5a

Question 1

the effective magnetic moment is directly related to what

Answer 1

the spin and orbital quantum number
S+L = root 4s(s+1) + L(L+1)

Question 2

to get the L(L+1) thing what needs to occur

Answer 2

electrons need to move between orbitals

Question 3

when do we expect first order orbital contribution

Answer 3

when the orbitals the e- are travelling between are degenerate and have the shape shape.

Question 4

an example of orbitals of tha swme energy and shape can be the

Answer 4

the t2g orbitals

aka e- can move begeeen them and generate magnetic moment

Question 5

can d1 give first order orbital contribution in Oh

Answer 5

yess
the electron can move between the degenerate and same shape t2g orbitals
t2g

Question 6

can d2 give first order orbital contribution

Answer 6

yes
(t1g)

Question 7

can d3 Oh give a first order orbital contribution

Answer 7

nope bc they can’t move anywhere (A2g)

Question 8

can d4 high spin give rise to first order orbital contribution

Answer 8

nope
bc t2g and eg are different in energy!! they’re not degenerate or the same shape
Eg term

Question 10

are dx2-dy2 and dz2 the same shape

Answer 10

nope!!

Question 11

does d4 low spin give FOOC

Answer 11

yes
e- can move to any of the t2g orbitals
T1g

Question 12

does high spin d5 give FOOC

Answer 12

nope
bc the dx2-y2 and dz2 are diff shapes

Question 13

is low spin d5 giving us Fooc

Answer 13

yes bc the e- can go into any t2g orbital

Question 14

does d1 Td give us FOOC

Answer 14

nope

remember dz2 and dx2y2 are diff shapes
E

Question 16

is d2 Td giving FOOC

Answer 16

nope
diff shapes

Question 17

is d3 Td high spin giving FOOC

Answer 17

yesss
e- can go in any t2 orbital

Question 18

T term issss

Answer 18

temp dependent
has FOOC
their magnetic moment will be temp dependent

Question 19

do ground terms with A or E terms have a FOOC

Answer 19

nope!!
they have a second order orbital contribution but it’s independent of temp.

the gs and es mix

Question 20

what’s up with the magnetic moment formula for T terms

Answer 20

it has the spin and orbital quantum numbers

Question 21

what’s up with the magnetic moment for E and A terms

Answer 21

it has the spin quantum number only

no orbital bc the orbitals aren’t the same for e- to be moving between them

Question 22

what’s the spin only magnetic moment equation

Answer 22

root 4s(s+1) capital

root(n(n+2)

Question 23

in A and E terms what can’t occur

Answer 23

first order orbital coupling can’t occur

Question 24

although FOOC can’t occur for A and E terms what can

Answer 24

there can be mixing with the orbital contribution from high T terms of the same multiplicity as the ground term ( same spin)

Question 25

there can be mixing with high T terms when u have an A or E term but what a and t term have no high T term

Answer 25

high spin d5!! the spin only magnetic moment is exact

Question 26

if the A and E term have a high T term,, and mixing can occur what is the equation

Answer 26

ueff = u spin only (1-a h / delta) a is 2 for E a is 4 for A2

Question 27

what can a be in the mixing high T and A E terms

Answer 27

it’s 4 for A2 and 2 for E

Question 28

what’s the h in the mixing magnetic moment aka (1-ah/delta)

Answer 28

it’s the spin orbit coupling constant and has a positive sign for d1-4 and negative for d6-9

Question 29

why does the spin orbit coupling constant become positive for d1-4 but is negative for d5-9 LSd5

Answer 29

bc from d1-4 it’s half empty from d5-9 it’s half full

Question 31

if Ueff > uso

Answer 31

d5-9 low spin d5

Question 32

if ueff < uso

Answer 32

d1 - d4

Question 33

d7 and mag moment = 4.59bm at 298k how many spin allowed transitions are there ,, sign them and comment on their intensity

Answer 33

d7 so 3 allowed d d transitions spin = 4 (ls) larporte forbidden bc no change inL bc dd GS = A term so temp independent,, so delta doesn’t change with Temp A term so no FOOC ,, uobs = 4.59 uso= root (3(3+2) n= unpaired e- for A term a is 4 then find delta using uobs=uso (1-ah/delta)