(a) A Kotani plot for the t2f,] configuration consists of a curve similar to that in Fig. 20.29, but levelling off at ^e|-f ~ L8^ib when kT/1.0. Suggest two metal ions that you might expect to possess room temperature values of /./,cff (i) on the near horizontal part of the curve and (ii) on the steepest part of the curve with /te(T<0.5. For the four metal ions you have chosen, how do you expect to be affected by an increase in temperature?
(b) Classify the following ligands as being tr-donor only, 7r-donor and 7r-acceptor: F", CO and NH3. For each ligand, state what orbitals are involved in a- or 7r-bond formation with the metal ion in an octahedral complex. Give diagrams to
(c) The absoiption spectrum represented by the green line in Fig. 20.40 arises from another metal(ll) phthalocyanine complex, [M(Pc)]. (a) Suggest how the ligand H2Pc binds
(d) illustrate the overlap between appropriate metal orbitals and ligand group orbitals.
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