1309-33-7

Basic information

• Product Name: YELLOW IRON OXIDE
• Synonyms: Fe(OH)3;Iron hydroxide (Fe(OH)3);ironhydroxide(fe(oh)3);irontrihydroxide;FERRISPEC(R) PL COLOR YELLOW IRON OXIDE;FERRISPEC(TM) GC;FERRIC HYDROXY OXIDE;GOETHITE
• CAS NO: 1309-33-7
• Molecular Formula: FeO₃
• Molecular Weight: 88.85
• EINECS: 243-746-4
• Product Categories: Inorganics;WATER TREATMEMT CHEMICAL
• Mol File: 1309-33-7.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 100 °C at 760 mmHg
• Appearance: /crystalline
• Density: 3.120
• Water Solubility: insoluble H2O, alcohol, ether; soluble acids [HAW93]
• CAS DataBase Reference: YELLOW IRON OXIDE(CAS DataBase Reference)
• NIST Chemistry Reference: YELLOW IRON OXIDE(1309-33-7)
• EPA Substance Registry System: YELLOW IRON OXIDE(1309-33-7)

Safety Data

• Hazardous Substances Data: 1309-33-7(Hazardous Substances Data)

Usage

Physical Properties

Red-brown amorphous powder; density 3.40g/cm3; soluble in acids; insoluble in water and alcohol.

Uses

The compound is used in pigments and in water purifications.

Preparation

Iron(III) hydroxide is obtained as a brown gelatinous precipitate by adding a strong base to a solution of iron(III) salt: FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl

Chemical Properties

brown flocculant precipitate; used in water purification, manufacturing pigments [HAW93]

Definition

YELLOW IRON OXIDE: a yellow-brown mineral,FeO.OH, crystallizing in the orthorhombicsystem. It is formed as aresult of the oxidation and hydrationof iron minerals or as a direct precipitatefrom marine or fresh water (e.g.in swamps and bogs). Most limoniteis composed largely of cryptocrystallinegoethite. Goethite is mined asan ore of iron.

InChI:InChI=1S/Fe.3H2O/h;3*1H2/q+3;;;/p-3

Synthetic route

iron(III) oxide + oxygen (80937-33-3) → iron trioxide (1309-33-7)

Conditions	Yield
In neat (no solvent) Irradiation (UV/VIS); Fe2O3 laser evapd., reacted with O2/Ar mixt., condensed at 6 K onto CsI window, annealed at 25 K, UV-irradiated (mechanism discussed); not isolated, detcd. by IR;

oxygen (80937-33-3) + iron (7439-89-6) → iron trioxide (1309-33-7)

Conditions	Yield
In neat (no solvent) Irradiation (UV/VIS); Fe laser evapd., reacted with O2/Ar mixt., condensed at 6 K onto CsI window, annealed at 25 K, UV-irradiated (mechanism discussed); not isolated, detcd. by IR;

Upstream product

• 80937-33-3 oxygen 
• 7439-89-6 iron 

Relevant articles and documents

Formation and characterization of two FeO3 isomers in solid argon

Two FeO3 isomers were prepared and characterized using matrix isolation infrared spectroscopy and theoretical calculations. The iron monoxide molecules produced from laser evaporation of the bulk iron oxide target react with dioxygen in solid argon to form the (η2-O2)FeO complex spontaneously on annealing. The (η2-O2)FeO complex was predicted to have a 5B2 ground state with a planar C2v structure, in which the O2 fragment is side-on bonded to the iron center. The (η2-O2)FeO complex rearranges to the more stable iron trioxide isomer upon visible light (λ > 500 nm) irradiation. The iron trioxide molecule was predicted to have a closed-shell singlet ground state with a planar D3h symmetry, in which the iron possesses a +6 oxidation state.