Aluminium oxide

A summary of the most common chemical descriptors (InChI Key and SMILES codes) for Aluminium oxide are summarized together with 3D and 2D structures and relevant physico-chemical properties.

What is the Aluminium oxide?

The molecule Aluminium oxide presents a molecular formula of Al2O3 and its IUPAC name is dialuminum; oxygen(2-).

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al2O3. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide. It is commonly called alumina and may also be called aloxide, aloxite, or alundum depending on particular forms or applications..

3D structure

Cartesian coordinates

Geometry of Aluminium oxide in x, y and z coordinates (Å units) to copy/paste elsewhere. Generated with Open Babel software.

2D drawing


Aluminium oxide PNEYBMLMFCGWSK-UHFFFAOYSA-N chemical compound 2D structure molecule svg
Aluminium oxide


Molecule descriptors

IUPAC namedialuminum; oxygen(2-)
InChI codeInChI=1S/2Al.3O/q2*+3;3*-2

Other names (synonyms)

IUPAC nomenclature provides a standardized method for naming chemical compounds. Although this system is widely used in chemistry, many chemical compounds have also other names commonly used in different contexts. These synonyms can come from a variety of sources and are used for a variety of purposes.

One common source of synonyms for chemical compounds is the common or trivial names, assigned on the basis of appearance, properties, or origin of the molecule.

Another source of synonyms are historical or obsolete names employed in the past, however replaced nowadays by more modern or standardized names.

In addition to common and historical names, chemical compounds may also have synonyms that are specific to a particular field or industry.

Reference codes for other databases

There exist several different chemical codes commonly used in orded to identify molecules:

Physico-Chemical properties

IUPAC namedialuminum; oxygen(2-)
Molecular formulaAl2O3
Molecular weight101.96
Melting point (ºC)2,040
Boiling point (ºC)2,980
Density (g/cm3)4.000
Molar refractivity
Topological polar surface area3.0

LogP and topological polar surface area (TPSA) values were estimated using Open Babel software.

The n-octanol/water partition coeficient (Kow) data is applied in toxicology and drug research. Kow values are used, to guess the environmental fate of persistent organic pollutants. High partition coefficients values, tend to accumulate in the fatty tissue of organisms. Molecules with a log(Kow) (or LogP) greater than 5 are considered to bioaccumulate.

TPSA values are the sum of the surface area over all polar atoms or molecules, mainly oxygen and nitrogen, also including hydrogen atoms.

In medicinal chemistry, TPSA is used to assess the ability of a drug to permeabilise cells.

For molecules to penetrate the blood-brain barrier (and act on receptors in the central nervous system), TPSA values below 90 Å2 are required. Thus, molecules with a polar surface area greater than 140 Å2 tend to be poorly permeable to cell membranes.