Aziridine

A secondary amine, C2H5N, 43.069 g/mol. Boiling point 55-56 °C at 760 mm Hg, melting point -71.5 °C, as published.

verified recordOrganic — secondary amine8 measured properties

Identifiers

Molecular formula: C₂H₅N
Molecular weight: 43.069 g/mol
Exact mass: 43.042199 g/mol
IUPAC name: aziridine
SMILES: C1CN1
InChI: InChI=1S/C2H5N/c1-2-3-1/h3H,1-2H2
InChIKey: NOWKCMXCCJGMRR-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: 131 to 133 °F at 760 mmHg (EPA, 1998)measured · CAMEO Chemicals; 55-56 °C at 760 mm Hgmeasured · Hazardous Substances Data Bank (HSDB)
Melting Point: -98 °F Freezing Point (EPA, 1998)measured · CAMEO Chemicals; Freezing point: -71.5 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Density: 0.8321 at 68 °F (EPA, 1998) - Less dense than water; will floatmeasured · CAMEO Chemicals; 0.8321 at 24 °C/4 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Solubility: Miscible (NIOSH, 2024)measured · CAMEO Chemicals; SOL IN ALKALImeasured · Hazardous Substances Data Bank (HSDB)
Vapor Pressure: 160 mmHg at 68 °F (EPA, 1998)measured · CAMEO Chemicals; 213.0 [mmHg]measured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
LogP: -0.36measured · ILO-WHO International Chemical Safety Cards (ICSCs)
Flash Point: 12 °F (EPA, 1998)measured · CAMEO Chemicals; The Guide from the Emergency Response Guidebook is for "ethylenimine, inhibited." -11 °Cmeasured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Refractive Index: Index of refraction = 1.412 at 25 C/Dmeasured · IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work).

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 43.07 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 43.042199164 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: -0.4calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 21.9 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 10calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 1calculated · reference compound database
logP: -0.4104calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 21.94 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 1calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 0calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 12.8697 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 1calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.3661calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

C Carbon2 atoms · 55.8% by mass
N Nitrogen1 atom · 32.5% by mass
H Hydrogen5 atoms · 11.7% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 3
Total atoms, hydrogen included: 8
Rings: 1
Aromatic rings: 0
Stereocentres: 0
Formal charge: 0

Functional groups

Secondary amine
Nitrogen bonded to two carbons.

Matched by structural pattern, not by a measurement.

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Aziridine yet.

Other names for it

The systematic name on this record is aziridine.

The sources also call it ETHYLENEIMINE, Ethylenimine, Azacyclopropane, Dimethyleneimine, Dihydroazirene, Azirane, Aziran, Aethylenimin, Dihydroazirine, Ethyleenimine, Aziridin.

Structurally related

Molecules sharing this formula, or whose fingerprint is at least 40% similar to this one. Similarity is Tanimoto on Morgan fingerprints over this library only — it is a measure of structural overlap, not of how alike they behave.

1,4,7,10-Tetraazacyclododecane

C8H20N4

1,5-Diazocane

C6H14N2

Where these values came from

reference compound database9033
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.