Dimethyl glyoxime

Dimethyl glyoxime Dimethyl terephthalate Diphenylamlne Edetic acid Ethyl ether Hydrobromic acid Hydroxylamine Lead molybdate Manganese oxide (ous) Palladium chloride (ous)... 

The reactions of aqueous solutions of nickel(II) salts with hydroxide ions, with excess ammonia, with sulphide ion and with dimethyl-glyoxime (see above) all provide useful tests for nickel(II) ions. 

Discussion. When dimethyl glyoxime is added to an alkaline solution of a nickel salt which has been treated with an oxidising agent (such as bromine), a red... 

Much of the recent literature relates to BfVbridged Co" cobaloximes based on dimethyl (89) or diphenyl glyoxime (104).110 The BfVbridged cobaloximes (e.g. 89) show greater stability to hydrolysis than analogous H-bridged species (e.g. 88). The diphenylglyoxime complexes (104) show enhanced air and hydrolytic stability... 

In the study of effects of ultrasound on the aqueous reactions of nickel, we found some interesting results, for example, the colloidal formation of Ni-DMG complex and degassing of NH3 during different experiments. When 25 ml of 0.001 M NiSC>4 solution was complexed with 5 ml of 1% dimethyl glyoxime (DMG) in faintly alkaline ammonia medium and sonicated for 30 minutes and compared with another set of 25 ml of complexed solution which was stirred mechanically, a colloidal solution of Ni-DMG complex was formed in sonicated condition. Particles of Ni-DMG complex did not settle even after keeping 3 1 h because of their smaller size, in sonicated solution, whereas in the unsonicated condition large particles of Ni-DMG complex settled down immediately. 

Perez-Pina et al. [805] studied the use of triethanolamine and dimethyl-glyoxime complexing agents in absorptive cathodic stripping voltammetry of cobalt and nickel in seawater. Nickel and cobalt could be determined at levels down to 2 nM and 50 pM, respectively. 

Nickel Nickel dimethyl glyoxime complex extracted from water AAS 5 (ig/1 [899]... 

Another class of gluten substitute is the modified celluloses dimethyl-glyoxime cellulose and hydroxyl propyl methyl cellulose 1.6% of... 

Materials Required Ammonium nickel sulphate (pine) 0.135 g citric acid 5.0 g dilute ammonia solution dimethylglyoxime solution (dissolve 0.50 g of dimethyl-glyoxime in 250 ml of ammonia solution and diluting to 500 ml with water) 20 ml chloroform 50 ml ... 

Nickel may he measured quantitatively hy several microanalytical gravimetric methods that include (l)formation of a red precipitate with dimethyl-glyoxime, (2) precipitation as a hlack sulfide with ammonium sulfide, (3) precipitating as a complex cyanide hy treating with alkali cyanide and bromine, and (4) precipitation as a yellow complex hy treating an ammoniacal solution of nickel with dicyandiamide sulfate (Grossman s reagent), followed hy the addition of potassium hydroxide. All of these methods can separate nickel from cobalt in solution. 

To be consistent, the same conclusion should be drawn for the dimethyl-oxime complexes. The difficulty here is to answer the question as to why other flat, uncharged, molecules do not stack in a similar fashion. It is believed that in fact they would do so were it not for factors such as mutual repulsion of u-electrons, as in condensed hydrocarbons (214). An examination of the bond lengths shown in Fig. 10 indicates that in the dimethyl-glyoxime complexes the ir-bonding is not nearly so extensive as commonly imagined. Similarly, it is known that aromatic donor-acceptor complexes, e.g, quinhydrone, stack in a fashion very similar to the dimethylglyoximc complexes (166a), and also show abnormal dichroism (182). 

Materials. Imidazole, benzimidazole, and glucosamine hydrochloride were obtained from the Eastman Kodak Co., and used without further purification, after drying for several days over anhydrous calcium chloride. Stock solutions of nickel nitrate and nickel chloride were analyzed by precipitation with dimethyl-glyoxime. Stock solutions of cadmium nitrate were analyzed gravimetrically by conversion to cadmium sulfate. 

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