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Why are low spin tetrahedral complexes n...

Why are low spin tetrahedral complexes not formed ?

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In splitting of d-orbitals, three fold degenerate set, `t_(2)`, has higher energy than two-fold degenerate set, e in tetrahedral complexes. The splitting is much smaller than that in case of octahedral complexes, i.e.
`Delta_(t) = (4)/(9)Delta_(0)`. This energy is so small that it is unable to force the electrons to pair up. Hence, tetrahedral complexes have high spin configuration and low spin complexes are not formed.
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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?

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