Octahedral splitting

Figure 3-5. The variation of the octahedral splitting with respect to smoothly changing the magnitude of oct-...

For example, in AOM terms, the octahedral splitting A t is given by (5) and illustrated in Fig. 5 for the particular case of a 7T-donor ligand for which en is positive. 

The 4/electrons in the antipenultimate shell are very effectively screened from their chemical environment outside the atom by 5s and 5p electrons. Consequently the 4f electrons do not take part in bonding. They are neither removed to produce ions nor do they take any significant part in crystal field stabilization of complexes. The octahedral splitting of... 

This chapter and the next will introduce the use of d orbitals in transition metal complexes. First of all w e shall build up the orbitals of octahedral ML and square-planar ML4 complexes. These molecular levels will be used to develop the orbitals of fragments which is the topic of Chapters 17-20 so considerable time will be spent on this aspect. How the octahedral splitting pattern and geometry is modified by the numbers of electrons and the electronic nature of the ligands is also undertaken. 

The energy-level diagram appropriate for a discussion of the spectrum of V(H20)e + is shown in Fig. 9-20. The P term is placed higher than F, following Hund s second rule. The term is known to be 11,500 cm above the F term in the ion. A calculation is required in order to obtain the relative energies of the three levels produced from the F term. The results are given in Fig. 9-20 in terms of the octahedral splitting parameter A. 

---