Question 2

between t2g and eg, what has the lower energy one

Answer 2

t2g

Question 3

what gets filled first t2g or eg

Answer 3

t2g
bc of the aufbau principle

Question 4

random electron config using t2g and eg

Answer 4

put the number of electrons as powers for each of the splits

Question 5

what is the max number of electrons that can occupy the t2g

Answer 5

6 electrons

Question 6

what is the max number of electrons that can occupy the eg

Answer 6

4

Question 7

what is the total max number of electrons for t2g and eg

Answer 7

10 electrons
bc it’s the d block

Question 8

what is CFSE

Answer 8

crystal field stabilising energy
🔺o

Question 9

is t2g stabilising or destabilising

Answer 9

stabilising

Question 10

is eg stabilising or destabilising

Answer 10

destabilising

Question 11

what value does adding an e- to the t2g add to 🔺o

Answer 11

adds (-0.4)
bc it’s -2/5

Question 12

what does adding an e- to eg do to the 🔺o value

Answer 12

adds -0.6 as its + 3/5

Question 13

what is the 🔺o if:
t2g^1 eg^0

Answer 13

-0.4 CFSE

Question 14

what configurations have 2 possible spin states

Answer 14

d4
d5
d6
d7

Question 15

what are the 2 possible spin states

Answer 15

high spin

low spin

Question 16

what is a high spin config

Answer 16

max number of unpaired e-
the e- enters the high energy split (eg)

P >🔺o

Question 17

what is low spin config

Answer 17

min number of unpaired e-
e- are paired up in lower split (t2g)

P < 🔺o

Question 18

what does a higher 🔺o mean

Answer 18

a higher CFSE
MEANS ITS A LOW SPIN CONFIG

Question 19

what is 🔺o tensioned against

Answer 19

it’s tensioned against Pairing Energy

Question 20

what must we do when calculating CFSE for low spin

Answer 20

we need to add the pairing energy

(this depends on the number of unpaired e-)

Question 21

does changing ligands change the 🔺o (cm-1)

Answer 21

YES!!

Question 22

what does a more negative cm-1 value mean

Answer 22

it’s more stabilised
it’s high spin
(majority of e- are unpaired)

Question 23

what is diff between octahedral and tetrahedral shapes

Answer 23

in octahedral there’s high and low spins

in TETRAHEDRAL there’s only HIGH SPIN - follow aufbau principle and don’t pair up

Question 24

how do TM ions have magnetic properties

Answer 24

bc they have unpaired e- resulting in diff types of magnetism

Question 25

what are the diff types of magnetism

Answer 25

- diamagnetism - paramagnetism - ferromagnetism

Question 26

what is diamagnetism

Answer 26

very weak effect associated with paired e- all compounds some amounts of this

Question 27

what is paramagnetism

Answer 27

weak effect due to the presence of unpaired electrons

Question 28

what is ferromagnetism

Answer 28

a strong effect example of a bulk magnetic property that results from long range electron electron interactions

Question 29

what is the equation for the spin magnetic moment ( u s.o)

Answer 29

u s.o = root N(N+2) uB N is the number of unpaired e- in the non d generate configuration

Question 30

what is uB in the spin only magnetic moment ( u s.o)

Answer 30

this is the units for the spin only magnetic moment u s.o

Question 31

what is the spin only magnetic moment for high spin for d4

Answer 31

4.9uB

Question 32

what is the spin only magnetic moment for low spin d4

Answer 32

2.83 uB

Question 33

what is a strong field ligand

Answer 33

ligands with a large 🔺o

Question 34

what is a weak field ligand

Answer 34

ligands with small o🔺

Question 35

what spin configuration do strong field ligands promote

Answer 35

low spin configurations aka think of it as the energy CFSE 🔺o is too large to put e- in the eg orbitals so they must be low spin

Question 36

what spin configuration do weak field ligands promote

Answer 36

they promote high spin configurations

Question 37

how do we remember if smt is high spin or low spin

Answer 37

p > 🔺o plane in the sky is high means high spin p<🔺o means low spin

Question 38

how do we figure out if a complex is high spin or low spin

Answer 38

find the CFSE ( x -2/5. and x 3/5) multiply this by the 🔺o for paired up e- (low spin config) add the pairing constant the more (-) number is the spin it is!!!!