Indicate the coordination number for the central metal atom...

Indicate the coordination number for the central metal atom in each of the following coordination compounds: (a) $\left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2} \mathrm{Br}_{2}\right]$ (b) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)(\mathrm{py})(\mathrm{Cl})(\mathrm{Br})\right]\left(\mathrm{By}=\text { pyridine, } \mathrm{C}_{5} \mathrm{H}_{5} \mathrm{N}\right)$ (c) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ (d) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)(\mathrm{py})(\mathrm{Cl})(\mathrm{Br})\right]$ (e) $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right]$ (f) $\left[\mathrm{Fe}(\mathrm{en})_{2}(\mathrm{CN})_{2}\right]^{+}$(en $=$ ethylenediamine, $\mathrm{C}_{2} \mathrm{H}_{8} \mathrm{N}_{2} )$

Indicate the coordination number for the central metal atom in each of the following coordination compounds:
(a) $\left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2} \mathrm{Br}_{2}\right]$
(b) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)(\mathrm{py})(\mathrm{Cl})(\mathrm{Br})\right]\left(\mathrm{By}=\text { pyridine, } \mathrm{C}_{5} \mathrm{H}_{5} \mathrm{N}\right)$
(c) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$
(d) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)(\mathrm{py})(\mathrm{Cl})(\mathrm{Br})\right]$
(e) $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right]$
(f) $\left[\mathrm{Fe}(\mathrm{en})_{2}(\mathrm{CN})_{2}\right]^{+}$(en $=$ ethylenediamine, $\mathrm{C}_{2} \mathrm{H}_{8} \mathrm{N}_{2} )$

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Key Concepts

Coordination Number

The coordination number is the total count of donor atoms (from one or more ligands) directly bonded to the central metal atom in a coordination compound. It is determined by summing the number of individual binding sites contributed by each ligand, irrespective of whether the ligands are monodentate or polydentate.

Ligands and Denticity

Ligands are atoms, ions, or molecules that donate electron pairs to a central metal atom to form a coordination complex. Denticity refers to the number of donor atoms in a ligand that bind to the metal; for example, monodentate ligands bind through a single donor atom while bidentate or polydentate ligands bind through two or more donor atoms.

Coordination Geometry

The coordination geometry describes the spatial arrangement of the ligands around the central metal atom, and it is closely related to the coordination number. Common geometries include tetrahedral and square planar for coordination numbers of four, while an octahedral arrangement is typical for a coordination number of six.

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