Chromium(III) perchlorate

Chromium(III) perchlorate
Names
	Other names Chromium(III) perchlorate; Chromium triperchlorate
Identifiers
CAS Number	13537-21-8; hexahydrate: 55147-94-9;
3D model (JSmol)	Interactive image; hexahydrate: Interactive image;
ChemSpider	55552; hexahydrate: 21241320;
EC Number	236-905-4;
PubChem CID	61644; hexahydrate: 12987845;
CompTox Dashboard (EPA)	DTXSID40890669; hexahydrate: DTXSID00514430;
	InChI InChI=1S/3ClHO4.Cr/c32-1(3,4)5;/h3(H,2,3,4,5);/q;;;+3/p-3 Key: ZKJMJQVGBCLHFL-UHFFFAOYSA-K; hexahydrate: InChI=1S/3ClHO4.Cr.6H2O/c32-1(3,4)5;;;;;;;/h3(H,2,3,4,5);;6*1H2/q;;;+3;;;;;;/p-3 Key: AWECJTDFTJYSGZ-UHFFFAOYSA-K;
	SMILES [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Cr+3]; hexahydrate: O.O.O.O.O.O.[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Cr+3];
Properties
Chemical formula	Cr(ClO4)3
Molar mass	350.3489
Appearance	cyan solid
Solubility in water	anhydrous: 58 g/100 mL (25 °C); hexahydrate: 130 g/100 mL (20 °C)
Solubility	soluble in ethanol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	poisonous
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H315, H319, H335
Related compounds
Related compounds	chromium(III) chloride; chromium chlorate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chromium(III) perchlorate is an inorganic compound, a salt with the chemical formula Cr(ClO₄)₃. It's hexahydrate Cr(ClO₄)₃·6H₂O is a cyan solid that dissolves in water.

Preparation

Chromium perchlorate can prepared by reacting chromium(III) oxide or chromium(III) hydroxide with perchloric acid:

Cr₂O₃ + 6HClO₄ → 2Cr(ClO₄)₃ + 3H₂O

Hydrates

Chromium perchlorate has many hydrates, such as the hexahydrate Cr(ClO₄)₃·6H₂O^[1] and a nonahydrate Cr(ClO₄)₃·9H₂O.^[3] All of them are cyan substances that are soluble in water.

Related compounds

Cr(ClO₄)₃ will react with NH₃ in suitable conditions to form an orange hexammine complex Cr(ClO₄)₃·6NH₃.^[4] Other compounds with the general formula Cr(ClO₄)₃(NH₃)_x are also known. When x = 3, this compound is red, when x = 4 or 5, it is orange.^[5] The hexammine complex will explode.^[5]

Cr(ClO₄)₃ can also form complexes with N₂H₄, such as purple Cr(ClO₄)₃·2N₂H₄.^[6]

Cr(ClO₄)₃ can also form complexes with urea (CO(NH₂)₂), such as Cr(ClO₄)₃·6CO(NH₂)₂ with a hexagonal structure.^[7]

References

^ ^a ^b William M. Haynes, ed. (2016). CRC Handbook of Chemistry and Physics (97 ed.). CRC Press. pp. 4–57. ISBN 9781498754293.
^ Elements, American. "Chromium Perchlorate Hexahydrate". American Elements. Retrieved 11 December 2021.
^ Chromium Perchlorate
^ Handbook of inorganic substances 2017 – Google Sách.
^ ^a ^b Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3278. ISBN 978-0-412-30120-9.
^ chemistry-chemists.com https://web.archive.org/web/20200326015850/http://chemistry-chemists.com/chemister/Neorganika/inorganic-hydrazine-derivatives-2014.pdf. Archived from the original on 2020-03-26. {{cite web}}: Missing or empty |title= (help)
^ Barbieri, G. A. (17 September 1913). "Über Eisen-Harnstoffverbindungen" (PDF). Chemisches Zentralblatt (12): 1035.

[crc-1] William M. Haynes, ed. (2016). CRC Handbook of Chemistry and Physics (97 ed.). CRC Press. pp. 4–57. ISBN 9781498754293.

[2] Elements, American. "Chromium Perchlorate Hexahydrate". American Elements. Retrieved 11 December 2021.

[3] Chromium Perchlorate

[4] Handbook of inorganic substances 2017 – Google Sách.

[:0-5] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3278. ISBN 978-0-412-30120-9.

[6] chemistry-chemists.com https://web.archive.org/web/20200326015850/http://chemistry-chemists.com/chemister/Neorganika/inorganic-hydrazine-derivatives-2014.pdf. Archived from the original on 2020-03-26. {{cite web}}: Missing or empty |title= (help)

[7] Barbieri, G. A. (17 September 1913). "Über Eisen-Harnstoffverbindungen" (PDF). Chemisches Zentralblatt (12): 1035.

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