The Reaction With Dmg Gives: [ni(dmg)2]2+(aq)
(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.
-ion.jpg "Dmg")
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| ECHA InfoCard | 100.002.201 |
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| Properties | |
| C4H8N2O2 | |
| Molar mass | 116.120 g·mol−1 |
| Appearance | White/Off White Powder |
| Density | 1.37 g/cm3 |
| Melting point | 240 to 241 °C (464 to 466 °F; 513 to 514 K) |
| Boiling point | decomposes |
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| Hazards | |
| Main hazards | Toxic, Skin/Eye Irritant |
| Safety data sheet | External MSDS |
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| GHS Signal word | Danger |
| H228, H301 | |
| P210, P240, P241, P264, P270, P280, P301+310, P321, P330, P370+378, P405, P501 | |
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| Hydroxylamine salicylaldoxime | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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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.
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Preparation[edit]
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]
Nickel salts and their solutions will irritate the eyes upon contact. Dust from solid nickel salts in harmful, and the compounds are assumed to be poisonous if ingested. Pour the waste into the waste bottle. If there is not a date on the waste bottle fill out the date. Return the materials to the cart in the demonstration library room. Balance the reaction of Ni(NH3)6 + DMG = Ni(DMG)2 + (NH3)2 using this chemical equation balancer! Addition of an alcoholic solution of dimethylglyoxime to an ammoniacal solution of Ni(II) gives a rose-red precipitate, abbreviated Ni(dmg) 2: Ni(NH 3) 6 2+ (aq) + 2(CH 3 CNOH) 2 (alc) NiONC(CH 3)C(CH 3)NOH 2 (s) + 2NH 4 + (aq) + 4NH 3 (aq) Sulfide: Black NiS is precipitated by basic solutions containing sulfide ion: Ni 2+ (aq) + S 2.
Answer to NICKEL (II) The reaction with DMG gives: Ni(DMG)22+(aq) The reaction with HCl gives: NiCl64-(aq) The reaction with e. Dmg supplement benefits. Nickel ion and chloride ion reaction. Ni 2+ (aq) ions reacts with concentrated Cl-ions in the presence of ethanol medium to give tetrachloronickel(II) ion / NiCl 4 2-, a blue colour solution. Ni 2+ (aq) ions reacts with concentrated Cl-ions in the presence of acids to give tetrachloronickel(II) ion / NiCl 4 2-, a yellow brown solution.
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]
- ^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)
- ^Lev Tschugaeff (1905). 'Über ein neues, empfindliches Reagens auf Nickel'. Berichte der Deutschen Chemischen Gesellschaft. 38 (3): 2520–2522. doi:10.1002/cber.19050380317.
- ^Girolami, G. S.; Rauchfuss, T.B.; Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry: A Laboratory Manual (3rd ed.). pp. 213–215.