Potassium ferrocyanide hexacyanoferrate

The simplest class of reaction of coordination compounds which has been studied is that of electron-transfer reactions. Suppose that a solution of potassium ferrocyanide (hexacyanoferrate(II)) is mixed with one of potassium ferricyanide (hexacyanoferrate(III)), then if an [Fe(CN)g] anion loses an electron and an [Fe(CN)6] anion gains one, a chemical reaction has occurred, although there is no change in the composition of the mixture. If one of the atoms in just one of the complex ions is labelled in some way—with for example—then the reaction may be studied by seeing... 

Ferric ferrocyanide—Cl Pigment Blue 27, Cl No. 77510. The color additive ferric ferrocyanide is a ferric hexacyanoferrate is a pigment characterized by the stmctural formula Fe4[Fe(CN)g]2ArH20, which may contain small amounts of ferric sodium ferrocyanide and ferric potassium ferrocyanide. ... 

Hexacyanoferric(II) acid, ferrocyanic acid or tetrahydrogen hexakis(cyanate-(4-)) [17126-47-5] is used to prepare many adducts with oxygen-containing organics. Also addition compounds with inorganic salts are known. This acid may be obtained as a white precipitate upon addition of potassium ferrocyanide to concentrated hydrochloric acid ... 

Pour 1-2 ml of an iron(III) chloride solution into each of two test tubes. Add several drops of an ammonium thiocyanate solution to one of the tubes, and a potassium hexacyanoferrate(II) (potassium ferrocyanide) solution to the other one. What happens Write the equations of the reactions. What are these reactions used for ... 

The formula for potassium arsenate is K3As04. The formula for potassium ferrocyanide, systematically called potassium hexacyanoferrate(II), is K4Fe(CN)g. Write the formulas for (a) calcium arsenate ib) iron(III) arsenate ... 

Use a 0 025m solution of potassium hexacyanoferrate(II), (often called potassium ferrocyanide), K4[Fe(CN)6]. 3H20, to study these reactions. 

SYNS FERRATE(4-), HEXACYANO-,TETR. POTASS-lUM FERRATE(4-), HEXAKIS(CYANO-C)-, TETRAPOTASSIUM, (OC-6-11)- POTASSIUM FERROCYANATE POTASSIUM FERROCYANIDE POTASSIUM HEXACYANOFERRATE POTASSIUM HEXACYANOFER-RATEgi) TETRAPOTASSIUM FERROCYANIDE ... 

Other reoxidants which minimize overoxidation are f-butyl hydroperoxide in the presence of Et4NOH [4], tertiary amine oxides, and most importantly N-methylmorpholine A -oxide (NMO) (Upjohn process) [14], although for tri- and particularly tetrasubstituted alkenes as substrates, trimethylaminoxide is superior to NMO [14 c], The introduction of potassium hexacyanoferrate(III) in the presence of potassium carbonate [15] substantially improved the selectivities in chiral dihydroxylations [16], although it was first reported as a co-oxidant in 1975 [17]. Industrial efforts led to an electrochemical oxidation of potassium ferrocyanide to ferricyanide in order to use electricity as the actual co-oxidant [18]. 

Potassium hexacyanoferrate(II) (potassium ferrocyanide) (0.02Sm). Dissolve 10.5 g potassium hexacyanoferrate(II) trihydrate, I [Fe(CN)5]-3H20, in water and dilute to 1 litre. 

Since a main objective of the test is to differentiate between Fe + and Fe ", and since this is obtained by using Fe and Fe + reagents, it is important to recapitulate how these compoxmds are named. Iron in oxidation level two, Fe ", is called iron(ll), and its salts are called ferro compoxmds (e.g., potassium ferrocyanide) or ferrate(ll) compounds (hexacyanoferrate(ll)). Iron in oxidation level three, Fe , is called iron(lll), and its salts are called ferri compoxmds (e.g., potassium ferricyanide) or ferrate(lll) compoxmds (hexa-cyanoferrate(lll)). 

These complexes are so stable that the iron can be liberated only by radical procedures such as boiling the solution with concentrated sulphuric acid, and their potassium salts are then easily isolated. These salts are used as reagents, so that the potassium hexacyanoferrate(in) (potassium ferricyanide) is used to identify iron(ll), and potassium hexacyanoferrate(II) (potassium ferrocyanide) is used to identify iron(III). 

Potassium ferricyanate. See Potassium ferricyanide Potassium ferricyanide CAS 13746-66-2 EINECS/ELINCS 237-323-3 Synonyms Ferrate(3-), hexacyano-, tripotassium Hexacyanoferrate (3-) tripotassium Potassium ferricyanate Potassium ferrocyanide Potassium... 

Potassium hexacyanoferrate Potassium hexacyanoferrate (II). See Potassium ferrocyanide... 

Potassium hexacyanoferrate(ll) (potassium ferrocyanide) [Pg.1007]

Potassium Acetate Potassium Acid Sulfate Potassium Acid Tartrate Potassium Antimonate Potassium Bicarbonate Potassium Bichromate Potassium Bisulfate Potassium Bisulfite Potassium Bitartrate Potassium Borate Potassium Bromate Potassium Bromide Potassium Carbonate Potassium Chlorate Potassium Chloride Potassium Chromate Potassium Cyanide Potassium Dichromate Potassium Ferricyanide Potassium Ferrocyanide Potassium Fluoride Potassium Hexacyanoferrate (III) Potassium Hydrogen Carbonate Potassium Hydrogen Sulfate Potassium Hydrogen Sulfite Potassium Hydroxide Potassium Hypochlorite Potassium Hyposulfite Potassium lodate Potassium Iodide Potassium Manganate Potassium Nitrate Potassium Perborate Potassium Perchlorate Potassium Permanganate Potassium Peroxydisulfate Potassium Persulfate... 

Eastman 910 Potassium Ferricyanide Potassium Hexacyanoferrate (III) Calcium Bisulfite Calcium Nitrite Ammonium Fluoroborate Limonene Aluminum Acetate Potassium Ferrocyanide 2-Aminobutane sec-Butylamine Benzyl Acetate Phenylmethylacetate Ferrous Nitrate Iron (II) Nitrate... 

Hexa.cya.no Complexes. Ferrocyanide [13408-63 ] (hexakiscyanoferrate-(4—)), (Fe(CN) ) , is formed by reaction of iron(II) salts with excess aqueous cyanide. The reaction results in the release of 360 kJ/mol (86 kcal/mol) of heat. The thermodynamic stabiUty of the anion accounts for the success of the original method of synthesis, fusing nitrogenous animal residues (blood, horn, hides, etc) with iron and potassium carbonate. Chemical or electrolytic oxidation of the complex ion affords ferricyanide [13408-62-3] (hexakiscyanoferrate(3—)), [Fe(CN)g] , which has a formation constant that is larger by a factor of 10. However, hexakiscyanoferrate(3—) caimot be prepared by direct reaction of iron(III) and cyanide because significant amounts of iron(III) hydroxide also form. Hexacyanoferrate(4—) is quite inert and is nontoxic. In contrast, hexacyanoferrate(3—) is toxic because it is more labile and cyanide dissociates readily. Both complexes Hberate HCN upon addition of acids. 

A paradigmatic example is provided by an extensively used pigment Pmssian blue— potassium-iron(III) hexacyanoferrate(II), also called potassium-iron(III) fer-rocyanide. This is constituted by potassium-iron(III) ferrocyanide, KFe[Fe(CN)g], whose electrochemistry has been extensively studied [74-77],... 

Potassium cyanide solution (POISON) yellowish-brown precipitate of iron(II) cyanide, soluble in excess reagent when a pale-yellow solution of hexacyanoferrate(II) (ferrocyanide) [Fe(CN)6]4- ions is obtained ... 

Potassimn ethyl xanthate , see Potassimn O-ethyl dithiocarbonate Potassium ethynediolate, see Potassimn acety lene-1,2-dioxide, 0990 Potassimn ferricyanide , see Potassium hexacyanoferrate(lll), 2063 Potassimn ferrocyanide , see Potassimn hexacyanoferrate(ll), 2064 Potassium fluoride hydrogen peroxidate, 4300... 

HEXAHYDRATE (10377-60-3) A powerful oxidizer. Reacts violently with dimethyl-formamide, reducing agents, combustible materials, fuels, organic substances, metal powders, potassium hexanitrocobalite(III) (C.I. pigment yellow), sodium acetylide, and easily oxidizable matter. Incompatible with aluminum, ammonium hexacyanoferrate(II), tert-butylhydroperoxide, citric acid, ethanol, ferrocyanides, hydrazinium perchlorate, isopropyl chlorocarbonate, metal phosphinates, nitrosyl perchlorate, organic azides, phosphorus, sodium thiosulfate, sulfamic acid, thiocyanates, tin(II) fluoride, and many other substances. 

Potassium Ferrocyauide. Tetrapotassium hexakis-(cyano-C)ferrate(4 —) potassium hexacyanoferrate(II) yellow prussiate of potash. C6FeK4N4 mol wt 368.34. C 19.56%, Fe 15.16%, K 42.46%, N 22.82%. K4Fe(CN)(. Re-view of properties, chemistry and syntheses The Chemistry of Ferrocyanides, American Cyanamid Co. Beacon Press, New York, 1953) 112 p. 

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