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Chemistry for angular overlap model
Typology: Assignments
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“Inorganic Chemistry” Third Ed. Gary L. Miessler, Donald A. Tarr, 2004, Pearson Prentice Hahttp://en.wikipedia.org/wiki/Expedia
Experimental Evidence for Electronic Structures
Coordination Numbers and Molecular
Shapes
Electronic Spectra Thermodynamic DataMagnetic Susceptibility
Experimental Evidence for Electronic Structures; Thermodynamic Data
What is the stability constants?
The equilibrium constants for formation ofcoordination complex.
Experimental Evidence for Electronic Structures; Thermodynamic Data
Stability constants
Thermodynamic values
→
Prediction of properties, structures
HSAB concepts
Experimental Evidence for Electronic Structures; Thermodynamic Data
HSAB concepts
Experimental Evidence for Electronic Structures; Thermodynamic Data
Entropy Effect
Chelating Ligands
en vs methyl amineFigure in head….Stability….
Chelate EffectFive or six membered ring
Experimental Evidence for Electronic Structures; Magnetic Susceptibility
Gouy methodA sample that is to be tested is suspendedfrom a balance between the poles of amagnet. The balance measures theapparent change in the mass of thesample as it is repelled or attracted by themagnetic field.
Magnetic Susceptibility
Experimental Evidence for Electronic Structures; Magnetic Susceptibility
Electron spin
→
Spin magnetic moment (
m
) s
Total spin magnetic moment
→
Spin quantum #
S (sum of m
Isolated oxygen atom 1s
2 2s
2 p
4
S
= +1/2 +1/2 +1/2 -1/2 = 1 Electron spin
Orbital magnetic moment (
m
) l
Total orbital magnetic moment
→
Orbital quantum #
L (sum of m
)l
Max. L for the p
4
In physics and applied disciplines such as electricalengineering,
the magnetic susceptibility is the degree of
magnetization of a material in response to an appliedmagnetic field.
Experimental Evidence for Electronic Structures; Electronic Spectra
Give a direct evidence of orbital energy levelGive an information for geometry of complexes
Theories of Electronic Structure
Valence bond theoryCrystal field theoryLigand field theoryAngular overlap method
Theories of Electronic Structure; Valence bond theory Fe(III)Isolated ion; 5 unpaired e
In O
h^
compound; 1 or 5 unpaired e
Co(II)
Low spin High spin
Low spin High spin
Theories of Electronic Structure; Crystal field theory
Crystal field theory (CFT) is a model that describes the electronic structure of transition metal compounds
, all of
which can be considered coordination complexes.CFT successfully accounts for some
magnetic properties,
colours, hydration enthalpies, and spinel structures oftransition metal complexes
,^ but it does not attempt to
describe bonding
.
CFT was developed by physicists Hans Bethe and JohnHasbrouck van Vleck in the 1930s.CFT was subsequently combined with molecular orbitaltheory to form the more realistic and complex
ligand field
theory (LFT),
which delivers insight into the process of
chemical bonding in transition metal complexes.
Theories of Electronic Structure; Crystal field theory
Theories of Electronic Structure; Crystal field theory
