Lattice Energies and Ionic Radii Connecting Crystal Field Effects with Solid-State Energetics

LATTICE ENERGIES AND IONIC RADII CONNECTING CRYSTAL FIELD EFFECTS WITH SOLID-STATE ENERGETICS  

If you have already covered crystal field theory (Chapter 4), we are now in a position to apply it to a discussion of the lattice energies of solid-state compounds containing transition metals. We start with the ionic radii of the first-row transition metals. 

Shannon-Prewitt ionic radii for (o) and (6) cations having electron configurations of 3 f, n = 0 to 10. Open circles = high-spin cases open squares = low-spin cases dashed lines = trend for spherically symmetric sets of orbitab dotted lines = trend for weak-field, high-spin cases dashed-dotted lines = trend for strong-field, low-spin cases. 

Explanation of the trends in ionic radii of M weak field cationsJhe placement of the first five d electrons in a weak-octahedral-field, high-spin case, (o) The first three electrons occupy the tj, orbit-ab pointing in between the ligands. The ionic radii of ions with these configurations are smaller than expected. 

The lattice energies for the chlorides of the transition metal cations. 

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