Iron oxychloride

Iron oxychloride
Names
	IUPAC name Iron oxychloride
Identifiers
CAS Number	56509-17-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	4955733 ;
ECHA InfoCard	100.054.740
EC Number	260-233-0;
PubChem CID	6453349;
CompTox Dashboard (EPA)	DTXSID10971959 ;
	InChI InChI=1S/ClH.Fe.O/h1H;;/q;+1;/p-1 Key: YPLPZEKZDGQOOQ-UHFFFAOYSA-M ;
	SMILES O=[Fe]Cl;
Properties
Chemical formula	ClFeO
Molar mass	107.29 g·mol−1
Appearance	Vivid, dark violet, opaque crystals
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iron oxychloride is the inorganic compound with the formula FeOCl. This purple solid adopts a layered structure, akin to that of cadmium chloride.^[1] The material slowly hydrolyses in moist air. The solid intercalates electron donors such as tetrathiafulvalene and even pyridine to give mixed valence charge-transfer salts. Intercalation is accompanied by a marked increase in electrical conductivity and a color change to black.^[2]

Production

FeOCl is prepared by heating iron(III) oxide with ferric chloride at 370 °C (698 °F) over the course of several days:^[2]

Fe₂O₃ + FeCl₃ → 3 FeOCl

Alternatively, FeOCl may be prepared by the thermal decomposition of FeCl₃⋅6H₂O at 220 °C (428 °F) over the course of one hour:^[3]

FeCl₃ ⋅ 6H₂O → FeOCl + 5 H₂O + 2 HCl

^ Lind, M. D. (1970-08-15). "Refinement of the crystal structure of iron oxychloride". Acta Crystallographica Section B. 26 (8): 1058–1062. doi:10.1107/s0567740870003618.
^ ^a ^b Kikkawa, S.; Kanamaru, F.; Koizumi, M.; Rich, Suzanne M.; Jacobson, Allan (1984-01-01). Holt, Smith L. Jr. (ed.). Layered Intercalation Compounds. John Wiley & Sons. pp. 86–89. doi:10.1002/9780470132531.ch17. ISBN 9780470132531.
^ Chen, C.; Yu, T.; Yang, M.; Zhao, X.; Shen, X. (2019). "An All-Solid-State Rechargeable Chloride Ion Battery". Advanced Science. 6: 1802130. doi:10.1002/advs.201802130. PMC 6425448.

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