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Question
Answer in brief.
With the help of the crystal field, the energy-level diagram explains why the complex [Cr(en)3]3⊕ is coloured.
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Solution
CFT:
ligands are treated as point charges interaction, but ligands & metal are purely electrostatic.
Metal has dorbital = dxy, dxz, dyz, dx2, dy2, dz2
When ligands approach metal, the degeneracy of metal is disturbed.
spit int 2 energy levels = t2g & eg
dxy, dxz, dxz
[Cr(en)3]+3 = en = ethylene diamine bidentate ligand
n = 3
`sqrt(n(n+2)) = sqrt(3(3+2))`
`sqrt15`
= 3.83 B.M
Paramagnetic :
d - d transition = [Cr(en)3]+3 = coloured property
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