(a) Identify the Lewis acid and the Lewis base in the...

(a) Identify the Lewis acid and the Lewis base in the reaction of ethylenediamine $\left(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)$ with $\mathrm{Na}^{2-}$ to form $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$. (b) Identify the ligands and donor atoms. (c) Give the coordination number and geometry of the metal in the complex.

(a) Identify the Lewis acid and the Lewis base in the reaction of ethylenediamine $\left(\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)$ with $\mathrm{Na}^{2-}$ to form $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$.
(b) Identify the ligands and donor atoms.
(c) Give the coordination number and geometry of the metal in the complex.

Key Concepts

Lewis Acid?Base Theory

This concept explains how chemical species interact by exchanging electron pairs. In coordination chemistry, the central metal ion acts as the Lewis acid by accepting electron pairs, while the ligands act as Lewis bases by donating electron pairs. This framework is essential for understanding the formation of coordination complexes through the binding of donor atoms from the ligands to the electron?deficient metal center.

Ligands

Ligands are molecules or ions that can donate one or more electron pairs to a central metal ion to form a coordinate covalent bond. They play a crucial role in determining the structure and properties of coordination complexes by providing electrons from their donor atoms to bond with the metal center.

Donor Atoms

Donor atoms are specific atoms within a ligand that have lone pairs of electrons and are directly involved in bonding with the central metal ion. The identification of donor atoms is key in understanding how ligands attach to the metal and in predicting the coordination environment of the complex.

Coordination Number

The coordination number is defined as the number of donor atoms from the ligands that are directly bonded to the central metal ion. It is an important parameter in determining the structure, stability, and reactivity of coordination compounds.

Coordination Geometry

Coordination geometry refers to the spatial arrangement of the donor atoms around the central metal ion in a coordination complex. This geometry, which can be predicted based on the coordination number, is fundamental in understanding the overall shape and chemical behavior of the complex.

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