Ferric ferrocyanide

Prussian blue

Names
IUPAC name Iron(II,III) hexacyanoferrate(II,III)
Other names Berlin blue Ferric ferrocyanide Ferric hexacyanoferrate Iron(III) ferrocyanide Iron(III) hexacyanoferrate(II) Parisian blue
Identifiers
CAS Number	14038-43-8 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30069 Y
ChemSpider	20074656 Y
ECHA InfoCard	100.034.418
EC Number	237-875-5
Gmelin Reference	1093743
PubChem CID	2724251
UNII	TLE294X33A Y
InChI InChI=1S/18CN.7Fe/c18*1-2;;;;;;;/q;;;;;;;;;;;;;;;;;;3*-4;4*+3 Y Key: DNMNDNSFJMUUFM-UHFFFAOYSA-N Y InChI=1S/18CN.7Fe/c18*1-2;;;;;;;/q;;;;;;;;;;;;;;;;;;3*-4;4*+3 Key: DNMNDNSFJMUUFM-UHFFFAOYSA-N
SMILES [Fe+3].[Fe+3].[Fe+3].[Fe+3].N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N.N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N.N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N
Properties
Chemical formula	C18Fe7N18
Molar mass	859.24 g·mol−1
Appearance	Blue opaque crystals
Pharmacology
ATC code	V03AB31 (WHO)
Routes of administration	Oral
Hazards
Safety data sheet	MSDS prussian blue
Related compounds
Other cations	Potassium ferrocyanide Sodium ferrocyanide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Prussian blue
Color coordinates
Hex triplet	#003153
sRGBB  (r, g, b)	(0, 49, 83)
CMYKH   (c, m, y, k)	(100, 41, 0, 67)
HSV       (h, s, v)	(205°, 100%, 32%)
Source	[1]
B: Normalized to [0–255] (byte) H: Normalized to [0–100] (hundred)

Ferric ferrocyanide
Ferric hexacyanoferrate
Iron(III) ferrocyanide
Iron(III) hexacyanoferrate(II)

Sodium ferrocyanide

Prussian blue is a dark blue pigment with the idealized chemical formula Fe
7(CN)
18. To better understand the binding situation in this complex compound the formula can also be written as Fe
4[Fe(CN)
6]
3 · xH
2O. Another name for the color is Berlin blue or, in painting, Parisian or Paris blue. Turnbull's blue is the same substance, but is made from different reagents, and its slightly different color stems from different impurities.

Prussian blue was the first modern synthetic pigment. It is employed as a very fine colloidal dispersion, as the compound itself is not soluble in water. It is famously complex, owing to the presence of variable amounts of other ions and the sensitive dependence of its appearance on the size of the colloidal particles formed when it is made. The pigment is used in paints, and it is the traditional "blue" in blueprints and aizuri-e Japanese woodblock prints.

In medicine, Prussian blue is used as an antidote for certain kinds of heavy metal poisoning, e.g., by thallium and radioactive isotopes of caesium. In particular it was used to absorb 137
Cs+
from those poisoned in the Goiânia accident. Prussian blue is orally administered. The therapy exploits Prussian blue's ion exchange properties and high affinity for certain "soft" metal cations.