Prussian Blue
Title: Prussian Blue
CAS Registry Number: 14038-43-8; 12240-15-2 (unspecified formula)
CAS Name: (OC-6-11)-Iron(3+) (3:4) hexakis(cyano-kC) ferrate(4-)
Additional Names: ferric ferrocyanide; ferric hexacyanoferrate(II); iron(III) hexacyanoferrate(4-); C.I. 77510; Berlin blue; Chinese blue; Hamburg blue; insoluble Prussian blue; Iron blue; Milori blue; Paris blue
Trademarks: Radiogardase (Heyl)
Molecular Formula: C18Fe7N18
Molecular Weight: 859.23
Percent Composition: C 25.16%, Fe 45.50%, N 29.34%
Line Formula: Fe4[Fe(CN)6]3
Literature References: Discovered by Diesbach in 1704; one of the first synthetic coordination compounds and modern colors. The structure consists of alternating ferric and ferrous ions on face centered cubic lattice sites; the remaining charge is balanced by potassium or ferric ions. Early characterization: J. Brown, Philos. Trans. 33, 17 (1724). Prepn: Colour Index vol. 4 (3rd ed, 1971) p 4673. Structural study: J. F. Keggin, F. D. Miles, Nature 137, 577 (1936). Crystal structure: H. J. Buser et al., Inorg. Chem. 16, 2704 (1977). Physicochemical properties and efficacy in thallium poisoning: J. Kravzov et al., J. Appl. Toxicol. 13, 213 (1993). Review of toxicology: J. Pearce, Food Chem. Toxicol. 32, 577-582 (1994); of clinical efficacy in radiocesium poisioning: D. F. Thompson, C. O. Church, Pharmacotherapy 21, 1364-1367 (2001); of use in chemical and biological sensors: R. Koncki, Crit. Rev. Anal. Chem. 32, 79-96 (2002).
Properties: Purple powder. d 1.75-1.81. Soly (mg/ml): water 6; ethanol 20. Slightly sol in most organic solvents. Sol in oxalic acid; precipitates on exposure to light. Absorption max (water): 694 nm.
Absorption maximum: Absorption max (water): 694 nm
Density: d 1.75-1.81
 
Derivative Type: Ammonium Ferric Hexacyanoferrate
CAS Registry Number: 25869-00-5
Additional Names: Ferric ammonium ferrocyanide
Molecular Formula: C6H4Fe2N7
Molecular Weight: 285.83
Percent Composition: C 25.21%, H 1.41%, Fe 39.08%, N 34.30%
Line Formula: NH4Fe[Fe(CN)6]
Properties: LD50 orally in mice: >5 g/kg (Pearce).
Toxicity data: LD50 orally in mice: >5 g/kg (Pearce)
 
Derivative Type: Potassium Ferric Ferrocyanide
CAS Registry Number: 25869-98-1
Additional Names: C.I. 77520; C.I. Pigment Blue 27; iron(III) potassium hexacyanoferrate(4-); soluble Prussian blue
Molecular Formula: C6Fe2KN6
Molecular Weight: 306.89
Percent Composition: C 23.48%, Fe 36.39%, K 12.74%, N 27.38%
Line Formula: KFe[Fe(CN)6]
 
Use: As pigment in printing inks, paints, alkyd resin enamels, linoleum, leathercloth, carbon papers, typewriter ribbons, plastics, artists' colors; in chemical and biological sensors.
Therap-Cat: Antidote (radioactive cesium and thallium poisoning).
Keywords: Antidote (Heavy Metal Poisoning).

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