Potassium ferricyanide 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... 

Potassium hexacyanoferrate (III) (potassium ferricyanide). Dissolve 2g of the solid in 100 mL distilled water. (Solution B). 

Pour a potassium hexacyanoferrate(III) (potassium ferricyanide) solution into a Mohr s salt one. What is obtained Write the equation of the reaction. What is this reaction used for ... 

According to some authorities, the first metal ammine to be isolated in the solid state was the reddish yellow hexaamminecobalt(III) oxalate [Co(NH3)6]2(C204)3, described in 1822 by Leopold Gmelin (1788-1853).16 Gmelin also discovered several new double salts potassium ferricyanide, or potassium hexacyanoferrate(III), K3[Fe(CN)6l>17 the cobalticyanides or hexacyanocobaltates(III), M3[Co(CN) ],18 and the platinocyanides or tetracyanoplatinates(II), M2[Pt(CN)4].19All these substances certainly deserve to rank among the earliest known coordination compounds. 

Potassium hexacyanoferrate(III) (potassium ferricyanide) (0 033m). Dissolve 10-98 g potassium hexacyanoferrate(III), K3[Fe(CN)6], in water and dilute to 1 litre. 

SYNS HEXACYANOFERRATE(3-) TRIPOTASSIUM POTASSIUM FERRICYANIDE POTASSIUM HEXACYANOFERRATE(III) TRIPOTASSIUM HEXACYANOFERRATE... 

Potassium ferricyanide [potassium hexacyanoferrate(lll)], K3Fe-(CN), in the presence of a base, dehydrogenates hydroaromatic compounds to aromatic compounds [919] and can cause dehydrogenative cy-clizations [920]. The reagent is used for the conversion of acid hydrazides into aldehydes [921], of sterically hindered phenols into phenoxy radicals [922, 923], and of primary amines into nitriles [924], Tertiary amines are demethylated to secondary amines [925, 926]. 

The existence of homoerythrina alkaloids has been anticipated from biosynthetic considerations. Homoerythrina dienone 77 was synthesized in the following way. Oxidation of the diphenolic isoquinoline 86 with vanadium oxytrichloride in methylene chloride afforded the expected prohomoerythrinadienone 87 (47), which was transformed to the imine 88 in quantitative yield by 1 N sodium hydroxide at 0°C. Sodium borohydride reduction of the iminium chloride of 88 gave 76. Oxidative phenolic coupling of 76 with potassium hexacyanoferrate in methylene chloride afforded homoerythrina dienone 77 in 45% yield and homoery-sodienone 89a in 15% yield (48). Moreover, the lactam dienone 91 was prepared in excellent yield by oxidation of the N-acyltetrahydroquinoline 90 with potassium ferricyanide (49). 

POTASSIUM FERRICYANATE, POTASSIUM FERRICYANIDE, or POTASSIUM HEXACYANOFERRATE(IH) (13746-66-2) Mixtures with water, acids, alcohols cause slow decomposition, producing hydrocyanic acid. Explosive reaction with ammonia. Violent reaction with copp)er(II) nitrate, trihydrate. Incompatible with chromium trioxide, sodium nitrite. 

K3Fe(CN), potassium ferricyanide) is an orange crystalline compound. Its solution gives a deep blue precipitate with iron(II) ions, and is used as a test for iron(II) (ferrous) compounds. Prassian blue is a blue pigment containing hexacyanoferrate ions. 

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 (III). See Potassium ferricyanide Potassium 2,4-hexadienoate. See Potassium sorbate... 

Tripotassium hexacyanoferrate Tripotassium hexakis (cyano-C) ferrate (3-). See Potassium ferricyanide Tripotassium hydrogen ethylenediaminetetraacetate. See Tripotassium EDTA Tripotassium 2-hydroxypropane-1,2,3-tricarboxylate. See Potassium citrate Tripotassium orthophosphate Tripotassium phosphate. See Potassium phosphate tribasic... 

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... 

Potassium Ferricyanide Potassium Hexacyanoferrate (III) Lead Sulfamate Calcium Bisulfite... 

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. 

Iron Blue, Cl Pigment Blue 27, which has been known by various names over the years, perhaps the best known being Prassian Blue, is ferric ammonium ferricyanide, FeNH Fe(CN)g(xH20. The hrst step in its preparation involves the precipitation of complex iron(ii) cyanides, e.g. potassium hexacyanoferrates(ii) with iron(i) salts, e.g. the sulfate or chloride, in an aqueous solution in the presence of ammonium... 

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]. 

If one pyrolyzes Prussian blue gently in a vacuum or, better, precipitates ferrous ferricyanide in the presence of a reducing agent such as potassium iodide or sucrose, the compound formed is truly iron(II) hexacyanoferrate(III). 5 However, it reverts to Prussian blue rapidly upon warming with dilute hydrochloric acid or standing in humid air. 

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... 

In the separation of caesium, the following inorganic cation exchangers are particularly useful potassium cobalt(II) hexacyanoferrate(II) [12,13], potassium copper(II) and nickel(II) hexacyanoferrates(II) [14], ammonium molybdophosphate [13,15], zirconium molybdoarsenate [16], thallium tungstophosphate [17], and tin molybdosilicate [18]. Rubidium has been selectively isolated on columns filled with titanium tungstoarsenate [19] or titanium ferricyanide [20]. Ammonium molybdoarsenate has been used to separate potassium from sodium [21]. 

Calcium hexacyanoferrate is usually converted into either the sodium and potassium salts, or into the hexacyanoferrates (III) (otherwise known as ferricyanides, [Fe(CN)6] ). It is used in the production of blue pigments and salt (as an anti-caking agent). 

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