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In the valence bond theory section of my textbook, for the $\ce{[Cu(NH_3)_4]^{2+}}$ complex it is written:

"... physical measurements have indicated that the complex has square planar geometry. One electron from 3d-subshell shifts to 4p-orbital and hence forming four dsp2 hybrid orbitals."

Further, it is stated that this shouldn't happen, and that Huggin suggested that it be a case of sp2d hybridization.

However, in the CFT section of the same book, the hybridization given is dsp2. Which is correct? And why?

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marked as duplicate by Mithoron, Todd Minehardt, Tyberius, Martin - マーチン Aug 20 at 14:07

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