Light-Induced Excited State Spin Trapping in Iron ll Compounds

2 Light-Induced Excited State Spin Trapping in Iron(ll) Compounds 

Tanabe-Sugano diagram for (Of,), where the diagram has been annotated to indicate the observed electronic transitions for both the HS and LS forms of [Fe(ptz)g](BF4)2, which occur at 292 and 20 K, respectively. [Adapted from Figgis, B. N. Hitchman, M. A. Ligand Field Theory and Its Applications, Wiley-VCH New York, 2000. This material is reproduced with permission of John Wiley Sons, Inc.] 

TABLE 17.19 Absorption bands for crystalline [Fe(ptz)g](BF4)2 and their assigned eiectronic transitions at two different temperatures. 

Jablonski diagram illustrating the role of the T,g in the LIESST and reverse-LIESST effect of spin crossover Fe(ll) coordination compounds. 

Example 17-8. Given that the value of A goes as /t and that the measured Fe-N bond lengths at 293 and 20 K are 2.18 and 1.98 A, respectively, show that the calculated ratio of Ag(LS)/Ao(HS) from Example 17-7 agrees with the ratio predicted on the basis of the difference in metal-ligand bond lengths. 

---