most time， metal centre has d8 electron configuration， the complex is square planar.
metal centre has d0， d10 (sometime d9) electron configuration， the complex is tetrahedral.
in tetrahedral ligand field， electrons of the metal ion like to take high spin configuration due to T2 is not too high comparing with E.
in square planar complex， it is always low spin.
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ira_qy136 
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