A. Synthesis of potassium tris-Oxalato chromate(III) hydrated B. Synthesis of tr

ID: 788606 • Letter: A

Question

A. Synthesis of potassium tris-Oxalato chromate(III) hydrated

B. Synthesis of tris(acetylacetonato) Iron(III)

Q1. Draw the structure of each of the above complexes?

Q2. Colors is one of the characteristics of TM complexes. Discussing the electronic structure of

the complexes in A & B above, briefly describe their d-orbital splitting energy diagram and the

possible transitions based on either LFT or CFT.

Q3. Study synthesis B very well and explain the following statement. Acetone is very similar in

structure to acetylacetone, however, in the presence of a base, an alkyl hydrogen is quite

difficult to remove in case of acetone, while the proton is readily lost for acetylacetone in the

same conditions.

Q4. Name the ligands used to synthesizes the above complexes in A & B and assign their

multiplicity?

A) [Cr(C2O4)3]+3

B) [Fe(CH3-(C=o)-cH2-(C=o )-CH3)3]

A) Cr +3 .....[Ar] 3d3 4s0

oxalato is weak field ligand so high spin , colored comp.

3 orbitals of low energy: dxy, dxz and dyz
2 of high energy: dz2 and dx2?y2

B) Fe +3 .......[Ar] 3d5 4s0

oxalato is weak field ligand so high spin , colored comp.

3 orbitals of low energy: dxy, dxz and dyz
2 of high energy: dz2 and dx2?y2

3) due to resonance sstructures in acetylaceton it can easily donate the H and forms the anion

which is not possible in case of acetone

4) oxalato (it is bi dentate ligand)

acetlacetone is also bidentate

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