Green powder

It is a green powder, insoluble in water and in acids (cf. aluminium oxide, AI2O3). It is not reduced by hydrogen. [Pg.381]

Addition of an alkali metal hydroxide solution to an aqueous solution of a nickel(II) salt precipitates a finely-divided green powder. nickel(II) hydroxide NilOHfj on heating this gives the black oxide. NiO. which is also obtained by heating nickel(II) carbonate or the hydrated nitrate. Black nickel(II) sulphide, NiS, is obtained by passing hydrogen sulphide into a solution of a nickel(II) salt. [Pg.406]

Nickel Arsenate. Nickel arsenate [7784-48-7] Ni2(As0 2 8H20, is a yellowish green powder, density 4.98 g/cm. It is highly iasoluble ia water but is soluble ia acids, and decomposes on heating to form As20 and nickel oxide. Nickel arsenate is formed by the reaction of a water solution of arsenic anhydride and nickel carbonate. Nickel arsenate is a selective hydrogenation catalyst for iaedible fats and oils (59). [Pg.11]

Nickel acetate tetrahydrate [6018-89-9] Ni(C2H202) 4H2O, is a green powder which has an acetic acid odor, density 1.74 g/cm. When heated, it loses its water of crystallization and then decomposes to form nickel oxide. Nickel acetate is used as a catalyst intermediate, as an intermediate in the formation of other nickel compounds, as a dye mordant, as a sealer for anodized aluminum, and in nickel electroplating (59). [Pg.13]

The only oxide formed by any of these metals in the divalent state is CoO this is prepared as an olive-green powder by strongly heating the metal in air or steam, or alternatively by heating... [Pg.1117]

Palladium proved especially useful in the hydrogenation of 2-hydroxy-3-nitropropanoic acid. Reduction over palladium-on-carbon gave pure, powdery isoserine, whereas platinum failed to reduce the nitro function under neutral or acidic conditions reduction over Raney nickel gave a bright green powder (96). [Pg.105]

In a septum vial NH4Re04 (268 mg, 1.0 mmol) and 4-ter/-butylphthalom trile (7 921 mg, 5.0 mmol) were melted at 290 C and held at this temperature for 45 min. After cooling, the dark-blue mixture was crushed in a mortar. The product was first chromatographed on alumina (neutral, 10% H20) with toluene as eluent to remove large amounts of impurities, then with EtzO to remove excess phthalonitrile 7, and again twice with toluene. A blue-green powder was obtained yield 55 mg (6%). [Pg.755]

Diheptylnaphthalene-2.3-dicarbonitrile (748 mg, 2 mmol), Fe(OAc)2 (174 mg, 1 mmol), and DBU (1.5 mL) were heated in hexan-1-ol (25 mL) for 3 h under reflux. The mixture was poured into MeOH/H20 (1 1, 150 mL). The black-brown precipitate was filtered, extracted with MeOH, and dried. The residue was stirred in a mixture of t-BuNC (1 mL) and CHC13 (5 mL) for 24 h at 60 C. The solvent and the excess t-BuNC were removed in vacuo. The residue was purified by column chromatography (alumina, CHClj) and dried in vacuo at 80°C to give a green powder yield 280 mg (42%). [Pg.772]

Epoxy-5,6,7.8-tetrahydro-6,7-dimethylenenaphthalene-2,3-dicarbonitrile(0.50 g, 2.2 mmol), Ni(OAc)2 (0.14g, 1.1 mmol), and 7 drops of DBU, in pentan-l-ol (lOmL) were heated to 140 C for 16h under N2. The cooled solution was poured into MeOH (50mL) and the precipitate formed was centrifuged, dried, and put into a Soxhlct apparatus. After the product had been extracted for several days with MeOH, the dark-green powder was dried in vacuo at 100 C yield 0.19 g (36%). [Pg.773]

At rt, 2,3-NcFe (383 mg, 0.5 mmol) and 1,4-diisocyanobenzene (610 mg, 5 mmol) were stirred in MeOH (20 mL) for 12 h. The mixture was then filtered and the dark-green powder washed with MeOH and dried yield 442 mg (86%). [Pg.808]

Small portions of Li (0.01 g) were added to quinoxaline-2,3-dicarbonitrile (0.9 g, 5 mmol) in trichlorobenzene (5 mL) and BnOH (5 mL) at 160 C with agitation. The mixture was heated at 180 C for 1 h and cooled. The precipitate was filtered and washed with benzene, acetone, dil HCI, H20, and a second portion of acetone. After drying, a dark-green powder was obtained, yield 0.2 g (67%). [Pg.832]

Ferrous Picrate. [C6H2(N02)30] 2Fe, mw 513.15, N 16.38%, dark green powder which expld feebly at 315—20°. It was obtained by drying the octahydrate in a vac dessicator over sulfuric acid. Its impact sensitivity was 14-15" (vs 14" for TNT). The octahydrate was obtained by treating a hot coned aq soln of ferrous sulfate with Ba picrate yel hexagonal prisms which turned brown on standing impact sensitivity 36"... [Pg.757]

Green S (E 142, Cl Food Green 4, Brilliant Green BS) is a triarylmethane dye, with the chemical name sodinm N-[4-[[4-(dimethylamino)phenyl](2-hydroxy-3,6-disnlfo-l-naphthalenyl)-methylene]-2,5-cyclohexadien-l-ylidene]-N-methylmetha-naminium. The calcium and potassinm salts are also permitted. Green S is a dark bine or green powder or grannies, solnble in water, slightly solnble in ethanol, with a maximum absorption in water at 632 nm = 1720). It is not permitted as a... [Pg.611]

FIGURE 41 Bronze disease. Bronze disease, one of the most serious corrosive processes besetting recovered bronze antiquities, results from the interaction of one component of the patina on ancient bronze, namely, cuprous chloride with atmospheric oxygen, in a damp environment. Small spots of a light green powder (composed mainly of cuprous chloride) that grow rapidly on the surface of the patina are indicative that the bronze disease process is active. Unless the chemical activity of cuprous chloride is inhibited by some conservation procedure, bronze disease generally results in the eventual total destruction of bronze objects. [Pg.220]

Ultrasonic treatment of a mixture of elemental gallium and iodine in toluene yields a light green insoluble product described as gallium(I) iodide [36], However, it now seems to be dear, as a result of several experimental observations, that a mixture of subiodides of gallium is actually formed. Nevertheless, the green powder behaves like Gal in many reactions and has also been employed for the synthesis of tetrahedral tetragallium dusters [Eq. (2)] [37, 38]. [Pg.131]

The resulting black solid was fdtered, washed with acetone and dried at room tempera-mre in air to give Pd/A10(0H) as a dark ohve-green powder (2.75 g 0.86 wt% of Pd). [Pg.149]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...