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Why are low spin tetrahedral complexes n...

Why are low spin tetrahedral complexes not formed ?

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In the tetrahedral complexes, the crystal field stablising energy `(Delta_(t))` is less than pairing energy (P). Therefore, electron pairing in the d-orbitals is not possible. Therefore, the number of unpaired electrons will be large and the complex is expected to be paramagnetic with high spin.
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(a) What type of isomerism is shown by the complex [Co(NH_(3))_(5)(SCN)]^(2+) ? (b) why is [NiCl_(4)]^(2-) paramagnetic while [Ni(CN)_(4)]^(2-) is diamagnetic ? (Atomic number of Ni=28) (c) Why are low spin tetrahedral complexes rarely observed?

The tetrahedral complexes are

Nearly all tetrahedral complexes are

Tetrahedral complexes are generally favoured :

Assertion (A) : Low spin tetrahedral complexes are rarely observed. Reason (R) : Crystal field splitting is less than pairing energy for tetrahedral complexes.