Question

Which of the following complex ions should absorb the shortest wavelengths of electromagnetic radiation? Cu(F)42- Cu(Cl)42-...

Which of the following complex ions should absorb the shortest wavelengths of electromagnetic radiation?

Cu(F)42-

Cu(Cl)42-

Cu(I)42-

Cu(Br)42-

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Answer #1

The stronger the ligand ==> greater is the energy gap between the splitted d-orbitals of the metall ion ==> greater will be the energy absorbed by the metal ion

Hence the complex with ligand most to right in spectrochemical series absorbes the highest energy from radiation

The spectrochemical series is
I- < Br- < Cl- < F- < OH- < H2O < NH3 < en < NO2 - < CN-

Shorter wavelength means higher enegry [inverse relationship]

As suggeste dby spectrochemicla series, F- ligand is the strongets in the given complex ligands, hence absorbs hihest energy and therefore exhibits shortest wavelength [option 1 complex]

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