(a) What type of isomerism is shown by the complex [Co(NH3)5(SCN)]2+? (b) Why is [NiCl4]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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(a) Linkage isomerism is shown by the complex.
(b) Cl− is a weak field ligand so it cannot pair up the electron while CN− is a strong field ligand that can pair up the electrons.
(c) The strong field ligands cause pairing of electrons and in most cases make the last d-orbital empty and thus tetrahedral complex is not formed.