coordination complexes
DESCRIPTION
Cl. N. N. N. N. N. N. Co. N. N. N. N. N. N. N. N. Cl. N. N. Cl. Cl. Co. Co. Coordination complexes. [CoCl 2 (en) 2 ]Cl. dichloro. bis(en). cobalt(III). chloride. Cl. trans-. same. Co. Cl. Cl. Cl. cis-. enantiomers. Pt. Coordination complexes. - PowerPoint PPT PresentationTRANSCRIPT
Coordination complexes
[CoCl2(en)2]Cl dichlorobis(en)cobalt(III) chloride
Co
Cl
Cl
N
N
N
Ntrans-
Co
ClN
N
Cl
N
N
cis-
Co
Cl
Cl
N
N
N
N
Co
Cl N
N
Cl
N
N
same
enantiomers
Coordination complexes
Na[FeCl4]
sodium tetrachloroferrate(III)
coordination number 4
tetrahedral square planar
Fe
Cl
Cl
Cl
Cl
(rare)
no geometric isomers
optical isomers
[Pt(NH3)2Cl2]
diamminedichloroplatinum(II)
Pt
Cl
Cl NH3
NH3
PtCl
Cl NH3
H3N
cis
trans
no optical isomers
Bonding
localized electron model octahedral d 2sp3
square planar dsp2
tetrahedral sp3
linear sp
predicts shapes
does not predict colorsmagnetic properties
Crystal Field Model
Crystal Field Model
dz2 dx
2-y
2 dxy dyz dxz
electrostatic repulsion ligand lone pair e-
d-orbital electronscrystal field splitting
colors
colors
400 nm
430 nm
490 nm
560 nm
580 nm
620 nm
800 nm
E = hc
= h
dz2 dx
2-y
2
dxy dyz dxz
[Ti(H2O)6]3+
t2g
eg
h
510 nm
red
spectrochemical series
CN- > NO2- > en > NH3> H2O > F-> OH- > Cl- > Br- > I-
strong fieldlarge
weak fieldsmall as charge increases, increases
t2g
eg
t2g
eg
spectrochemical series
CN- > NO2- > en > NH3> H2O > F-> OH- > Cl- > Br- > I-
strong fieldlarge
weak fieldsmall
[Zn(en)3]2+
colorless
Sc3+d10 d0 high spin d5
weakly colored
colors
low spin high spin
colorscoordination number = 4
dz2 dx
2-y
2 dxy dyz dxz
tet =
tetrahedral
49oct
always high spin
square planar
dxzdyz
dz2
dxy
dx2
-y2
colorscoordination number = 2 linear
dz2
dyz dxz
ligands along z-axis
dx2
-y2dxy
magnetic properties
compounds with unpaired e- paramagnetic
Guoy balance
spectrochemical series
CN- > NO2- > en > NH3> H2O > F-> OH- > Cl- > Br- > I-
strong fieldlarge
weak fieldsmall
[Fe(CN)6]4- [Fe(H2O)6]2+
eg
t2g
eg
t2g
diamagnetic paramagnetic
magnetic properties
compounds with unpaired e- paramagnetic
Guoy balance
spectrochemical series
CN- > NO2- > en > NH3> H2O > F-> OH- > Cl- > Br- > I-
strong fieldlarge
weak fieldsmall
for ≤ 5 unpaired e-
(BM) = n(n+2)
[Fe(H2O)6]2+
eg
t2g
µ = √ 24
µ = 4.90
Coordination Complexes
mineral
animal
vegetable
yes
yes
yes
20 Questions
Fe2+
+ O2
strong field
- O2
weak field
red blue