Brown and green products

EXPERIMENT 3.1 SYNTHESIS OF A/,A/ -DISALICYLALDEHYDE-1,3-PROPANEDIIMINENICKEL(ll), [Ni(salpd)] AND ISOLATION OF THE BROWN AND GREEN PRODUCTS... 

After 24 h the product solution will consist of two phases, a top murky brown phase, and a thick, light-green phase on the bottom. Vacuum filter and evaporate under reduced pressure to produce a green mixture of product containing both brown and green products. 

To calculate the molecular masses of the brown and green products, complete Question 3.1. 

Determination of the Magnetic Moments of the Brown and Green Products of N,N -disaiicyiaidehyde-1,3-propanediiminenickel II)... 

Uses.—Uranium compounds are produced as by-products in the extraction of radium, and are consequently available in considerable quantity. They are not, however, as yet employed in industry to any great extent. Sodium uranate, or uranium yellow, is used to a limited extent for colouring glass, to which it imparts a yellow opalescence, and in the ceramic industries, as also is the oxide UjOg in the preparation of yellow, brown, and green glazes. - Certain salts are employed... 

Prepare samples of your /V./V -ligand, and both brown and green nickel(II)salpd products for IR analysis by grinding to a fine powder a mixture of compound ( 2 mg) and dry, IR-quality KBr (100 mg) and pressing into a thin, clear, pellet. 

Direct Violets, Greens, Browns, and Blacks. Direct violets and greens are small volume products, with combiaed production of nearly 100 tin 1988. 

Red, brown and black iron oxides are prepared by first heating green iron(II) sulphate crystals to remove six of the molecules of water of crystallisation (leaving FeS04.H20) and then calcining the product to the desired form of iron(III) oxide with the evolution of sulphur oxides. 

Thienothiophenes undergo the indophenine reaction with isatin (see Section III,I). Oster reported that thieno[2,3-6]thiophene (1) gave a green product with a ratio of isatin to thienothiophene 1 1, and a blue substance with the ratio of the initial substances 2 1. Steinkopf and HempeP could not obtain this blue substance instead they isolated a brown material with the isatin to thienothiophene 1 ratio 2 3 at +50° they isolated a substance with the ratio 1 1 and at +70°, with ratio 1 2. Steinkopf and PetersdorP found that a reaction of 2-acetylthieno[2,3-6]thiophene with isatin produces 2- or 3-(2-thieno[2,3-6]thienyl) cinchoninic acid. The acid was decarboxylated to 2- or 3 2-thieno[2,3-6]thienyl)quinoline (the site of quinoline group in thienothiophene 1 molecule was not established). 

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