InCH33

InCH33 is a term used primarily in educational and speculative contexts to denote a hypothetical organometallic indium-containing molecule. It does not correspond to a molecule that has been synthesized or characterized in peer-reviewed literature, and it is not considered a real chemical in formal databases.

In academic discussions, InCH33 serves as a placeholder to illustrate concepts in inorganic chemistry and chemical informatics. It is often employed to demonstrate how molecular structure, bonding, oxidation states, and ligand environments can be represented and analyzed without tying the example to a specific real compound. InCH33 may be paired with schematic diagrams that show an indium center coordinated to generic carbon-based ligands and a stabilizing or undefined ligand, with the exact composition varying by author.

Because InCH33 is fictional, no experimental data exists for its properties. When used in teaching, instructors may assign arbitrary values for molecular weight, reactivity, or spectroscopic features to guide students through procedures such as generating SMILES or InChI strings, predicting possible reaction pathways, or practicing computational chemistry workflows. The primary purpose is to illuminate representation and reasoning in inorganic chemistry rather than to model a real substance.

History and usage of the term are informal and largely confined to teaching materials, problem sets, and community wikis. It is commonly encountered in discussions about notation, structure drawing, and the pedagogy of chemical informatics.

See also: InChI, SMILES, organoindium chemistry, chemical informatics, fictional molecules.