LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 40

THIRD SEMESTER – April 2009

CH 3809 – COORDINATION CHEMISTRY

 

 

 

Date & Time: 06/05/2009 / 1:00 – 4:00  Dept. No.                                                   Max. : 100 Marks

 

 

PART – A

Answer all the questions                                                            (10 x 2 = 20)

1. Calculate CFSE for high and low spin d⁵ metal complexes.
2. What is spectrochemical series? Mention any two applications.
3. Derive the ground term configuration of d⁶.
4. The magnetic moment of m_obs of [FeF₆]^3- is not equal to the magnetic moment value of m_cal (spin only value), while in  [Fe(CN)₆]^3-, m_obs is equal to m_cal.  Explain.
5. Explain why large numbers of sharp bands of low intensity are observed for d⁵ configuration?
6. Why do electronic spectra of [V(H₂O)₆]3⁺ show only two absorption bands against three predicted for the system?
7. What are the factors that favour charge transfer transition in metal complexes.
8. What are supramolecules?
9. What is Wilkinson catalyst? What type of chemical reaction can be effected by using this catalyst?
10. Mention two biologically important coordination compounds and their applications.

PART – B

Answer any EIGHT questions                                                      (8 x 5 = 40)

1. Discuss any two evidences of crystal field theory.
2. Calculate OSSE and state whether the following oxides are spinel or inverse spinel : Mn₃O₄, Fe₃O₄, CuFe₂O₄.
3. Differentiate labile and inert complexes using crystal field theory.
4. What is linkage isomerism? How are these isomers differentiated by IR spectral analysis?
5. Explain the bonding present in ferrocene using MO theory.
6. State and explain Jahn-Teller effect.
7. What is trans effect? Explain the theories of trans effect in explaining the mechanism of substitution reaction of square planar complexes.
8. Discuss the expected esr spectrum of  [Cu(salicylaldimine)₂]²⁺ ion.
9. Explain the nature and types of interactions of supramolecule.
10. Discuss the structure and functions of the enzyme, carboxypeptidases.
11. Explain the types of photochemical reactions with examples.
12. Write notes on i) the Wackers process ii) hydroformylation reaction

PART C

Answer any FOUR questions                                                (4 x 10 = 40)

 

1. How do the d-orbitals split in square planar and tetrahedral crystal field of ligands?
2. Explain how ORD and CD studies help in determining the absolute configurations of chiral complexes.
3. Explain with the help of MO theory why Cl^– acts as a weak ligand where as CN^–acts as a strong ligand in octahedral transition metal complexes.
4. Explain the features of Tanabe-Sugano and Orgel diagram. Construct orgel diagram for d², d⁷ octahedral and d⁸, d³ tetrahedral of metal ion and explain the possible electronic transitions.
5. Explain the mechanism and factors affecting the innersphere and outersphere electron transfer reaction of metal complexes.
6. Explain the structural aspects of haemoglobin in the oxygen transport.

 

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