Nitrilotriacetate, NTA

LAS linear alkylbenzolsulfonate, EDTA ethylenediamine-tetraacetic-acid, NTA nitrilotriacetate, D5 decamethylcyclopentasiloxane... 

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. 

These columns are used for purification of recombinant fusion proteins tagged to 6XHis. The commercial columns contain the precharged Ni coupled to a tetradentate chelating absorbent such as the NTA (nitrilotriacetic acid), bound to a matrix which could be Sepharose or Cellulose. 

Me2bsb = bidentate Schiff base (73) with Ri mini = methylglyoxalbismethyleneimine, MeN= nta = nitrilotriacetate oep = octaethylporphyrin phen= 1,10-phenanthroline, (71) pic = 2-picolylamine = 2-(methylamino)pyridine Py = pyridine pz = pyrazine... 

This effect is shown in Eigure 2.9 for CdSe films deposited from baths containing Cd complexed with NTA (nitrilotriacetate) and Na2SeS03 as a Se source. The nanocrystal size, measured by both XRD and TEM, varied from ca. 3 nm up to 20 nm with increase in temperature and/or change in mechanism from a cluster mechanism to an ion-by-ion deposition. The optical bandgap shifts from 1.8 eV (for bulk, zincblende CdSe) to ca. 2.4 eV for the smallest nanocrystals (ca. 3 nm). 

NTA = nitrilotriacetic acid, HEDTA = hydroxy-2-ethytenediaminetriacetic acid, CyDTA = trans-1,2-diaminocyclohexane-jV, A1, N, jV -tetraacetic acid, DTPA - diethylenetriaminepentaacetic add, EGTA = ethyleneglycolbis(2-aminoethyl)-Ar,Ar -tetraacetic add, EDTA = ethylenediaminetetraacetic acid, TTHA = triethylenetetraminetetraacetic add, PIDA = jV-(2-pyridylmethyl)iminodiacetic add, CyDA = cydohexyiiminodiacetic add. 

Abbreviations DHG = Ar,Ar-di(2-hydroxyethyl)glycine NTA = nitrilotriacetic acid EDTA = ethylenediaminetetraacetic acid tiron = pyrocatechol-3,5-disulfonic acid BAL = 2,3-dimercaptopropanol unithiol = sodium 2,3-dimercaptopropane sulfonate tren — triaminatriethylamine penten = tetrakis(aminoethyl)ethylenediamine bipy = 2,2 -bipyridyl phen = 1,10-phenanthroline. 

The most common chelants include EDTA (ethylenediaminetetraacetic acid) and its salts, NTA (nitrilotriacetic acid) and its salts, gluconic acid, sodium gluconate, sodium glucoheptonate (sodium heptonate), as well as the various phosphonates, polyphosphates, lignin sulfonates, and citric acid. 

EDTA, ethylenediamine tetraacetic acid NTA, nitrilotriacetic acid HEEDTA, hydroxy-ethylethylene EDTA DTPA, diethylenetriamine pentaacetic acid EDDDA, ethylene diamine-/V,/V -diacetic-/V,/V -dipropionic acid EDDA, /V,/V -ethylene diamine diacetic acid CyDTA, cyclohexylene diamine tetraacetic acid. 

NTA nitrilotriacetate, EDTA = ethylenediaminetetraacetate, and Chelex 100 a crosslinked polystyrene divinylbenzene porous lattice with attached iminodiacetate multidentate functional groups. 

SYNS HAMPSHIRE NTA NITRILOTRIACETIC ACID, TRISODIUM SALT NTA TRISODIUM NITRILOTRIACETATE TRISODIUM NITRILOTRIACETIC ACID... 

NTA = nitrilotriacetate. The rate expression takes the form, rate = fcoH[Cu(EGDA)][OH ] with koH = 2.18x at 25 The kinetic measurements do not differentiate between... 

The reaction of [OH] with [Mn(EDTA)] (EDTA = ethylenediaminetetra-acetate) and [Mn(NTA)] (NTA = nitrilotriacetate) involves hydrogen abstraction from the ligands and not oxidation of the metal center the unstable Mn(II)-ligand radical intermediates decay via complex first- and second-order kinetics that are pH dependent and involve hydrolysis and disproportionation. The Mn(II) complexes are oxidized by [Brj], [(NCS) and Of, possibly via an inner-sphere mechanism. 

The reaction of (Co(EDTA)p (EDTA= ethylenediaminetetraacetate) with [OH] proceeds via parallel oxidation of the metal center and abstraction of hydrogen from the ligand the reaction of [Co(NTA)] (NTA = nitrilotriacetate) with [OH]" proceeds via abstration only. Oxidation of these complexes by Brj, [(NCS) ], O and alkylperoxy radicals occurs via an inner-sphere mechanism, possibly involving seven-coordinated intermediates . 

The [Ni(EDTA)] (EDTA = ethylenediaminetetraacetate) and [Ni(NTA)] ions (NTA = nitrilotriacetate) react with [OH] and other oxidizing radicals to yield transient absorptions arising from the corresponding Ni(IlI) species ". Experiments with [Ni(NTA)] indicate that the reaction with [OH] forms a coordinated ligand-radical species from hydrogen abstraction, which reacts" with [Ni(NTA)] , [IrClJ ... 

---