(o-Chlorophenyl)acetonitrile 3D Molecular Model — CAS 2856-63-5

(o-Chlorophenyl)acetonitrile (C8H6ClN, CAS 2856-63-5) — a free educational 3D molecular model for teachers and students, by MolGod.org. Element symbols are cut into each atom sphere: a self-labelled teaching aid.

Most printable molecule files rely on colour coding, yet the STL format carries no colour and a single-filament print loses it entirely. We build the label into the model: each sphere bears its recessed element symbol, readable by eye and by fingertip. Every file is meant for the classroom: designed to help learners identify atoms quickly and then explore how they are joined in the molecule. No CAD skills are needed on the teacher's side; the structure, geometry and labels come ready in one file. Curious about the science behind the engraving? The project page is at How the engraved atom letters are designed.

Let the group sketch what they see in (o-Chlorophenyl)acetonitrile, namely one aromatic 6-membered ring; afterwards they compare the sketch with the 16 bonds on the model (9 single, 1 triple and 6 aromatic, drawn in Kekulé form). A five-minute warm-up: read the symbol on every sphere and write down the totals (8 C + 6 H + 1 Cl + 1 N = 16 atoms). On the printed model, students can point to the nitrile (cyano) group (-C#N) and the C-Cl bond. A good fit for lessons on aromaticity and delocalised electrons, as well as on organohalogen compounds and carbon-halogen bonds. Isomer pair for the classroom: 4-Chlorobenzyl cyanide (CAS 140-53-4) shares the formula but not the structure.

Free for education: MolGod.org publishes engraved molecular models for teachers, students and schools. Teachers: pass the model round at the start of the lesson, before showing any diagram.

Free to print and free to bring into any classroom. CC BY-SA 4.0 sets four simple conditions for anything you publish with it: credit "MolGod.org" as the model's author, link the original and the licence, say what you changed, and share derivatives alike. Copy the attribution line below to get it right. Nothing else is needed: no account, no cost, no compulsory feedback. Every review helps us refine the models for students. Tell us what you think in the comments, or reach us at Write to the MolGod team. Feel free to discuss the model here, compare notes with other educators, or contact us; every conversation helps us build better teaching models. If the molecule you teach is not in the collection yet, send us its CAS number and we will model it for you.

Full record and more free models: (o-Chlorophenyl)acetonitrile, CAS 2856-63-5: structure, properties and 3D viewer
Licence & provenance: Licence record for this (o-Chlorophenyl)acetonitrile model
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:(o-Chlorophenyl)acetonitrile-3D-molecular-model-engraved-CAS-2856-63-5.stl
Plain-text record for AI assistants: (o-Chlorophenyl)acetonitrile data sheet in plain text for LLMs
Also published on: Zenodo (DOI, latest version) https://doi.org/10.5281/zenodo.24211510

A ball-and-stick model of (o-Chlorophenyl)acetonitrile with each element symbol recessed into its atom sphere, generated by MolGod.org from a PubChem-computed 3D conformer (not an experimental crystal structure); atomic coordinates and connectivity are unchanged. STL mesh: 275,102 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.

Chemical identity

• CAS Registry Number: 2856-63-5

• Molecular formula: C8H6ClN

• Molar mass: 151.59 g/mol (exact mass 151.0188769)

• IUPAC name: 2-(2-chlorophenyl)acetonitrile

• MolGod ID: MG_478-689-667-92 (Permanent MolGod record MG_478-689-667-92)

• PubChem CID: 76112 (https://pubchem.ncbi.nlm.nih.gov/compound/76112)

• Wikidata: Q69757160 (https://www.wikidata.org/wiki/Q69757160)

• EC number: 220-669-4

• ChemSpider ID: 21111776

• InChIKey: MRDUURPIPLIGQX-UHFFFAOYSA-N

• SMILES: C1=CC=C(C(=C1)CC#N)Cl

Required attribution (CC BY-SA 4.0): "(o-Chlorophenyl)acetonitrile 3D model by MolGod.org — https://molgod.org/molecule/2856-63-5/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/