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inorganic sem 2 > topic 5 > Flashcards

topic 5 Flashcards

1
Q

octahedral disturbance in degeneracy levels

A

t2g

eg

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2
Q

between t2g and eg, what has the lower energy one

A

t2g

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3
Q

what gets filled first t2g or eg

A

t2g
bc of the aufbau principle

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4
Q

random electron config using t2g and eg

A

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

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5
Q

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

A

6 electrons

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6
Q

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

A

4

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7
Q

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

A

10 electrons
bc it’s the d block

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8
Q

what is CFSE

A

crystal field stabilising energy
🔺o

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9
Q

is t2g stabilising or destabilising

A

stabilising

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10
Q

is eg stabilising or destabilising

A

destabilising

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11
Q

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

A

adds (-0.4)
bc it’s -2/5

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12
Q

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

A

adds -0.6 as its + 3/5

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13
Q

what is the 🔺o if:
t2g^1 eg^0

A

-0.4 CFSE

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14
Q

what configurations have 2 possible spin states

A

d4
d5
d6
d7

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15
Q

what are the 2 possible spin states

A

high spin

low spin

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16
Q

what is a high spin config

A

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

P >🔺o

17
Q

what is low spin config

A

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

P < 🔺o

18
Q

what does a higher 🔺o mean

A

a higher CFSE
MEANS ITS A LOW SPIN CONFIG

19
Q

what is 🔺o tensioned against

A

it’s tensioned against Pairing Energy

20
Q

what must we do when calculating CFSE for low spin

A

we need to add the pairing energy

(this depends on the number of unpaired e-)

21
Q

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

A

YES!!

22
Q

what does a more negative cm-1 value mean

A

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

23
Q

what is diff between octahedral and tetrahedral shapes

A

in octahedral there’s high and low spins

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

24
Q

how do TM ions have magnetic properties

A

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

25
Q

what are the diff types of magnetism

A
  • diamagnetism
  • paramagnetism
  • ferromagnetism
26
Q

what is diamagnetism

A

very weak effect associated with paired e-

all compounds some amounts of this

27
Q

what is paramagnetism

A

weak effect due to the presence of unpaired electrons

28
Q

what is ferromagnetism

A

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

29
Q

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

A

u s.o = root N(N+2) uB

N is the number of unpaired e- in the non d generate configuration

30
Q

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

A

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

31
Q

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

A

4.9uB

32
Q

what is the spin only magnetic moment for low spin d4

A

2.83 uB

33
Q

what is a strong field ligand

A

ligands with a large 🔺o

34
Q

what is a weak field ligand

A

ligands with small o🔺

35
Q

what spin configuration do strong field ligands promote

A

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

36
Q

what spin configuration do weak field ligands promote

A

they promote high spin configurations

37
Q

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

A

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

p<🔺o
means low spin

38
Q

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

A

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!!!!

inorganic sem 2 (16 decks)

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