Iron ethylenediamine

Grinstead RR (1960) Oxidation of salicylate by the model peroxidase catalyst iron-ethylenediamine-tetraacetato-iron(lll) acid. J Am Chem Soc 82 3472-3476 Grootveld M, Halliwell B (1987) Measurement of allantoin and uric acid in human body fluids. Bio-chemJ 243 803-808... 

Use of Iron from Fe3+EDDHA (Iron-ethylenediamine di(o-hydroxy-phenylacetic acid)). Iron-inefficient T3238fer tomato developed iron deficiency because it could not absorb iron from FeEDDHA (7). In contrast, the iron-efficient T3238FER tomato used iron from FeEDDHA because it could reduce Fe3+ to Fe2+. Chaney et al. (34) showed that for... 

Analogous reactions form sodiummethyldithiocarbamate [137-42-8] from methylamine, and disodiumethylenebis(dithiocarbamate) [142-59-6] from ethylenediamine. Iron, manganese, and 2iac salts can be prepared from the sodium salts heavy metals form characteristically colored compounds with dithio c arb amate s. 

Deprotonation of enols of P-diketones, not considered unusual at moderate pH because of their acidity, is faciUtated at lower pH by chelate formation. Chelation can lead to the dissociation of a proton from as weak an acid as an aUphatic amino alcohol in aqueous alkaU. Coordination of the O atom of triethanolamine to Fe(III) is an example of this effect and results in the sequestration of iron in 1 to 18% sodium hydroxide solution (Fig. 7). Even more striking is the loss of a proton from the amino group of a gold chelate of ethylenediamine in aqueous solution (17). 

The composition of I, and possibly its structure, may be deduced by identifying Q. Certain examples from peroxide chemistry will illustrate the scope of the method. The reactions of ferrous(nitriloacetate) and ferrous(ethylenediamine-N,N -diacetate) with hydrogen peroxide are complicated processes.1 A particular scavenger T did indeed divert the reaction at high concentrations of T. The required levels of T were, however, much higher than those that would have been needed to trap the hydroxyl radical, HO. It is thereby ruled out. With this and with spectroscopic evidence, a reactive hypervalent iron complex was suggested as the intermediate. 

CEC [Chisso Engineering Company] A process for removing oxides of nitrogen from flue-gases by scrubbing with an aqueous solution containing ferrous ion and ethylenediamine tetra-acetic acid (EDTA). An iron nitrosyl compound is formed. Developed by Chisso Engineering Company, Japan, and piloted in France and Japan. 

R. H. Bray and T. Kurtz Determination of total iron in soils by disodium dihydrogen ethylenediamine tetra-acetic titration. Analytic. Chem. 25, 347 (1953). 

Velickovic, Z., et ah, Adsorption of arsenate on iron(lll) oxide coated ethylenediamine functionalized multiwall carbon nanotubes. Chemical Engineering Journal, 2012.181-182(0) p. 174-181. 

Iron carbonyls form complexes with many donor molecules, such as pyridine, ammonia, ethylenediamine, and o-phenanthroline. In such complexes, carbonyl groups are partially replaced by the hgands. Some examples are ... 

Experimental observations indicate that the oxidation of cobalt (II) to cobalt (III) and the formation of ethylenediamine from N-hydroxyethylethylene-diamine occur simultaneously. This is quite the opposite to what is usually assumed in other instances of transition metal catalysis of organic reactions—for example, the catalytic effect of manganese in the oxidation of oxalic acid (7, 8), of iron in the oxidation of cysteine to cystine (22) and of thioglycolic acid to dithioglycolic acid (5, 23), of copper in the oxidation of pyrocatechol to quinone and in the oxidation of ascorbic acid (29, 30), and of cobalt in the oxidation of aldehydes and unsaturated hydrocarbons (4). In all these reactions the oxidation of the organic molecule occurs by the abstraction of an electron by the oxidized form of the metal ion. 

Interaction of Zn2+ and Cd2+ with the chelating agents ethylenedinitrilotetraacetic add and 1,2-irons-cyclohexylenedinitrilotetraacetic acid (H4L) (46a) shows evidence for the formation of dinuclear [M2L] spedes, in addition to mononuclear [ML]2- and [MHL]- ions.392 Evidence for similar dinuclear spedes is obtained from studies of other poly chelate agents such as diethylenetriaminepentaacetic acid (H5L),393 triethylenetetraaminehexaacetic acid (H6L)394 and ethylenediamine-iV,N -diacetic acid (H2L), 395 and the binuclear complex Zn2(edta)H20 has been characterized.396... 

One of the earliest references to a reaction in solution, which, as we now realize, depends upon the formation of a coordination compound, was recorded by Pliny who stated that the adulteration of copper sulfate by iron sulfate could be detected by testing with a strip of papyrus soaked in gall-nuts, when a black colour developed if iron were present. A. Libavius (1540-1616) noted how ammmonia present in water could be detected by the blue colour formed with a copper salt and A. Jacquelain (1846) actually determined copper salts in terms of the blue colour formed on adding ammonia. Later developments used coordination compounds formed from ethylenediamine and other polyamines.3 T. J. Herapath determined iron(III) as its red isothiocyanate complex in 1852 and the basic procedure is used today.3... 

Kinetics of oxidation of iron(II) by the surfactant complex ions d.v-chloro/bromo (dodecylamine)bis(ethylenediamine)cobalt(III) have been reported. The second-order rate constant remains constant below the critical micelle concentration (cmc), but increases with cobalt(III) concentration above the cmc. The rate of reaction was not affected by the added hydrogen ions. It is suggested that the reaction proceeds by an inner-sphere mechanism.74... 

Iron (III) chloride solution Nickel ethylenediamine nitrate [Ni(NH2(CH2)2NH2)3](N03)2... 

To a mixture of 100 ml of liquid ammonia and about 80 mg of black iron oxide was added 0.78 g (0.02 atom) of potassium. When all of the potassium had reacted, 3.3 g of N,N-dimethyl-N -(2-pyridyl)ethylenediamine was added. After the addition of 75 ml of dry toluene the ammonia was removed on the steam bath. To the cooled and stirred mixture was added 4.26 g of p-chlorobenzyl chloride, and the reaction mixture was stirred on the steam bath for 11 hours. It was then filtered and concentrated to an oil. This concentrate was taken up in ether, and the ethereal solution was washed with water, dried over sodium sulfate, and concentrated. Distillation gave 2.96 g of yellow liquid. Treatment of this distillate with an equivalent quantity of hydrogen chloride in absolute alcohol and precipitation by the addition of anhydrous ether gave 2.33 g of the N,N-dimethyl-N -(4-chlorobenzyl)-N -(2-pyridyl)ethylenediamine hydrochloride. 

For the preparation of tris(ethylenediamine)nickel(II) chloride 2-hydrate, 28 g. of 70% aqueous ethylenediamine is added to a solution of 23.8 g. (0.1 mol) of NiCl2 6H20 in 100 to 150 ml. of water. The purple solution is filtered to remove the small amount of hydrous iron oxide which precipitates and is then evaporated to a volume of 60 to 70 ml. on a steam bath. Two drops of ethylenediamine are added, and the solution is cooled in an ice bath. The orchid-colored crystals that form are collected by suction, washed twice with 95 % ethanol, and air-dried. The yield is 28.6 g. (80%). Several more grams may be recovered from the mother liquor by adding ethanol and cooling. Anal. Calcd. for [Ni(C2H8N2)3]Cl2-2H20 Ni, 16.97% Cl, 20.50%. Found Ni, 16.87% Cl, 20.48%. 

My co-worker J. Sedlmeier then held the view that the amine-containing iron carbonyl complexes were also ionic compounds (VII, 14, 21). Hence the compound Fe2(CO)4(en)3 (en= 1,2-ethylenediamine) was formulated as [Fe(en)3]2+[Fe(CO)4]2. Systematic investigations revealed that reactions of the iron carbonyls with other nitrogen and oxygen donors likewise involved valency disproportionation of the metal with concomitant formation of mono- and polynuclear carbonylferrates, viz., [Fe(CO)4]2, [Fe2(CO)8]2-, [Fe3(CO)n]2-. R. Werner (VII, 15, 17, 19, 20) even discovered and characterized compounds containing the tetranuclear anion [Fe4(CO)13]2, the first being that from pyridine and iron carbonyl, viz.,... 

Already in the early experiments involving treatment of iron tetracarbonyl with ethylenediamine hydrate, we observed that upon acidification of the solutions an extraordinarily intense repugnant smell was released (3). I can still clearly remember the day when I, together with my co-workers Leutert and Vetter, at the Heidelberg Institute, was able to freeze out a volatile water-clear liquid from the decomposition of the ethylenediamine-... 

There is a close relationship between the metabolism of the shoot and the root. It is generally accepted that the xylem forms the main path for upward movement of water and ions from the roots to the leaves. Most of the essential major elements are transported in the xylem as inorganic ions. Nitrogen may be transported along the xylem as N03 if it is present in the external solution as nitrate. However, the plant sap may also contain organic nitrogen compounds such as amino acids. In the xylem, heavy metals will usually only be transported if special chelates are formed, eg, by citrate (Streit and Stumm, 1993). Iron is taken up and transported more readily when supplied as a chelated complex, such as ferric ethylenediamine tetraacetate (FeEDTA) or as ferric diethylenetriamine pentaacetate (FeDTPA) (Wallace and North, 1953). Calcium may also be transported in a chelated form (Jacoby, 1966). 

Fe(en)3]Cl2 (en = ethylenediamine) The complex forms when, under anhydrous and anaerobic conditions, an excess of ethylenediamine is added to a solution of iron(II) chloride in ethanol. The product may be condensed with acetone, producing a tetraazacyclotetradecadiene macrocycle by way of a metal template reaction (88). [Fe(en)3]Cl3 is produced in a similar manner by reacting anhydrous iron(III) chloride with ethylenediamine (89). 

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