7a

Question 1

so far jahn teller has been about what

Answer 1

its been about extending or compressing the axisssss

Question 2

what other distortions from high symmetry can jahn teller do

Answer 2

they can compress or extend the faces,, aka u flip the diamond shape around so u get faces pointing up and down

then u can extend or compress these

Question 3

trigonal vs tetrogonal distortions

Answer 3

trigonal = faces
tetragonal = axis change

Question 4

whats the z2 // z axis doing when u have the trigonal jt distortion

Answer 4

u have like 2 triangles

and the dz2 orbital has both triangles on itself

aka its like balancing the two triansgles on itself.

its going through the faces

Question 5

when u have the two triangles for trigonal jt distortion,, where are all the d orbitals

Answer 5

all the d orbitals are between the two triangles!!!

Question 6

when u have trigonal distortion and all the d orbitals are between the faces,, is there a lot of repulsion between everything

Answer 6

nope!
repulsion is lowks low
as u elongate or compress the faces,, the interaction and repulsion between the ligands and the orbitals change

causing a change in arrangment

Question 7

descibe the orbitals in the faces

Answer 7

u have dz2 which is kinds just going through both of them

then u have dzx and dyz which are kinda in the plane of the faces and interact with ligands the most

then u have dx2-y2 and dxy which are kinda away from all ligands

Question 8

what d orbital is the highest energy one when we have the trigonal distortion for d1

Answer 8

okay so d1 is 1 e-,, so we want this to have its own orbital

so the lowest energy for d1 will be dz2 for TBP,, then u will have the dxy and dx2-y2 then u have the dzy and dxy highest energy

Question 9

what groups are the d electrons split into for TBP and trigonal distortions

Answer 9

dzy dxz
dx2-y2 dxy
dz2

Question 10

for d1,, dz2 needs to have the lowest energy for the 1 e- to be in the 1 degenerate orbital ,, will this be trigonal compression or elongation

Answer 10

this will be compression
bc the dz2 is normally aligned wiht the faces,, compressing it will kinda make the ligands pass it and reduce its interaction with it.

Question 11

where are the ligands on the triangles for the trigonal distortion

Answer 11

on the corners of the traisngles ,, aka the traingle faces

Question 12

what about d2,, what trigonal distortion do we want and what e- do we need in what orbtials

Answer 12

dzy, dxz
dz2
dx2-y2 dxy

two electrons go in that one first

trigonal elongation

Question 13

if we have trigonal distrotion,, what energy levels swap with the faces being compressed or elongated

Answer 13

dzy, dxz is always highest in energy
dz2
and
dx2-y2 and dxy will always swap round.

Question 14

what quenches the orbital contribution

Answer 14

the compressing of triangles aka faces quenches the orbital contribution

Question 15

trigona lcomplexes most common names are

Answer 15

trigonal bipyramidal complexes

Question 16

why is dz2 the highest energy

Answer 16

bc it sits on the z axis and therefore has the most interaction and repulsion with ligands

Question 17

why is dx2-y2 and dxy middle in energy

Answer 17

bc theyre in the plane with 3 ligands,, they dont directly clash but they stilll interact

Question 18

why is dzy dxz the lowest in energy

Answer 18

bc they interect less with the ligands

Question 19

will trigonal complexes ever have temp dependence

Answer 19

nope ,, temp will not affect their magnetic moment
they will be temp independent unless there is a chnage in spin state

Question 20

what is tren

Answer 20

a ligand that makes high spin species

bc the splitting is so weak

Question 21

what is the opposite of tren

Answer 21

QP

Question 22

how is QP opposite tren

Answer 22

bc it gives TBP complexes low spin character ,, aka larger splitting

lows said to give intermediate spin

Question 23

in TBP ,, how many ligand sites do w ehave

Answer 23

we have 5!!

Question 24

for Oh what is the splitting

Answer 24

the splitting is t2g and eg

Question 25

for TBP what is the splitting

Answer 25

dz2 dx2-y2 dxy dzx dzy

Question 26

is the delta between TBP dx2-y2 dxy and dzy dxz big

Answer 26

nope its a small splitting therefore when we add e- to them we add them in both, aka as if we were doing HS

Question 27

is low spin d6 Oh paramagnetic,,, aka does ti have unpaired e-

Answer 27

it doesnt have unpaired e- however it is atill called paramagnetic bc there is some orbital contribution!!

Question 28

what d config is dimagnetic for TBP

Answer 28

the d8,, aka when all orbitals except dz2 are full with e-

Question 29

MCl2 metal reacts with QP to give [M(QP)Cl]+ magetic moment of 3.96BM same thing reacts with CN- to give [M(CN)6]4- magnetic moment of 2.0BM find M

Answer 29

QP = TBP!!! so yk the splitting QP = neutral ligand outer charge - (ligand charge) = 2+ so M2+ u = 3.96BM so n =3 (upe-) if we react with CN we get Oh geom u = 2.0BM so n =1 uobs>uso so d5-d9 CN = SFL so low spin,, and we have 1 upe- in Oh : d1,d5,d7,d9 LS Oh with n=1 now we check for TBP: we need 3upe- ,, d3,d5 both have d5 as an option M2+ = d5 so has to be d7 which is Mn

Question 30

whats a somo

Answer 30

singly occupied MO

Question 31

what are some organometallic compounds

Answer 31

metallocenes and bis-arene compounds

Question 32

what are metallocene compounds

Answer 32

ones where the 5d obritals interact with pi, sigma and delta

Question 33

what are the frontier orbitals

Answer 33

the d obritald that split into e1 of ligand interacts with : pi* combo of dxz and dyz (highest energy) e2 of ligand interacts with : delta from the dx2-y2 and dxy a1 of ligand interacts with: singma from dz2

Question 34

a1 has how many nodes

Answer 34

no nodes,, all d obritals in the pentagon are in phase pi 1 overlaps with dz2

Question 35

pi 2 interacts with what orbitals

Answer 35

this is the one with 1 node dzy or dxz

Question 36

3 pi interacts with what

Answer 36

this is the one with 2 nodes u have dx2-y2 and dxy