Coordination Compounds - Result Question 49
####55. Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal $Ni(II)$. Which of the following statements is not true?
[2012 M]
(a) Red complex has a square planar geometry.
(b) Complex has symmetrical H-bonding
(c) Red complex has a tetrahedral geometry.
(d) Dimethylglyoxime functions as bidentate ligand.
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Solution:
- (c) Nickel ions are frequently detected by the formation of red precipitate of the complex of nickel dimethylglyoxime, when heated with dimethylglyoxime.
$ \begin{aligned} & CH_3-C=NOH \\ & CH_3-C=NOH \end{aligned}+Ni^{2+} \longrightarrow $
Dimethylglyoxime
Nickel dimethylglyoxime
$Ni^{2+}=\frac{\boxed{1 L}|1 / 1 / 1| 1 \mid 1}{3 d} \underset{4 s}{\square} \underset{4 p}{\square}$
$d m g$ is a strong field ligand, so electrons will rearrange as:
Thus, the complex is square plan ar geometry.
