​why don't we use Afbau principle in this case while filling the orbitals?
​why don't we use Afbau principle in this case while filling the orbitals? • Tetrahedral Complexes • The hybridisation involved is sp3 • Example: [NiC14]2 • The hybridisation scheme is shown in the following diagram. Orbitals ofNi2* ion sp3 hybridised orbitals of Ni2• 14]2. (hight-spin complex) sp3 hybrid Four pairs of electrons from 4Cl-

Dear student
Please find below the solution to the asked query:

Aufbau Principle should always be followed while writing electronic configuration. Transition metals are d block elements and include 3d, 4d and 5d shells of electrons.Unlike s and p block elements,in d block elements, electrons are added to the penultimate shell, expanding it from 8 to 18 electrons. In the atoms of these elements the outermost shell and the penultimate shell are incomplete.
General electronic configuration of transition metals is : (n-1)d1-9ns0 or 1 or 2 
The compound [NiCl4]2- , has sp3 hybridization which is determined as:

At step 1: we find the metal cation and as, x + (-4) = -2  or x = +2, So, metal ion is Ni2+ ion , whose configuration is 3d8 

Step2 : Further, Cl, forms high spin complex , it could not pair up the unpaired electrons of 3d-orbital and so the four electrons pair donated by Cl-atoms are arranged in 4 sp3 hybridized orbitals.

The detailed mechanism is given as below:

Hope this information will clear your doubts regarding the topic.
If you have any other doubts please ask here on the forum and our experts will try to solve them as soon as possible.



  • -2
What are you looking for?