The d electron count is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition metal center in a coordination complex. The d electron count is an effective way to understand the geometry and reactivity of transition metal complexes. The formalism has been incorporated into the two major models used to describe coordination complexes; crystal field theory and ligand field theory (a more advanced version based on molecular orbital theory).
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... Often tetrahedral complexes limited to form 4 additional bonds (8 additional electrons) by the 18-electron ceiling ... Often colorless due to the lack of d to d transitions ...
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