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octahedral distortion in metal transition complex

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xshadow:
I dont' understand very well when a distortion (for example z axis elogantion/compression) can occour in an octahedral complex


-I've read that can occour when the six ligand are different...for example [M(Cl)4O2]  +/- n ...the oxygen ligands can cause a compression on the z-axis

- In another example I've seen a complex with  the same 6 ligands  [M(NH3)6] that can follow an octahedral distartion....but usually when is a d8


So can a distortion occour in both cases??
THANKS :)

Orcio_87:
Complex with different ligands are obvious, but distortion can occur also with 6 same ligands - V(CO)6 is an example. Here are reason of the distortion for a complex with 6 same ligands: https://en.wikipedia.org/wiki/Jahn%E2%80%93Teller_effect

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