Co3+=[Ne]3s2 3p6 3d6 F is weak field ligand for
Co3+ thus pairing of d-orbitals electrons does not happen, so it forms:
1. outer orbital complex of hybridization
sp3d2 2. high spin complex means that there are more number of unpaired electrons
en = ethylenediamine is a strong field ligand for
Co3+ thus the pairing of d-orbitals happening for formation of complex of
Co3+ with ligand
ethylenediamine so it forms:
1. inner-orbital complex of hyridization
d2sp3 2. low spin complex
3. Stable complex form beacuse of ethylenediamine is a chelating legand.
(i) Unpaired of electrons present in
[CoF6]3− thus it is paramagnetic complex.
(ii)
[Co(en)3]3+ is more stable beacuse of chelation.
(iii)
[Co(en)3]3+ (iv)
[CoF6]3−