Distortions from an Octahedral Geometry

15 TRANSITION METAL COMPLEXES A STARTING POINT AT THE OCTAHEDRON 

Walsh diagram for bending one trans L—M—L angle in a MLe complex. 

An analysis of bending for two cis ligands In 15.40 can be constructed along the same lines. A convenient top view of this distortion Is presented in 15.49. Here, 

These cis and trans L-M-L angle distortions split the degeneracy of the set In 

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Fluorescence from a six-coordinate copper(II) complex is quite rare and it is easy to see why from the energy level diagram of Fig. 7. If the CuF center is distorted from an octahedral geometry then the lowest level of the T2g multiplet comes very close in energy to the upper sheet of the E <8) e Jahn-Teller surface. For positive Qg in Fig. 7 this is the z excited state, and will offer an efficient... 

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