Question
What is the coordination number in $\left[ Ni ( en )_3\right] Cl _2$ ? Explain it.
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Answer
In $\left[ Ni ( en )_3\right] Cl _2$, the coordination number of $Ni ^{2+}$ is also 6. The ligand "en" represents ethane -1 , 2 - diamine $\left( H _2 N- CH _2- CH _2-\right.$ $NH _2$ ) and it contains two donor atoms (Nitrogen). Each ligand forms two coordination bonds with nickel. So, totally there are six coordination bonds between them.
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