Coordination chemistry Crystal Field Theory.pdf

Crystal Field Theory

1. f,;)J,at is a crystal lield theory?
negative ,'1ar ge
NH3 •
U9a»d
ositive char e
,o
r , 1-~, , L1
s d-orhitals
split up
~hg these orbitals split up?
UT exploiMs this pehnomenon.
rn
I' .1 I jl
Electrostotlc Interaction betk>een ligand owl metal atom.

2. dxy
: !/
dgz
z
Lobes are bek>teen axis
~ 'tetrahedral Complex
~ntrol metal atom
surrounded bg t, llgowls
[ cocl,,] .z
ligands approodt bett.>een axis.
dxz
z
dz
2
!I z
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lobes are along axis
~ 6ctahedrol Complex
~ntrol metoJ atom
surround«J bg 6 ligands
[ Co( NHJ),]CIJ
ligands approocJ, olong axis.

3. NHJ
Strong
Ligand
CFT for Octahedral Complex
dx
2
-yz r dz
2 t
I I I I I I
~ av9ener9y
__.... ,.....I lr--,!r--,1,.......,1,.........1 s pllt up
s d-orbitols
dx
2
-yz dz
2
[I]eg
r +o.,i::.
!-0.t, I::.
I I I I tZg
dxy dyz dxz
CFS
energy
Strong

4. Octahedral Complex
t,th electron In eg Hi9h spin
t,th electron In t2g Lotv sp;n
Stron9
Ugaw:l
+l / 1111,i,i,1,1
Fe _/ av9er1er9g
---.• I I I I I I split up
S d-orbitals Electronic conf i9uration = t2;
1>;oma9netic nature
loiv Spin Complex
dx
2
-
y2 d2
2
[Deg
f +0.66
i-0.t,6
I II I II I II I t
29
dxy dyz dxz
[ill]
+l / 1111,,1 ,p I I I -<
Fe _/ avg ener9y 1111 I 11'1
CFS
energy
Strong
Field
i..>eak
Field
H
20
iJeak
Ligand
---.• I I I I I I split up
s d-orbitals Electronic configuration== t2§ eg
2
High Spin Complex
Paramagnetic nature

5. NHJ
Strong
Ugand
CFT for Tetrahedral Complex
dxg r dgzt dxzf
11I111-----<..
/ avg energy
-----.•I,- ._I "T""l-rl"""Tl-,1_____/' splltup
s d-orbitals
dxy dy2 dxz
I Ii I I tag
'f +o.t,~
! -0.6~
IT]eg
dx
2
-yz d2
2

6. Tetrahedral ,omplex
dxg f dg2 f dxzf
3rd electron in t29 High spin
3rd electron in eg Lo~ spin
1111111, 1, 1, 1
Co avg energy +2 _/
-,, ...... , 1,......,1,......,1,........1 split up
dxy dgz dxz
1 '" , 1 , I t29
f +O.t,b.
! -0.6 b.
llilli] eg NH3 ---+
Strong
Ligand
s d-orbitals
'
. f· .
eg4 t
29
3 dx
2
-y 1. dz
2
£ ectromc con 19urot1on:::
Paramagnetic nature
loJ.J Spin Com pie><
1,1,1,1
+Z IIIJ/IJl!IJI! -<
Co _/ ovg energy lliill]
CFS
energy
Strong
Field
IJeolc
Field
I I I I I I split up
s d-orbitoJs Electronic configuration= e9
4
t2{ High .Spin Complex
Paramagnetic nature

7. I .
C ~+J_ hJ.J. J~ d)~ c,}+8v ~~tr~ C J:
---
q,. l,> . lrJRiJi, o£ -{h ~~ C61"{'~ ~ ;
r~? ·o ~
cy -He XU.., ~ J, 'YO 'rrl.WH) CI I i) um, [ c.-( NH .3),J ~u Cf .
~-
c_)
J ~ o.:m wS ~ e:z./ n.e. { 11) uY\. [z.,., (NH 3) 4 J
2
t-
J et'-Yo. ~ o.c noni ck..&.Je {11) ~ Ct, 'N L.)l.i :· -2. J
j~-Qi~~e-s~.(J) lM1 b§tj H6 c-,1J+ _
,,-
r
C-ccre.r-t a.n2>_t.Jelr. - _
4 HaP1 o:mine ~mwrfl (i~_1m_{c-.-0H.Ji:J [CuC!J
_ ___jB!l,..C::e:Ga~u .&L_cl~_WD_u£ta.wj 3 cv1 p~
~ ·-2:?-bJhJ'c1 llliQ ~ ~
FALSE ?
a

8. ----

9. h)~t ~--<e.. -H''-L lim-bdicrns { c~-tol -pet&
-Me~~ ?
_ An&wQ.Y ' -
-.. ~s -t-R~~ !s Ofplicoc.11~ -l-o ~ L<mS
w,lfu cl_::_ ?J~Jfili ~ _&o~ -not e~~
s -~ p -oxbit-cJs.
-It doeJ. nor exploin _Z _h_01Jlt\Sl_l0 k
n:R· ~ n_ J
_ (a O IJi.01 LJJYl C,.trtn p O"W'\~ . _ _ _ _ __
-
-Ihis th.~cf _urnsr'Je"<s de&"'rt>Stdf c.. ~~~
-b_rl-weeh ~--r:J,. )~ L<fY\. o.n_cl ..t~MJs r
_ h_ehuL ~ry1s1J'?~~-~ t(YUC. b01J~. be:t°w&J
. ~ _bo±-&og.2, nor 0.-'(0W1T foy c.o-va.ient
~+~--ce. .1 ttw.~ ~em o~ coo--rJi"Y\ll.T~ bmcls.
y
-
.W~o CHiO). is °' .sb1in.3e1t. u.1~ ~ .OH, ~--
~ich 4tis -tt;~~ Co-hnoi: e~r\CUtl --- -t
s&fs fnct"o-ri ~ . _ __ _ _
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