5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one 3D Molecular Model — CAS 1003-35-6

5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one (C2H4N4O, CAS 1003-35-6) — a free educational 3D molecular model for teachers and students, by MolGod.org. Symbols are engraved into every atom, so students read atoms by symbol, not by colour.

Look at the skeleton first: 5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one contains one 5-membered ring, and students can trace 11 bonds (9 single and 2 double). How many atoms can the class find? The engraved spheres give 2 C + 4 H + 4 N + 1 O, so the answer should be 11. Name-and-locate exercise: students find the primary amino group (-NH2) and the pyridine-type ring nitrogen on the model and afterwards write the name of every group they found. It makes heteroaromatic rings (nitrogen inside an aromatic ring), as well as amines and basicity easier to see. Link the model to intermolecular forces through its hydrogen-bond capacity: 3 acceptors, 3 donors (computed).

Free for education: MolGod.org publishes engraved molecular models for teachers, students and schools. Teachers: give each table a model and have students write the formula from the engraved atoms.

Full record and more free models: https://molgod.org/molecule/1003-35-6/?utm_source=printables&utm_medium=referral&utm_campaign=edu-3d-models

Licence & provenance: https://molgod.org/licenses/stl/1003-35-6/

Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one-3D-molecular-model-engraved-CAS-1003-35-6.stl

A ball-and-stick model of 5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one 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: 140,640 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.

Chemical identity

• CAS Registry Number: 1003-35-6
• Molecular formula: C2H4N4O
• Molar mass: 100.08 g/mol (exact mass 100.03851076)
• IUPAC name: 3-amino-1,4-dihydro-1,2,4-triazol-5-one
• MolGod ID: MG_667-657-426-26 (https://molgod.org/id/MG_667-657-426-26)
• PubChem CID: 135481969 (https://pubchem.ncbi.nlm.nih.gov/compound/135481969)
• Wikidata: Q82044002 (https://www.wikidata.org/wiki/Q82044002)
• InChIKey: XOHBRLLZSIGHDE-UHFFFAOYSA-N
• SMILES: C1(=NNC(=O)N1)N

Required attribution (CC BY-SA 4.0): "5-Amino-1,2-dihydro-3H-1,2,4-triazol-3-one 3D model by MolGod.org — https://molgod.org/molecule/1003-35-6/ — CC BY-SA 4.0"

Licence text: https://creativecommons.org/licenses/by-sa/4.0/