(i) Explain geometrical isomerism with reference to square planar complexes giving one example. How is tetrahedral complexes with simple ligands do not exhibit geometrical isomerism?
(ii) Using valence bond theory, predict the shape and magnetism (paramagnetism) or diamagnetism of [Co(CO)4]– (at. no. of Co = 27)?
(iii) How is stability of coordination compounds determined in aqueous solution?
(i)
Tetrahedral complexes do not show geometrical isomerism because relative position of ligands are the same.
(ii) Co (27) = 4s23d 7
Co3+ = 4s°3d 6
It has sp3 hybridisation, it is paramagnetic.
(iii) Stability of coordination compound in aqueous solution is determined with the help of stability constant. Higher the value of stability constant, greater will be stability. Smaller the cation, higher the charge on the cation, more stable will be the complex.
