Nitrilotriacetate complexes

Firestone MK, JM Tiedje (1975) Biodegradation of metal-nitrilotriacetate complexes by a Pseudomonas species mechanism of reaction. Appl Microbiol 29 758-764. 

Fig. 21. Volume profile for the reaction of methyl radicals with the nitrilotriacetate complex of Co(II).

Reactants HPS = tri(n-butyl)phosphine selenide BPT = tri(n-butyl)phosphine teluride NTA = nitrilotriacetate complex ion SeCN = sellenocy-anide SOS = selenosulfite STS = sodium thiosulfate TeCN = tellurocyanide TEMS = trifluoromethane sulfanate TSS = triphenylstibine sulfide. 

The ease with which the core of ferritin and bacfer can be reconstituted with Fe and an oxidant has led to work with Fe and other metals. Fe, added as a citrate, oxalate, or nitrilotriacetate complex, to horse holoferritin does enter the core, but only a small amount of Fe is taken up (139). No Fe + was taken up by apoferritin. This work emphasizes the requirement for core formation to occur by the oxidation of Fe +, a subject we discuss in the following section. 

Zr and Hf nitrilotriacetate complexes have been prepared via addition of the neutral ligand to mixtures of M0C12(H20)8 (M = Zr, Hf) and various alkali carbonates.562 A series of these salts have been characterized crystallographically.563-576 Typical of these structures was the species [Me2NH2]2[Zr N(CH2C02)3 2], in which the Zr center was coordinated to six O atoms of the two... 

BAN/KAD] Banerjea, D., Kaden, T. A., Sigel, H., Enhanced stability of ternary complexes in solution through the participation of heteroaromatic N bases. Comparison of the coordination tendency of p3n"idine, imidazole, ammonia, acetate, and hydrogen phosphate toward metal ion nitrilotriacetate complexes, Inorg. Chem., 20, (1981), 2586-2590. Cited on page 330. 

Trott, T., Henwood, R.W. and Langford, C.H., 1972. Sunlight photochemistry of ferric nitrilotriacetate complexes. Environ. Sci. Technol., 6 367—368. 

Ebina Y, Okada S, Hamazaki S, Ogino F, Li FJ, Midorikawa O (1986) Nephrotoxicity and renal cell carcinoma after use of iron- and aluminum-nitrilotriacetate complexes in rats. JNCI 76 107-113 Floyd RA (1990) The role of 8-hydroxyguanine in carcinogenesis. Carcinogenesis 11 1447-1450... 

The mechanism of 1 1 complex formation between palladium(II) and catechol and 4-methylcatechol has been studied in acidic media, and the rate of 1 1 (and 1 2) complex formation between silver(II) and several diols is an order of magnitude higher in basic solution than in acidic. The kinetics of formation and dissociation of the complex between cop-per(II) and cryptand (2,2,1) in aqueous DMSO have been measured and the dissociation rate constant, in particular, found to be strongly dependent upon water concentration. The kinetics of the formation of the zinc(II) and mercury(II) complexes of 2-methyl-2-(2-pyridyl)thiazolidine have been measured, as they have for the metal exchange reaction between Cu " and the nitrilotriacetate complexes of cobalt(II) and lead(II). Two pathways are observed for ligand transfer between Ni(II), Cu(II), Zn(II), Cd(II), Pb(II) and Hg(II) and their dithiocarbamate complexes in DMSO the first involves dissociation of the ligand from the complex followed by substitution at the metal ion, while the second involves direct electrophilic attack by the metal ion on the dithiocarbamate complex. As expected, the relative importance of the pathways depends on the stability of the complex and the lability and electrophilic character of the metal ion. 

Therapeutic Function Lupus Erythematosus Suppressant Chemical Name Nitrilotriacetic acid bismuth complex sodium salt Common Name —... 

Fig. 15-3 Mixed ligand and multi-dentate complexes (a) a hypothetical Me(OH)Cl° complex (b) nitrilotriacetate chelate of a divalent metal ion in a tetrahedral configuration.

Alkaline aqueous media containing selenosulfate ions (SeS03 ) and complexes of Cd with EDTA or nitrilotriacetate (NTA) have been successfully utilized to accomplish cathodic electrodeposition of nearly stoichiometric, wurtzite CdSe [62-64]. Similar results have been reported for seleno-cyanate (SeCN ) alkaline baths... 

Considerable effort has been directed to the degradation of complexing agents. The degradation of nitrilotriacetate (NTA), ethylenediamine tetraacetate (EDTA), and related compounds display some important featnres ... 

Iron can be controlled with certain complexing agents, in particular glucono-5-lactone, citric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylethylene diaminetriacetic acid, hydroxyethyliminodiacetic acid, and the salts from the aforementioned compounds. These compounds must be added together with nitrogen-containing compounds such as hydroxylamine salts or hydrazine salts [486,643,1815]. 

Figure 17-26. Complexing agents for iron control glucono-6-lactone, nitrilotriacetic acid, hydroxyethylene diaminetetraacetic acid, and ethylenediaminetetraacetic acid.

According to R. Brdicka and K. Vesely the carbonyl form of formaldehyde is reduced and the limiting kinetic current is given by the rate of the chemical volume reaction of dehydration. An analogous situation occurs for the equilibria among complexes, metal ions and complexing agents if the rates of complex formation and decomposition are insufficient to preserve the equilibrium. A simple example is the deposition of cadmium at a mercury electrode from its complex with nitrilotriacetic COO"... 

White, V. and Knowles, C., Effect of metal complexation on the bioavailability of nitrilotriacetic acid to Chelatobacter heintzii ATCC 29600, Arch Microbiol, 173 (5), 373-382, 2000. 

Complexes of IrIV with iminodiacetic acid (HN(CH2COOH)2), nitrilotriacetic acid (N(CH2COOH)3), and trara,s-l,2-cyclohexanediaminetetraacetic acid (L) have been studied by spectroscopic methods.43... 

Kamoto and collaborators [150] designed and synthesized a new tum-on fluorescent probe 54, which is excitable by visible light (kex 490 nm), based on a fluorescein derivative 55. It is composed of a metal-nitrilotriacetic (NTA) complex as the hexahistidine tag recognition site, fluorescein as the fluorophore, and a linker. 

An ionophoretic method was described by Tewari [41] for the study of equilibria in a mixed ligand complex system in solution. This method is based on the movement of a spot of metal ion in an electric field with the complexants added in the background electrolyte at pH 8.5. The concentration of the primary ligand (nitrilo-triacetate) was kept constant, while that of the secondary ligand (penicillamine) was varied. The stability constants of the metal nitrilotriacetate-penicillamine complexes have been found to be 6.26 0.09 and 6.68 0.13 (log K values) for the Al(III) and Th(IV) complexes, respectively, at 35 °C and an ionic strength of 0.1 M. 

The bis(nitrilotriacetato)zirconium(IV) ion, first detected by Intorre and Martell,1 has been obtained as a hydrated potassium salt by evaporation of a solution containing zirconium oxychloride and the potassium salt of nitrilotriacetic acid. On vacuum dehydration, the anhydrous complex is formed. 

One way in which cobalt dispersion can be increased is the addition of an organic compound to the cobalt nitrate prior to calcination. Previous work in this area is summarized in Table 1.1. The data are complex, but there are a number of factors that affect the nature of the catalyst prepared. One of these is the cobalt loading. Preparation of catalysts containing low levels of cobalt tends to lead to high concentrations of cobalt-support compounds. For example, Mochizuki et al. [37] used x-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR) to identify cobalt silicate-like species in their 5% Co/Si02 catalysts modified with nitrilotriacetic acid (NTA). The nature of the support also has... 

The category of builders consists predominantly of several types of materials -specific precipitating alkaline materials such as sodium carbonate and sodium silicate complexing agents like sodium triphosphate or nitrilotriacetic acid (NTA) and ion exchangers, such as water-soluble polycarboxylic acids and zeolites (e.g., zeolite A). 

---