Silver ferrate

Simple ABO compounds in addition to BaTiO are cadmium titanate [12014-14-17, CdTiO lead titanate [12060-00-3] PbTiO potassium niobate [12030-85-2] KNbO sodium niobate [12034-09-2], NaNbO silver niobate [12309-96-5], AgNbO potassium iodate [7758-05-6], KIO bismuth ferrate [12010-42-3], BiFeO sodium tantalate, NaTaO and lead zirconate [12060-01 -4], PbZrO. The perovskite stmcture is also tolerant of a very wide range of multiple cation substitution on both A and B sites. Thus many more complex compounds have been found (16,17), eg, (K 2 i/2) 3 ... 

Other ions, eg, ferrate, chloride, and formate, are determined by first removing the cyanide ion at ca pH 3.5 (methyl orange end point). Iron is titrated, using thioglycolic acid, and the optical density of the resulting pink solution is measured at 538 nm. Formate is oxidized by titration with mercuric chloride. The mercurous chloride produced is determined gravimetricaHy. Chloride ion is determined by a titration with 0.1 Ai silver nitrate. The end point is determined electrometricaHy. 

Heating with the following solids, their fusions, or vapours (a) oxides, peroxides, hydroxides, nitrates, nitrites, sulphides, cyanides, hexacyano-ferrate(III), and hexacyanoferrate(II) of the alkali and alkaline-earth metals (except oxides and hydroxides of calcium and strontium) (b) molten lead, silver, copper, zinc, bismuth, tin, or gold, or mixtures which form these metals upon reduction (c) phosphorus, arsenic, antimony, or silicon, or mixtures which form these elements upon reduction, particularly phosphates, arsenates,... 

Mixtures of the ferrate ( ferricyanide ) and chromium trioxide explode and inflame when heated above 196°C. Friction alone is sufficient to ignite violently the mixture when ground with silver sand. 

To prepare metal hexacyanoferrate films, very frequently the following procedure was followed first a film of the respective metal, for example, cadmium [79], copper [80], silver [81], or nickel [82, 83] was elec-trochemically plated on the surface of a platinum electrode, and that was followed by chemical oxidation of the metal film in a solution of K3[Fe(CN)6], leading to the formation of the metal hexacyanoferrates. The same method has been used to produce films of nickel hexacyanoruthen-ate and hexacyanomanganate using the appropriate anions [83]. It is also possible to perform the oxidation of the deposited metals in solutions containing hexacyano-ferrate(II) by cyclic oxidation/reduction of the latter. In a similar way, films of copper heptacyanonitrosylferrate have been deposited [84]. 

A number of metal ions of variable valence, for example FeK, Ti111 and V11, can reduce silver. Among the more significant coordination compounds are those of iron and titanium. Iron(II) ion, in the presence of fluoride or pyrophosphate to sequester the Fem formed, is a developer. The bis(oxalato)ferrate(II) ion, [Fe(C204)2p, is also a developer in the presence of excess oxalate. 

The formation of silver ferrate(III) of empirical formula AgFe02 by reactions with iron hydroxides and silver compounds in... 

This reaction may be adapted as a delicate test for arsenic in the following manner. The test is applicable only in the absence of chromates, hexacyano-ferrate(II) and (III) ions, which also give coloured silver salts insoluble in acetic acid. 

Potassium permanganate. Dimethyl sulfide-Chlorine. Dimethyl sulfoxide. Dimethyl sulfoxide-Chlorine. Dimethylsulf-oxide Sulfur trioxide. Dipyridine chro-mium(VI) oxide. Iodine. Iodine-Potassium iodide. Iodine tris(trifluoroacetate). Iodosobenzene diacetate. Isoamyl nitrite. Lead tetraacetate. Manganese dioxide. Mercuric acetate. Mercuric oxide. Osmium tetroxide—Potassium chlorate. Ozone. Periodic acid. Pertrifluoroacetic acid. Potassium ferrate. Potassium ferricyanide. Potassium nitrosodisulfonate. Ruthenium tetroxide. Selenium dioxide. Silver carbonate. Silver carbonate-Celite. Silver nitrate. Silver oxide. Silver(II) oxide. Sodium hypochlorite. Sulfur trioxide. Thalli-um(III) nitrate. Thallium sulfate. Thalli-um(III) trifluoroacetate. Triphenyl phosphite ozonide. Triphenylphosphine dibromide. Trityl fluoroborate. 

KETONES Lithium diisopropylamide. Nickel carbonyl. Sodium tetracarbonyl-ferrate(-II). Thallium(III) nitrate. 2,4,4,6-Tetramethyl-5,6-dihydro-l,3-(4 I)-oxazine. Triphenylmethyl hexafluorophosphate. y-KETONITRILES Sodium cyanide. (3-LACTONES Silver nitrate. y-LACTONES a-Chloro-N-cyclohexylpro-panaldoxime. 

Silver nitrate solution orange-red precipitate of silver hexacyano-ferrate(III) ... 

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. 

If the anion is complex, add the sulfix -ate to the name of the metal. (Sometimes the -iuin or other Suffix of the normal name is removed before adding the -ate suffix. Some metals, such as copper, iron, gold, and silver, use the Latin stem for the metal and become cuprate, ferrate, aurate, and... 

Allylic and benzylic primary and secondary alcohols are more easily oxidized, and a number of reagents selective for these are in use, including freshly precipitated manganese dioxide, silver carbonate, dichlorodicyanoquinone, and potassium ferrate. 4-(Dimethylamino) pyridinium chlorochromate is mild and selective as demonstrated in Equation 6.26 [44]. 

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