Iron, hexacyano

Crespo, I., Barriga, C., Rives, V. and Ulibarri, M. A. (1997). Intercalation of iron hexacyano complexes in Zn,Al-hydrotalcite. Solid State Ionics 101, 729. 

Copper ferrocyanide complex salts, which are occasionally used, are derived from copper-l-hexacyano-iron-2-acid HCu3[Fe(CN)6], Three equivalents of copper are required for each unit of ferrocyanide, which furnishes the following general pigment structure ... 

CF represents copper ferrocyanide (copper-l-hexacyano-iron-II-acid). 

The stabilization of Fe by 1,4,7-triathiacyclononane, ([9]-ane-S3, ttcn= (297), has permitted the preparation of the first authentic example of a Turnbull s Blue, i.e., an iron(II)-hexacyano-ferrate(lll) combination, in the form of [Fe(ttcn)2][Fe(CN)6] 2H20. This so-called Ukrainian Red, named in honor of the country of origin of several of the authors, is a valence-trapped (Robin and Day class compound. The redox potential for the [Fe(ttcn)2] " couple is... 

Cyanide ion, and hence nitrogen in the sample, may be detected by the Prussian Blue test. The filtered alkaline solution, resulting from the action of water upon the sodium fusion, is treated with iron(n) sulphate and thus forms sodium hexacyanoferrate(n). Upon boiling the alkaline iron(n) salt solution, some iron(m) ions are inevitably produced by the action of air upon addition of dilute sulphuric add, thus dissolving the iron(n) and (hi) hydroxides, the hexa-cyanoferrate(n) reacts with the iron(m) salt producing iron(m) hexacyano-ferrate(n), Prussian blue ... 

Hexacyanoferrate(III). Acidify 1 ml of the soda extract with dilute hydrochloric acid and add a few drops of freshly prepared iron(II) sulphate solution. A deep-blue precipitate indicates hexacyanoferrate(III) present. This precipitate should not be confused with that of light-grey-blue colour produced by a hexacyano-ferrate(II). 

Toxico-kinetic studies showed, that the adsorption of iron blue pigments is very low. Following intravenous injection of a Fe radio-labeled iron blue pigment, the Fe(CN)6- ion was rapidly and virtually completely excreted with the urine. After oral administration of ferric hexacyanoferrate ( Fe) approx. 2% of the labeled hexacyano-ferrate ion was adsorbed by the gastro-intestinal tract [3.199]. Most of the substance is excreted with the feces [3.200] and there was no evidence of its decomposition. 

The pentacyanonitrosylferrates, (the nitroprussides ) are of interest. Cyano complexes in general do not easily form mixed complexes by replacement of CN" groups and, in the hexacyano-complexes of iron, only one CN" can be replaced by NH3, HgO, CO, NOg (nitro) or NO (nitroso). Acidification of a K4Fe(CN)g--KN02 mixture gives first the pentacyanonitro-ferrate(II) ion, [Fe(CN)5N02] " ... 

A freshly prepared solution of lOg iron-IlI-chloride and 0.5g potassium hexacyano-lerrate in 100ml water. The plate is sprayed with 5-8ml. Evaluation in vis. 

If iron(III) chloride is added to an excess of potassium hexacyano-ferrate(II), a product with the composition KFe[Fe(CN)g] is formed. This tends to form colloidal solutions ( Soluble Prussian Blue ) and cannot be filtered. 

Potassium hexacyanoferrate(III) a brown colouration is produced, due to the formation of an undissociated complex, iron(III) hexacyano-ferrate(III) ... 

M. See Glucose oxidase Fermenzyme L-200. See Amyloglucosidase Ferralyte 8131. See Ferric sulfate Ferrate (4-), hexacyano-, tetrapotassium. See Potassium ferrocyanide Ferrate(3-), hexacyano-, tripotassium. See Potassium ferricyanide Ferrate(4-), hexakis(cyano-C)-, iron(3+) (3 4). 

Weisz has applied this type of amplification reaction to the determination of phosphate, hexacyano-ferrate(II), chromate, zinc, iron, and silver, and has obtained amplification factors up to 153 in a series of cyclic processes carried out in an automated form. 

N. (2010) Ultrasensitive sensing of N-acetyl-cysteine using an electrocat-alytic transducer of nanoparticles of iron(III) oxide core-cobalt hexacyano-ferrate shell. Sens. Actuators, B, 145, 185-193. 

Co(NH3)4(N02)2]Cl 23.29 Hexacyano means that there are six CN Ugands bonded to the iron cation. The Roman numeral II means that the oxidation state of the iron cation is +2, so that the overall charge of the complex ion is —4. This requires four potassium ions to counterbalance the —4 charge. 

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