IT INCLUDE ORGEL DIAGRAM AND TANABE SUGANO DIAGRAM EASY NOTES.IT WOULD BE TO HELPFUL TO STUDENTS.

1. CORRELATION DIAGRAM

2. Orgel diagram
• When metal is placed in L field there is spilitting of energy levels
which can be expressed by orgel diagram.
• Correlation diagram
• Follows spin allowed transition.
• High spin complexes
• dn and dn+5 have same orgel diagram.
Dx(octahedral)=d10-x(tetrahedral)

3. Correlation of spectroscopic terms
into Mulliken symbol

4. Energy
ligand field strength
d1  d6 d4  d9
Orgel diagram for d1, d4, d6, d9
0 D
D
D
d4, d9 tetrahedral
T2g
Eg
d4, d9 octahedral
d1, d6 tetrahedral
E
g
T2g
d1, d6 octahedral
For D
term

5. F
P
Ligand field strength (Dq)
Energy
Orgel diagram for d2, d3, d7, d8 ions
d2, d7 tetrahedral d2, d7 octahedral
d3, d8 octahedral d3, d8 tetrahedral
0
A2g
T1g (F)
T2g
A2g
T2g
T1g (F)
T1g(P)
T1g (P)
For F
term

6. CONCLUSION
• Orgel Diagram Is A Plot Of Energy Of Possible D Orbital Configuration
Vs Ligand Field Strength.
• For D Term-only 1 Transition Is Allowed (Eg To T2g Or T2g To Eg)
• F Term-3 Transition Allowed(t1g T2g,t1g(f) T1g(p),t1g A2g)

7. Tanabe Sugano diagram
• Correlation Diagram
• Plotted B/W Ligand Field Spitting(in Terms Of O/B ) And Energy(in Terms Of
E/B).
• For Both High And Low Spin Complexes.
• Spin Forbidden Also Allowed.
• The Ground State Term Is Taken As Reference And Another Terms Are Plotted
W.R.T. Ground State Term.
Racah parameter-describes various aspects of inter electronic repulsion
Types-A,B,C
B is most imp used in T.S. diagram and describe indivisual d repulsion

10. ADVANTAGES
• Applicable When 10dq > E Repulsion
• To Predict E Transition
• Analysing Uv-visible Spectra.
• To Calculate Dq Values For Ligand Field Spiltting.

11. HEAD OF DEPARTMENT
DR A.K. MISHRA
GUIDED BY
DR SAROJ SHARMA