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?


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

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