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Ch.23 - Transition Metals and Coordination Chemistry
All textbooksBrown 15th EditionCh.23 - Transition Metals and Coordination ChemistryProblem 64a,b
Chapter 23, Problem 64a,b

Complete the exercises below. Draw the crystal-field energy-level diagrams and show the placement of electrons for each of the following complexes: 
a. [VCl6]3–,
b. [FeF6]3– (a high-spin complex),

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Identify the metal ion and its oxidation state in each complex. For [VCl6]3–, vanadium (V) is the metal, and for [FeF6]3–, iron (Fe) is the metal. Determine the oxidation state by considering the charge of the complex and the known charges of the ligands (Cl- and F-).
Determine the electron configuration of the metal ion in its oxidation state. For example, V3+ and Fe3+ have specific electron configurations that can be derived from their neutral atom configurations by removing electrons from the outermost orbitals.
Consider the geometry of the complex. Both [VCl6]3– and [FeF6]3– are octahedral complexes, which means the d-orbitals will split into two sets: t2g (lower energy) and eg (higher energy) due to the crystal field splitting.
For [VCl6]3–, place the electrons in the crystal-field energy-level diagram according to the electron configuration of V3+. Since Cl- is a weak field ligand, the splitting will be small, and electrons will fill the t2g and eg orbitals according to Hund's rule.
For [FeF6]3–, determine the placement of electrons in the crystal-field energy-level diagram for Fe3+. As a high-spin complex with F- as a weak field ligand, the electrons will occupy the orbitals to maximize unpaired electrons, following Hund's rule and the small splitting energy.

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Textbook Question

As shown in Figure 23.26, the d-d transition of [Ti(H2O)6]³⁺ produces an absorption maximum at a wavelength of about 500 nm .


a. What is the magnitude of ∆ for [Ti(H2O)6]³⁺ in kJ/mol?


b. How would the magnitude of ∆ change if the H2O ligands in [Ti(H2O)6]]³⁺ were placed with NH3 ligands?

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A classmate says, “A weak-field ligand usually means the complex is high spin.” Is your classmate correct? Explain.

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For a given metal ion and set of ligands, is the crystal-field splitting energy larger for a tetrahedral or an octahedral geometry?

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Sketch the structure of the complex in each of the following compounds and give the full compound name:

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Sketch the structure of the complex in each of the following compounds and give the full compound name:

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