Nitrites, inorganic, aqueous solution

Nickel Catalyst, dry Nickel Cyanide Nickel Nitrate Nickel Nitrite Nicotine Nicotine Compound, liquid, n.o.s. 2881 1653 2725 2726 1654 3144 1655 37 53 35 35 55 55 Nitriles, toxic, n.o.s. (solid) Nitrites, inorganic, aqueous solutions, n.o.s. Nitrites, inorganic, n.o.s. Nitroanilines Nitroanisole 3276 3219 2627 1661 2730 55 35 35 55 55... 

NITRITES, inorganic, aqueous solutions. 3246 59 METHANESULPONYL CHLORIDE... 

The stability of 1 1 cobalt complex dyestuffs of this type varies considerably according to the nature of the metallizable system in the azo compound. For example, neutral aqueous solutions of 1 1 cobalt complexes of o-hydroxyarylazopyrazolones are stable almost indefinitely at 60 °C. Under similar conditions, 1 1 cobalt complexes of o.o -dihydroxydiarylazo compounds slowly decompose with loss of ammonia to give the symmetrical 2 1 cobalt(III) complex of the azo compound. The corresponding complexes of u-carboxy-o -hydroxydiarylazo compounds decompose rather more rapidly at 60 °C, and those of o-carboxyarylazopyrazolones are unstable in aqueous solution at room temperature in the absence of excess ammonia. None is sufficiently stable to be of value as a dyestuff in its own right but the isolation of complexes of this type opened the way to the production51 of pure, unsymmetrical 2 1 cobalt(III) complex dyestuffs for the first time (e.g. 42). 1 1 Cobalt complex dyestuffs have also been prepared by the interaction of tridentate metallizable azo compounds and cobalt(II) salts in the presence of inorganic nitrites. These too are reported52 to react with an equimolar quantity of a different tridentate metallizable azo compound to yield a pure unsymmetrical 2 1 cobalt(III) complex. 

Fig. 19.5. Infrared absorption of common inorganic ions in aqueous solution. The molar absorptivity ( ) = absorbance/fmolarity x path length, in cm). A shoulder is indicated by sh. Notes (1) Bands due to solvated SOj are also usually present. (2) SO " is readily oxidized in aqueous solution to SO ". Absorption at 1105 cm is due to both v, of SOf" and vj of SOj". (3) Sulfur is precipitated at pH < 5. (4) Bands for more acidic forms are not included. Hydrolyzed to orthophosphate by boiling at low pH. (5) Concentrated solutions show band broadening, together with the appearance of a very weak band at 1045 cm" .(6)The 1330 cm band appears as a shoulder on the side of the 1230 cm" band. Nitrites decompose at pH < 5. (7) Concentrated solutions show a very weak band at 1060cm". (8) An additional band observed near 1700 cm" not included in this figure. (Goulden and Manning, 1967.)...

The inorganic nitrite used as a corrosion inhibitor in aqueous alkylene glycol or polyoxyalkylene glycol solutions can be replaced with polyoxyalkylene amines [1263,1264]. Such polyoxyalkylene amines impart corrosion inhibition to the liquid in contact with the metal and the metal in contact with the vapors of the aqueous composition. Aqueous compositions containing the glycol and the polyoxyalkylene amine also exhibit a low foaming tendency. 

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