Johnsonin
Johnsonin is a fictional chemical compound used in chemistry education to illustrate coordination chemistry, ligand field theory, and molecular nomenclature. It does not correspond to any known substance in standard databases, and no experimental data support its real existence.
In the standard hypothetical description, Johnsonin is a six-coordinate octahedral complex of a transition metal M
Synthesis is described in textbooks as a sequence where a metal salt MX2 reacts with six equivalents
Properties and behavior: color changes with ligand field strength, UV-visible spectra illustrate d-d transitions, and reactivity
Etymology and usage: The name combines “Johnson” with a suffix to indicate the fictional nature, often attributed
Notes: Johnsonin is not real; it is a pedagogical construct used to demonstrate concepts in coordination chemistry.