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During hybridization of d-orbitals why the $d_{z^2}$ and $d_{x^2-y^2}$ orbitals are used up before the $d_{xy}$, $d_{yz}$ and $d_{zx}$ ?

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  • $\begingroup$ Do you mean dx^2- y ^2 ? $\endgroup$ – Rajesh Mar 25 '15 at 17:11
  • $\begingroup$ Yes. Sorry, typing error $\endgroup$ – Dhruba Banerjee Mar 25 '15 at 17:13
  • $\begingroup$ d-orbitals are used up in what? Complex formation? Can you add a source for this statement? $\endgroup$ – Rajesh Mar 25 '15 at 17:15
  • $\begingroup$ In hybridizations. sp3, sp2 etc $\endgroup$ – Dhruba Banerjee Mar 25 '15 at 17:17
  • $\begingroup$ I think VBT doesnt distinguish between the d-orbitals while CFT does. $\endgroup$ – Rajesh Mar 25 '15 at 17:38
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The rotational frame of reference which defined which axis is the z-axis is changed such that $d_{z^2}$ and $d_{x^2-y^2}$ are hybridized first is a convention / practice.

In theory (meaning mathematically), you should be able to get equivalent geometry if you used the other d orbitals for hybridzation.

Basically the donut thing is weird enough we try to fold it in so we can deal with the more normal cloverleafs as leftovers.

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