if u have an F term wich also has a P term,, the spin can be what
3 or 4
what does the big letter in the term symbol show
it shows the symmetry of the electrons!!!
whats Oh the inverse of
Td
bc u go from 3 on top to 2 on top
all transitions start from what state
all transitions start from the lowest energy state.
u cannot transition from the middle up,, only from the bottom up
does 3F have a P term
yes
describe what 3F splits into at the bottom. for d2
it can split into A2g or T1g.
which one will it be,, okay so this is Oh,, meaning 2 on top and 3 at the bottom,, and bc there are 2 e- and one hold,, the hole can be on any of the dxy, dzy or dzx orbitals and therefore it has 3 different possibilities or arrangement,, this means that it will be the T term,, so its T1g. aka triply degenerate
triply degenerate letter
T
doubly degenerate letter is
E
single degenerate letter is
A
for an F term. with a P term,, the middle split is always what
its always T2g
for d2,, what else can the F term split into for the highest energy, and what levels have we figured out so far
we have
T1g for the bottom bc the 2e- allow the hole to be triply degenerate
then u have T2g bc thats always the middle term for the F term.
then we have A2g
bc its singly deghenerate bc the electrons can only go in the dx2y2 and dz2 orbital and theres no holes in those 2 orbitals bc they both have electrons in them
4 energy levels give how many trabnsitions and from whihc ones do they originate from
4 energy levels = 3 trnasitions and they all originate from the bottom one up!!
how to know what electron config to put on what side of the tanabo sugano diagram
look at the term,, if its E or T or A,, norms A or T. then look at how many electrons u have and if its Oh or Td,, then with this u can see if they will be triply or singly degenerate. thats how yk what side to put them on.
also clock it bc n+ 5 = the same side ,, 10-n = opposite side
n Td and n Oh will also be on opposite sides
10 - n =
opposite sides of the tunabo diagram
n + 5
same side of the tanobo diagram
energy of the split level diagram depend on what
crystal field splitting parameter aka delta
separation between 3F and 3P and how this varies with delta
the magnitude of the interaction between 3T1g F and 3T1g P
for each energy level what do we get
we get energy expressions but we dont need to remember them,, just apply them and we can practice this easily.
what do racah parameters do
describe e- e- repulsion
mostly about d electrons
whats normally the energy gap between 2 states
its normally B or a multiple of B
the energy difference between states of different multiplicities (top left number) is normally
a sum of multiples of C and B
what do we need to treat B as
a variable parameter
fixed input but can be changed to change the output of the system
in short terms what is the nephelauxetic effect
this is when the racah parameter,, B,, is lowered when a metal free ion forms a complex.
this is bc B is a measure of e- e- repulsion in d orbitals,, and when a metal ion forms a complex,, it introduces a degree of covalency which expands the molecular orbital
greater delocalisation ,, increased average separation between d electrons which lowers repulsion
a greater decrease in B means what
theres a greater degree of covalency in that complex.
aka when it goes from a free metal ion to a complex,, mo increases,, less d e- e- repulsion,, lower B value.
long B =
B in complex / B in free ion
