Co-Ordination Compounds Question 290
Question: $ [NiCl_2{{{P{{(C_2H_5)}_2}(C_6H_5)}}_2}] $ exhibits temperature dependent magnetic behaviour (paramagnetic/ diamagnetic). The coordination geometries of $ N{i^{2+}} $ in the paramagnetic and diamagnetic states are respectively
Options:
A) tetrahedral and tetrahedral
B) square planar and square planar
C) tetrahedral and square planar
D) square planar and tetrahedral
Show Answer
Answer:
Correct Answer: C
Solution:
In both states (paramagnetic and diamagnetic) of the given complex, Ni exists as $ N{i^{2+}} $ whose electronic configuration is $ [Ar]3d^{8}4s^{0} $ .
In the above paramagnetic state, geometry of the complex is $ sp^{3} $ giving tetrahedral geometry.
The diamagnetic state is achieved by pairing of electrons in 3d orbital.
Thus the geometry of the complex will be $ dsp^{2} $ giving square planar geometry.
