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Specify the oxidation numbers of the metals in the following coordination entities: (i) \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}
Chemistry | Previous Year Question Papers
Specify the oxidation numbers of the metals in the following coordination entities: (i) \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}

Ans: Let us assume that the coordination number of Co is X.
Therefore, we can write:

    \[\begin{array}{l} x+0+(-1)+2(0)=+2 \\ x-1=+2 \\ x=+3 \end{array}\]

So, the coordination number of cobalt is +3.
(iii) Coordination number
A coordination number of central-metal atom is called the total number of ligands (whether neutral or negative ion) that are connected to the central-metal atom in the coordinating sphere. It is also known as its ligancy. For example, \mathrm{K}_{2}\left[\mathrm{PtCl}_{5}\right] contains platinum as the central metal ion and chloride ions as ligands. Since, there are 6 ligands, therefore the coordination number is 6
(iv) Coordination polyhedron
The coordination polyhedrons on the core atom may be described as the spatial arrangement of the ligands directly associated in the coordinating field to the central metal ion.
For example, square planar is a coordination polyhedron.
(v) Homoleptic complex
These are the complexes where the metal ion is linked to just one type of donor group. For example, \left[\mathrm{PtCl}_{6}\right]^{2} is a homoleptic complex.
(vi) Heteroleptic complex.
These are the complexes where the metal ion is linked to more than one type of donor group. For example, \left[\mathrm{Co}\left(\mathrm{NH}_{8}\right)_{4} \mathrm{Cl}_{2}\right]^{+}is a heteroleptic complex.

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