Nioxime dioxime

Cyclohexane-l,2-dione dioxime (Nioxime) [492-99-9] M pK 11.92. Crystd from alcohol/water and dried in a vacuum at 40°. 

Cyclohexane-1,2-dione dioxime (nioxime) (IV) is more soluble in water (8.2 g L 1 at 21 °C) than is dimethylglyoxime it is an excellent reagent for the gravimetric determination of palladium. 

Current-voltage curve 594 Cyanide, D. of as silver cyanide, (g) 48l with silver nitrate, (ti) 358 titration with silver nitrate, 309, 358 Cyclohexane, D. of (ir) 756 Cyclohexane-1,2-dione dioxime see Nioxime... 

Cyclohexane-1,2-dione dioxime (nioxime) complexes of cobalt (II) and nickel (II) were concentrated from 10 ml seawater samples onto a hanging mercury drop electrode by controlled adsorption. Cobalt (II) and nickel (II) reduction currents were measured by differential pulse cathodic stripping voltammetry. Detection limits for cobalt and nickel were 6 pM and 0.45 mM, respectively. The results of detailed studies for optimising the analytical parameters, namely nioxime and buffer concentrations, pH, and adsorption potential are discussed. 

C6H10N2O2 Nioxime (1,2-Cyclohexanedione dioxime) Extraction-photometric Fe, Ni 3... 

Clathrochelate iron(II) complexes derived from alicyclic dioximes (nioxime, heptoxime, 4-methylnioxime, and octoxime) are of particular interest. The first clathrochelate FeNx3(BOH)2 and FeNx3(BF)2 compounds of this type, prepared by template cross-linking of three dioxime molecules on the Fe2+ ion with a boric acid in water and BF3-(C2H5)20 in re-butanol, respectively, were described in Ref. 40. The syntheses with alicyclic dioximes have been realized for a number of boron-containing cross-linking agents in many cases, in a quantitative yield, and in dilute solutions well [49, 54-61]. 

With the majority of alicyclic boron-capped iron(II) dioximates, neither template condensation nor recrystallization from organic solvents gave crystals suitable for X-ray analysis. A rate-controlled template condensation within several days yielded FeGx3(B0H)2 3H20 monocrystals, since the synthesis of this clathrochelate compound proceeds much more slowly than that of analogous complexes with nioxime and 4-methylnioxime [62, 63]. 

For the first time, a macrobicyclic ruthenium (II) tris-dioximate was obtained by refluxing of RuCl3-3H20 and nioxime in dry ethanol under argon with subsequent cooling to room temperature and treatment with phenylboronic acid [76]. 

The oxidation of iron(II) clathrochelates to iron(III) complexes is a quasi-reversible process with Eirz from 775 to 580 mV for clathrochelate dimethylglyoximates, from 850 to 570 mV for nioxime compounds, from 1 250 to 1 040 mV for glyoximates, and from 940 to 760 mV for a-benzyldioxime complexes. In the dioxime series Nx > Dm > Bd > Gm, the Eyz values becomes higher. 

CycIohexane-l,2-dione dioxime (Nioxime) [492-99-9] M 142.2, m 189-190 , pKj 10.68, pK 11.92. Crystallise Nioxime from alcohoFwater and dry it in a vacuum at 40 . Also 2.5g of oxime have been recrystaUised from 550mL of H2O using Fe free Norit. It forms complexes with Ni and Pd. [Hach et al. Org Synth 32 35 7952.] [Beilstein 7 IV 1982.]... 

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