Synthesis of chromium oxide

Preparation of chromium oxide (chromium(III) oxide)

250 g potassium dichromate are thoroughly mixed with 50 g of sulfur placed in a crucible covered and ignited for one hour in Muffle furnace. The green contents of the crucible are ground, boiled several times with water, filtered and dried.

Laboratory manual of inorganic preparations, by H. T. Vulte, 152-153, 1895

Preparation of chromium(III) oxide

Preparation of chromium(III) oxide

37 g of potassium dichromate are mixed intimately with 37 g of ammonium chloride in a clay crucible and heated with slowly rising temperature over a Bunsen flame in the hood until no more vapors are given off. The contents are cooled and powdered. The material is washed by decantation with successive portions of boiling water until no more test for chloride is obtained, then filtered and dried for several hours at 105-120°C. The filter cake is reground and dried again overnight. The product is a loose green powder which is not attacked by acids or alkalies, especially after ignition. Yield almost theoretical.

Inorganic laboratory preparations, by G. G. Schlessinger, 9, 1962

Preparation of chromium(III) oxide

Preparation of chromium(III) oxide

10 g of ammonium dichromate are placed in a small heap in a large (8-inch) porcelain basin. A red-hot iron wire is touched to the material; the reaction spreads throughout the mixture with incandescence and sparks and is soon completed. The loose green product is extracted with hot water until the washings are colorless and then dried at 100° C. The yield depends entirely on the completeness of the ignition; if considerable quantities of orange dichromate remain in the basin, the entire mass is reheated in an upright clamped flask until decomposition is complete.

 Inorganic laboratory preparations, by G. G. Schlessinger, 10, 1962

IUPAC Name

oxo(oxochromiooxy)chromium

InChI

InChI=1S/2Cr.3O

InChI Key

QDOXWKRWXJOMAK-UHFFFAOYSA-N

Canonical SMILES

O=[Cr]O[Cr]=O

MeSH Synonyms

chromic oxide, chromium oxide, chromium oxide hydrate, chromium oxide tetrahydrate, chromium oxide, 51Cr-labeled, chromium sesquioxide

Depositor-Supplied Synonyms

Chromia, Chromium(III) oxide, Dichromium trioxide, Chromium sesquioxide, Chrome Green, Chromium oxide (Cr2O3), Green chromium oxide, Chromic oxide pigment, Chromium(3+) oxide, Green oxide of chromium, Green cinnabar, Anadonis Green, Chrome ochre, Chrome oxide, Green rouge, Casalis Green, Leaf green, Chrome Ocher, Levanox green ga, Oxide of chromium, Green chrome oxide, Chromic Acid Green, Green chromic oxide, Pigment green 17, C-Grun [German], Chrome Green F 3, Kromex U 1, Chromium Oxide Green, Chromium oxide greens, 1308-38-9, OKhP1, Chromium Oxide Pigment, OIL GREEN, Amperit 704.0, Chrome Oxide Green BX, Chrome Oxide Green GP, Chromium(3+) trioxide, CI Pigment Green 17, Amdry 6410, Chrome oxide (Cr2O3), Chromium Oxide X1134, oxo(oxochromiooxy)chromium, 11661 Green, Chrome Oxide Green GN-M, Chromium(III) sesquioxide, C.I. Pigment Green 17, Chromium oxide (Cr8O12), Pure chromium oxide green 59, CCRIS 3182, Chromium(III) oxide (2:3), Green oxide of chromium oc-31, HSDB 1619, Cosmetic hydrophobic Green 9409, EINECS 215-160-9, PK 5304, Cosmetic micro blend chrome oxide 9229, CI 77288, P 106F10, C.I. 77288, Chromic oxide [Chromium and chromium compounds], Eskolaite, C-Grun, Chrom(III)-oxid, AC1LAOBQ, DSSTox_CID_326, Dichromium trioxide [BAN], DSSTox_RID_75514, oxo[(oxochromio)oxy]chromium, DSSTox_GSID_20326, CAS-NOCAS_20326, 634239_ALDRICH, CHEBI:48242, 203068_SIAL, 393703_SIAL, Tox21_200784, AKOS015904053, LS-7276, NCGC00248833-01, NCGC00258338-01, AN-48998, IN002086, 3B4-1947, I14-18063, 12689-83-7, 144855-63-0, 164057-73-2, 165589-75-3, 185464-26-0, 196696-68-1, 294202-64-5, 499126-69-1

Removed Synonyms

Chromium oxide, Chromium trioxide, CHROMIC OXIDE, Anhydride chromique, chromium oxide hydrate, Anhydride chromique [French], chromium oxide tetrahydrate, oxo-(oxochromiooxy)chromium, chromium oxide, 51Cr-labeled, UNII-X5Z09SU859, CID517277, C023600

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