ChemicalBook CAS DataBase List 1332-37-2

1332-37-2

Name	Iron oxide
CAS	1332-37-2
EINECS(EC#)	215-570-8
Molecular Formula	Fe2O3
Molecular Weight	159.69
MOL File	1332-37-2.mol

Chemical Properties

Definition	Pigments composed mainly of ferric oxide (Fe2O3).
density	2.66 g/cm3
storage temp.	-70°C
solubility	Aqueous Acid (Slightly)
form	Solid
color	Black
biological source	human
Dielectric constant	14.2（0.0℃）
InChI	InChI=1S/2Fe.3O/q2+3;3-2
InChIKey	LIKBJVNGSGBSGK-UHFFFAOYSA-N
SMILES	[Fe+3].[Fe+3].[O-2].[O-2].[O-2]
Uses	iron oxide (iron oxide black, red, or yellow) is an inorganic compound frequently used to add color to cosmetics. It may have some slight sun screening ability. Iron oxide can vary in color from red to brown, black to orange or yellow, depending on the purity and amount of water added. less more
EPA Substance Registry System	Iron oxide(1332-37-2)

Safety Data

RIDADR	UN 1376 4.2/ PGIII
WGK Germany	nwg
TSCA	TSCA listed
HazardClass	4.2
PackingGroup	III
Storage Class	11 - Combustible Solids

Raw materials And Preparation Products

Hazard Information

Description

As the mineral hematite, Iron oxide is the main source of iron for the steel industry. Iron oxide is easily attacked by acids. Iron(III) oxide is regularly called rust, and to some extent this label is useful, as rust shares several properties and has a comparable composition. To a chemist, though, rust is thought of as an ill-defined material, described as hydrated ferric oxide. Fe2O3 can be formed in various polymorphs.

Industrial uses

Iron oxide is the fine red abrasive component of rouge. Like tripoli, rouge is blended with various soft binders into a cake form. It is used to polish high noble metal alloys such as yellow gold alloys.

Synthesis

Iron oxide nanoparticles are produced via co-precipitation using hydrated ferric chloride, deionized water, and ammonium hydroxide, or by hydrothermal oxidation of iron[2]. Green synthesis utilizes Clove and green coffee extracts to reduce metal ions, forming zero-valent iron that oxidizes into magnetite nanoparticles, which are subsequently calcined at 550 °C to obtain stable crystalline structures[1][3].

Solubility in organics

Iron(III) oxide is insoluble in water but dissolves readily in strong acid, for example, hydrochloric and sulfuric acids. It likewise dissolves well in solutions of chelating agents such as EDTA and oxalic acid. Heating iron(III) oxides with other metal oxides or carbonates yields materials known as ferrates (ferrate (III)).

References

[1]Mohamed, A., Atta, R. R., Kotp, A. A., El-Ela, F. I. A., El-Raheem, H. A., Farghali, A., Alkhalifah, D. H. M., Hozzein, W. N., & Mahmoud, R. (2023). Green synthesis and characterization of iron oxide nanoparticles for the removal of heavy metals (Cd2+ and Ni2+) from aqueous solutions with Antimicrobial Investigation. Scientific Reports, 13(1). https://doi.org/10.1038/s41598-023-31704-7
[2]Ogbezode, J. E., Ezealigo, U. S., Bello, A., Anye, V. C., & Onwualu, A. P. (2023). A narrative review of the synthesis, characterization, and applications of iron oxide nanoparticles. Discover Nano, 18(1). https://doi.org/10.1186/s11671-023-03898-2
[3]Suppiah, D. D., Julkapli, N. M., Sagadevan, S., & Johan, M. R. (2023). Eco-friendly green synthesis approach and evaluation of environmental and biological applications of iron oxide nanoparticles. Inorganic Chemistry Communications, 152, 110700. https://doi.org/10.1016/j.inoche.2023.110700

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