Acetic acid metal complexes

A-Benzoyl-A-phenylhydroxylamine [304-88-1] M 213.2, m 121-122". RecrystaUise it from hot water, benzene Et20/hexane or acetic acid. It complexes with metals. [Beilstein 15 III 8,15 IV 7.]... 

Acetic acid, trimethylenediaminetetra-metal complexes equilibrium constants, 784 synthesis. 779 Acetohydroxamic acid metal complexes spectroscopy, 506 Acetohydroxamic acid, A -phenyl-metal complexes, 507 as metal precipitants, 506 Acetone oximes... 

The addition of OMe to cluster-coordinated GO has been used in the electrospray spectrometry of metal carbonyl complexes.Heterometallic clusters such as Gp Fe(GO)(/x-GO)2Ru2(GO)4(//-H) /x-MeG(GOO)Gl have been obtained upon carbonyl substitution with MeG(Gl)HGOOH on the tetra-heterometallic precursor. An efficient synthetic method for Ru3(GO)i2 starting from ruthenium dioxide hydrate has been reported in the presence of formic or acetic acid, carboxylate complexes are obtained. These favor the reductive carbonylation of nitrobenzene to aniline and A,iV -diphenylurea. 

The water of hydration of these complexes can be replaced with other coordinating solvents. For example, the ethanol and methanol solvates were made by dissolving the hydrates in triethyl and trimethyl orthoformate, respectively (81,82). The acetic acid solvates are made by treating the hydrates with acetic anhydride (83). Conductivity and visible spectra, where appHcable, of the Co, Ni, Zn, and Cu fluoroborates in A/A/-dimethylacetamide (L) showed that all metal ions were present as the MLg cations (84). Solvated fluoroborate complexes of, Fe +, Co +, , Cu +, and in diethyl... 

A second synthesis of cobyric acid (14) involves photochemical ring closure of an A—D secocorrinoid. Thus, the Diels-Alder reaction between butadiene and /n j -3-methyl-4-oxopentenoic acid was used as starting point for all four ring A—D synthons (15—18). These were combined in the order B + C — BC + D — BCD + A — ABCD. The resultant cadmium complex (19) was photocyclized in buffered acetic acid to give the metal-free corrinoid (20). A number of steps were involved in converting this material to cobyric acid (14). 

The 1 2 metal complex dyes are dyed either at neutral pH or with ammonium acetate, and the exhaustion achieved by the effect of van der Waals forces. The pH is then aUowed to go slightly acidic to form salt linkages between the dye anion and the protonated primary amine groups in the wool (NH3 ). AU the dyes have similar dyeing properties and the conditions of appHcation do not damage the wool. 

Pyrocatechol Violet (tetraphenolictriphenylmethanesulfonic acid Na salt) [115-41-3] M 386.4, e 1.4 x 1(H at 445nm in acetate buffer pH 5.2-5.4, pKesi(i)>0 (SO3H), pK ,t(2) 9.4, pKEst(3) 13. It was recrystd from glacial acetic acid. Very hygroscopic. Indicator standard for metal complex titrations. [Mustafin et al. Zh Anal Khim 22 1808 1967.]... 

The formation of a single complex species rather than the stepwise production of such species will clearly simplify complexometric titrations and facilitate the detection of end points. Schwarzenbach2 realised that the acetate ion is able to form acetato complexes of low stability with nearly all polyvalent cations, and that if this property could be reinforced by the chelate effect, then much stronger complexes would be formed by most metal cations. He found that the aminopolycarboxylic acids are excellent complexing agents the most important of these is 1,2-diaminoethanetetra-aceticacid (ethylenediaminetetra-acetic acid). The formula (I) is preferred to (II), since it has been shown from measurements of the dissociation constants that two hydrogen atoms are probably held in the form of zwitterions. The values of pK are respectively pK, = 2.0, pK2 = 2.7,... 

Tri-n-butyl phosphate, ( -C4H9)3P04. This solvent is useful for the extraction of metal thiocyanate complexes, of nitrates from nitric acid solution (e.g. cerium, thallium, and uranium), of chloride complexes, and of acetic acid from aqueous solution. In the analysis of steel, iron(III) may be removed as the soluble iron(III) thiocyanate . The solvent is non-volatile, non-flammable, and rapid in its action. 

Ethylenediaminetetra-acetic acid, largely as the disodium salt of EDTA, is a very important reagent for complex formation titrations and has become one of the most important reagents used in titrimetric analysis. Equivalence point detection by the use of metal-ion indicators has greatly enhanced its value in titrimetry. 

The cobalt complex is usually formed in a hot acetate-acetic acid medium. After the formation of the cobalt colour, hydrochloric acid or nitric acid is added to decompose the complexes of most of the other heavy metals present. Iron, copper, cerium(IV), chromium(III and VI), nickel, vanadyl vanadium, and copper interfere when present in appreciable quantities. Excess of the reagent minimises the interference of iron(II) iron(III) can be removed by diethyl ether extraction from a hydrochloric acid solution. Most of the interferences can be eliminated by treatment with potassium bromate, followed by the addition of an alkali fluoride. Cobalt may also be isolated by dithizone extraction from a basic medium after copper has been removed (if necessary) from acidic solution. An alumina column may also be used to adsorb the cobalt nitroso-R-chelate anion in the presence of perchloric acid, the other elements are eluted with warm 1M nitric acid, and finally the cobalt complex with 1M sulphuric acid, and the absorbance measured at 500 nm. 

Acetic acid, fram-cyclohexanediaminetetra-metal complexes, 1,554... 

Acetic acid, tr nj-l,2-cyclohexylenediiminotetra-metal complexes, 2,786 Acetic add, 1,2-diaminocyclohexanetetra-alkaline earth metal complexes, 3,32 Acetic add, ethylenebis[(carboxymethyl)unino-ethyleneiminojtetra-metal complexes equilibrium data, 2,788 stability, 2,787... 

Acetic acid, ethylenebis(oxyethyleneimino)tetra-metal complexes stability, 2, 786... 

Acetic acid, ethylenenitrilo[(hydroxyethyl)nitrilo]tri-iron(III) complexes, 2,788 Acetic acid, hexamethylenediaminetetra-synthesis, 2,779 Acetic acid, iminodi-chelating resins mineral processing, 6,824 metal complexes, 1,554 2, 788... 

Acetic acid, pentamethylenediaminetetra-metal complexes. equilibrium constants, 2, 784 Acetic acid, tetramethylenediaminetetra-metal complexes equilibrium constants, 2,784 synthesis, 2, 779... 

Scandium, Sc, which was first isolated in 1937, is a reactive metal it reacts with water about as vigorously as calcium does. It has few uses and is not thought to be essential to life. The small, highly charged Sc3+ ion is strongly hydrated in water (like Al3+), and the resulting Sc(H2())6]3+ complex is about as strong a Bronsted acid as acetic acid. 

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