Can someone explain how aqueous Copper(II) exhibits SP and moved to TBP?

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Ke Lin

What are SP and TBP?

Prof.(Dr.) R.C. Chhipa

These are

Square Planar

Trigonal Bipyramidal

Alexander Kämpfe

As a d9 system Cu(II) exhibits Jahn-Teller-distortion in various coordination modes. Actually, the observed SP is a distorted octahedron with two axial ligand indefinitely wide departed.

Depending on the ligand field stabilazation energy (LFSE) a distinct coordination geometry is prefered in a complex. If LFSEs of two different coordination geometries are similar switching between these geometries may occur.

Energy schemes according to ligand field theory may also be helpful for understanding.