1. The Reaction With Dmg Gives Ni(dmg)2 2+(aq)
2. The Reaction With Dmg Gives: Ni Dmg 2 2+ Aq

Dimethylglyoxime is a chemical compound described by the formula CH₃C(NOH)C(NOH)CH₃. Its abbreviation is dmgH₂ for neutral form, and dmgH for anionic form, where H stands for hydrogen. This colourless solid is the dioxime derivative of the diketone butane-2,3-dione (also known as diacetyl). DmgH₂ is used in the analysis of palladium or nickel. Its coordination complexes are of theoretical interest as models for enzymes and as catalysts. Many related ligands can be prepared from other diketones, e.g. benzil.

Preparation[edit]

E735: Complex Ions and Precipitates – Nickel(II) compounds Introduction Complexes and preipitates of nickel (II) are formed by adding ammonium hydroxide, ethylenediamine, and dimethylglyoxime to dilute solutions of Ni2+ in beakers.

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Dimethylglyoxime can be prepared from butanone first by reaction with ethyl nitrite to give biacetyl monoxime. The second oxime is installed using sodium hydroxylamine monosulfonate:^[1]

Write a balanced equation for each reaction. How many d electrons are there in Ni2+? For each complex ion formed, indicate the coordination number of the copper atom. If you carry out this reaction with 2.00g of NiCl2, what mass of NaDMG will you need for this reaction? What is the theoretical yield of Ni(DMG)2 you would expect from the experiment in part A? If the actual reaction only gives 1.22g of Ni(DMG)2 what is the percentage yield of the reaction? Balance the reaction of Ni(NO3)2 + DMG = Ni(DMG)2 + NO3 using this chemical equation balancer! Characteristic Reactions of Ni²⁺ Aqueous Ammonia; Sodium Hydroxide; Dimethylglyoxime; Sulfide; No Reaction; Most common oxidation state: +2; M.P. 2732º; Density 9.91 g/cm 3; Characteristics: Nickel is a silvery-gray metal. Not oxidized by air under ordinary conditions. Easily dissolved in dilute nitric acid. (c) Dimethylglyoxime, DMG, is a useful reagent for the quantitative estimation of nickel. It forms an insoluble salt with nickel ions according to the following equation. Ni2+(aq) + C 4H8N2O2 NiC4H6N2O2(s) + 2H +(aq) DMG Ni-DMG A small coin of mass 3.40 g was dissolved in nitric acid and an excess of DMG was added.

Complexes[edit]

Dimethylglyoxime is used to detect and quantify nickel, which forms the bright red complex nickel bis(dimethylglyoximate) (Ni(dmgH)₂). The reaction was discovered by L. A. Chugaev in 1905.^[2]

Cobalt complexes have also received much attention. In chloro(pyridine)cobaloxime^[3] the macrocycle [dmgH]₂²⁻ mimics the macrocyclic ligand found in vitamin B12.

References[edit]

1. ^Semon, W. L.; Damerell, V. R. (1930). 'Dimethylglyoxime'. Organic Syntheses. 10: 22. doi:10.15227/orgsyn.010.0022.CS1 maint: multiple names: authors list (link)
2. ^Lev Tschugaeff (1905). 'Über ein neues, empfindliches Reagens auf Nickel'. Berichte der Deutschen Chemischen Gesellschaft. 38 (3): 2520–2522. doi:10.1002/cber.19050380317.
3. ^Girolami, G. S.; Rauchfuss, T.B.; Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry: A Laboratory Manual (3rd ed.). pp. 213–215.

The Reaction With Dmg Gives Ni(dmg)2 2+(aq)

The Reaction With Dmg Gives: Ni Dmg 2 2+ Aq