L'ion Ag^+, en présence d'ammoniac NH3, donne un complexe de formule [Ag(NH3)2]^+. Comment les d

step 1 Okay, we have ligand ammonia. We have central metal, which is silver. And silver has the oxidati

L'ion Ag^+, en présence d'ammoniac NH3, donne un complexe de...

L'ion $\mathrm{Ag}^{+}$, en présence d'ammoniac $\mathrm{NH}_3$, donne un complexe de formule $\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}$. Comment les deux liaisons $\mathrm{Ag}-\mathrm{NH}_3$ se forment-elles? Quelles sont les charges présentes dans ce complexe?

Key Concepts

Charge Distribution in Coordination Complexes

The overall charge of a coordination complex is determined by the sum of the charges on the central metal ion and the ligands. When neutral ligands like ammonia coordinate to a metal ion, the charge of the complex remains the same as that of the metal ion, illustrating the concept of charge conservation in complex formation.

Coordination Complex

A coordination complex is formed when a central metal ion binds to surrounding molecules or ions called ligands through coordinate covalent bonds. These complexes involve interactions where the metal acts as an electron acceptor (Lewis acid) and the ligands donate electron pairs (Lewis bases).

Dative (Coordinate) Covalent Bond

A dative covalent bond is a type of bond in which both electrons in the bonding pair come from the same atom, typically from a ligand that donates its lone pair to form a bond with an electron-deficient metal ion. This type of bonding is essential in the formation of metal-ligand complexes.

Ligands

Ligands are atoms, ions, or molecules that can donate a pair of electrons to a metal ion to form a coordination bond. In this context, ammonia (NH3) acts as a neutral ligand, donating a pair of electrons from its nitrogen atom to the metal ion.

Lewis Acid-Base Interaction

In the formation of coordination complexes, a Lewis acid (the metal ion) accepts electron pairs from a Lewis base (the ligand). This interaction underpins the formation of dative covalent bonds, as the ligand donates its electrons to the electron-deficient metal center.

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