Question
Why do compounds having similar geometry have different magnetic moment?
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Answer
The compounds having similar geometry may have different number of unpaired electrons due to the presence of weak and strong field ligands in complexes.
If $\text{CFSE}$ is high, the complex will show low value of magnetic moment and if $\text{CFSE}$ is low,
the complex will show high value of magnetic moment.
For example, the $\ce{[CoF_6]^3}$ is paramagnetic moment.
For example, the $[COF_6]^3$ is paramagnetic but $\ce{[Co(NH_3)_6]^{3+}}$ is diamagnetic.
If $\text{CFSE}$ is high, the complex will show low value of magnetic moment and if $\text{CFSE}$ is low,
the complex will show high value of magnetic moment.
For example, the $\ce{[CoF_6]^3}$ is paramagnetic moment.
For example, the $[COF_6]^3$ is paramagnetic but $\ce{[Co(NH_3)_6]^{3+}}$ is diamagnetic.
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