The d electron count or number of d electrons is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition metal center in a coordination complex.[1][2] 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, which is a more advanced version based on molecular orbital theory.[3] However the d electron count of an atom in a complex is often different from the d electron count of a free atom or a free ion of the same element.
^Green, Malcolm L. H. (1995-09-20). "A new approach to the formal classification of covalent compounds of the elements". Journal of Organometallic Chemistry. 500 (1–2): 127–148. doi:10.1016/0022-328X(95)00508-N. ISSN 0022-328X.
^MLX Plots (Ged Parkin group website, Columbia University)
^Miessler, Gary L.; Tarr, Donald A. (1998). Inorganic Chemistry (2nd ed.). Upper Saddle River, NJ: Pearson Education. ISBN 0-13-841891-8.
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reinforce fundamental topics in organometallic chemistry like d-electroncount, the 18-electron rule, oxidation state, valency, and the isolobal analogy....
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