Objective To learn about Precipitative Gravimetric Analysis. To precipitate Ni(DMG) 2 complex using NiCl 2 6H 2 O and Dimethyl glyoxime (DMG) and to filter it using sintered glass crucible and hence find the yield. To find the amount of Nickel (Ni) present in the given salt. (1) In both the compounds, Ni exists as Ni 2 +, bt dmg is a stronger field ligand than en annd therefore, CFSE of Ni (dmg) 2 will be greater than Ni (en) 2 2 +. (2) Co exists as Co 3 + in both the compounds. Variance, use the following procedure: 1. Fill each crucible containing the Ni(DMG) 2 precipitate half full with ethanol and let sit for 15 min before applying suction. Apply such to remove ethanol. Dry the crucible and contents, cool and reweigh. If the crucible has lost weight but the results appear inconsistent, repeat the procedure.

(Redirected from Ni(dmgH)2)

Nickel bis(dimethylglyoximate)
Names
IUPAC name nickel;N-[(Z)-3-nitrosobut-2-en-2-yl]hydroxylamine
Other names
Identifiers
3D model (JSmol)
ChemSpider
EC Number
PubChemCID
UNII	7CZ5340YUM
InChI=1S/2C4H8N2O2.Ni/c21-3(5-7)4(2)6-8;/h25,7H,1-2H3;/b2*4-3-;
CC(=C(C)N=O)NO.CC(=C(C)N=O)NO.[Ni]
Properties
C₈H₁₄N₄NiO₄
Molar mass	288.917 g·mol⁻¹
Appearance	red solid
Density	1.698 g/cm³
Hazards
GHS pictograms
GHS Signal word	Warning
H315, H317, H319, H335, H351
P201, P202, P261, P264, P271, P272, P280, P281, P302+352, P304+340, P305+351+338, P308+313, P312, P321, P332+313, P333+313, P337+313, P362, P363, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Nickel bis(dimethylglyoximate) is the coordination complex with the formula Ni[ONC(CH₃)C(CH₃)NOH]₂. The compound is a bright red solid. It achieved prominence for its use in the qualitative analysis of nickel.^[1]

Structure[edit]

Nickel(II) is square planar.^[2] It is surrounded by two equivalents of the conjugate base (dmgH⁻) of dimethylglyoxime (dmgH₂). The pair of organic ligands are joined through hydrogen bonds to give a macrocyclic ligand. The complex is distinctively colored and insoluble leading to its use as a chelating agent in the gravimetric analysis of nickel.

Ni(dmg)2 Preparation

The use of dimethylglyoxime as a reagent to detect nickel was reported by L. A. Chugaev in 1905.^[3]

Ni Dmg 2

References[edit]

Ni(dmg)2 Pdf

^Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN978-0-08-037941-8.
^Donald E. Williams, Gabriele Wohlauer, R. E. Rundle (1959). 'Crystal Structures of Nickel and Palladium Dimethylglyoximes'. J. Am. Chem. Soc. 81: 755–756. doi:10.1021/ja01512a066.CS1 maint: uses authors parameter (link)
^Tschugaeff, Lev (1905). 'Über ein neues, empfindliches Reagens auf Nickel' [About a new, sensitive reagent on nickel] (PDF). Berichte der deutschen chemischen Gesellschaft (in German). 38 (3): 2520–2522. doi:10.1002/cber.19050380317.

Ni Dmg 2 Hybridization

Retrieved from 'https://en.wikipedia.org/w/index.php?title=Nickel_bis(dimethylglyoximate)&oldid=961475691'