Give the coordination number for each metal ion in the...

Give the coordination number for each metal ion in the following compounds: (a) $\left[\mathrm{Co}\left(\mathrm{CO}_{3}\right)_{3}\right]^{3-}$ (note that $\mathrm{CO}_{3}^{2-}$ is bidentate in this complex) (b) $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$ (c) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Br}_{2}\right]_{2}\left(\mathrm{SO}_{4}\right)_{3}$ (d) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{PtCl}_{4}\right]$ (e) $\left[\mathrm{Cr}(\mathrm{en})_{3}\right]\left(\mathrm{NO}_{3}\right)_{3}$ (f) $\left[\mathrm{Pd}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Br}_{2}\right]$ (square planar) (g) $\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{C})_{5}\right]$ (h) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$

Give the coordination number for each metal ion in the following compounds:
(a) $\left[\mathrm{Co}\left(\mathrm{CO}_{3}\right)_{3}\right]^{3-}$ (note that $\mathrm{CO}_{3}^{2-}$ is bidentate in this complex)
(b) $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
(c) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Br}_{2}\right]_{2}\left(\mathrm{SO}_{4}\right)_{3}$
(d) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{PtCl}_{4}\right]$
(e) $\left[\mathrm{Cr}(\mathrm{en})_{3}\right]\left(\mathrm{NO}_{3}\right)_{3}$
(f) $\left[\mathrm{Pd}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Br}_{2}\right]$ (square planar)
(g) $\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{C})_{5}\right]$
(h) $\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$

Key Concepts

Ligand Denticity

Ligand denticity refers to the number of donor atoms in a single ligand that can attach to a metal center. Monodentate ligands bind through one donor atom, while bidentate or polydentate ligands bind through two or more donor atoms. This concept is essential for accurately determining the coordination number of a complex and understanding chelation effects.

Coordination Number

This is the number of ligand donor atoms that are directly bonded to the central metal ion in a complex. It is determined by counting each individual point of attachment, regardless of whether the ligand is monodentate or polydentate. The coordination number influences the geometry, stability, and reactivity of the complex.

Molecular Geometry

The arrangement of ligands around a central metal ion in a coordination complex, dictated largely by its coordination number, results in various molecular shapes such as octahedral, tetrahedral, or square planar. Molecular geometry has important implications for the physical and chemical properties of the compound.

Transcript

00:02 All right.

00:03 So in this question, we want to find the coordination number for each metal iron in this metal complexes.

00:17 Now, these metal complexes or coordination complexes are formed as a result of the metal bonding to an atom, which denies the electrons.

00:32 All right.

00:34 So coordination number is the number of donor atoms bonded to the central metal ion.

00:44 So the atoms that bond to the metal that need the electrons.

00:50 Right.

00:51 So for the first one, a, we have this carbonate iron.

01:00 And we have been told that the carbonate is by.

01:04 Now, by identit means two atoms coordinate to the metal center.

01:11 All right? so if two items coordinate in the metal center and you have three of them, then the coordination number equals two times three, which is six.

01:27 So the coordination number of the central metal iron, cobalt, is six.

01:34 Now for b, we have four of these ammonia ligands, cardination to the copper.

01:44 So the coordination number is four, right? then c, the metal complex is this one.

01:58 Now, this sulfate is just a counter -ion, right? so we are considering only this complex.

02:05 We have four of ammonia ligands.

02:08 And two of bromine.

02:10 So we have six.

02:13 So the cognition number of the metal equals six.

02:22 The coordination number is six.

02:27 Then the next one, we have two complexes here.

02:31 We have this and that...