Answer:
As
metal ion is fixed, the increasing field strengths (CFSE values) of the ligands
from the spectrochemical series are in the order :
H2O
< NH3< NO2?
Thus,
the energies absorbed for excitation will be in the order :
[Ni(H2O)6
]2+< [Ni(NH3)6]2+<
[Ni(NO2)6 ]4?
As E = the
wavelength absorbed will be in the opposite order.
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