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Ch.21 - Transition Elements and Coordination Chemistry
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook
All textbooksMcMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblem 21.96
Chapter 21, Problem 21.96

Draw the structures of all possible diastereoisomers of an octahedral complex with the formula MA2B2C2. Which of the diastereoisomers, if any, can exist as enantiomers?

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1
Identify the ligands: A, B, and C are different ligands in the octahedral complex MA_2B_2C_2.
Consider the arrangement of ligands around the central metal ion in an octahedral geometry.
Recognize that diastereoisomers are non-mirror image stereoisomers, so explore different spatial arrangements of the ligands.
Draw the possible arrangements: 1) A cis arrangement where two identical ligands are adjacent, and 2) A trans arrangement where two identical ligands are opposite each other.
Determine which of these arrangements can have non-superimposable mirror images, indicating the presence of enantiomers.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Octahedral Complexes

Octahedral complexes are coordination compounds where a central metal atom is surrounded by six ligands at the corners of an octahedron. The arrangement of ligands can lead to different geometric isomers, such as facial (fac) and meridional (mer) isomers, which are crucial for understanding the stereochemistry of the complex.
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For octahedral complexes, Weak-Field Ligands create High-spin complexes and Strong-Field Ligands create Low-spin complexes.

Diastereoisomers

Diastereoisomers are stereoisomers that are not mirror images of each other. In octahedral complexes, the presence of multiple types of ligands can lead to different spatial arrangements, resulting in diastereoisomers. These isomers can have different physical properties and reactivities, making their identification important in coordination chemistry.

Enantiomers

Enantiomers are a specific type of stereoisomer that are non-superimposable mirror images of each other. For a diastereoisomer to exist as an enantiomer, it must have a chiral center, which in octahedral complexes can occur depending on the arrangement of the ligands. Understanding chirality is essential for determining which diastereoisomers can exist as enantiomers.
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Drawing Enantiomers
Related Practice
Textbook Question

The amount of paramagnetism for a first-series transition metal complex is related approximately to its spin-only magnetic moment. The spin-only value of the magnetic moment in units of Bohr magnetons (BM) is given by sqrt(n(n + 2)), where n is the number of unpaired electrons. Calculate the spin-only value of the magnetic moment for the 2+ ions of the first-series transition metals (except Sc) in octahedral complexes with (a) weak-field ligands and (b) strong-field ligands. For which electron configurations can the magnetic moment distinguish between high-spin and low-spin electron configurations?

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Textbook Question

Draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons for each of the following.

(a) [Cu(en)3]2+

(b) [FeF6]2-

(c) [Co(en)3]3+ (low spin) 

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Textbook Question

The oxalate ion is a bidentate ligand as indicated in Figure 21.8. Would you expect the carbonate ion to be a monodentate or bidentate ligand? Explain your reasoning.

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Textbook Question

Six isomers for a square planar palladium(II) complex that contains two Cl-and two SCN-ligands are shown below.


(a) Which structures are cis-trans isomers?

(b) Which structures are linkage isomers?

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Textbook Question

Draw a crystal field energy-level diagram for the 3d orbitals of titanium in [Ti(H2O)6]3+]. Indicate the crystal field splitting, and explain why is [Ti(H2O)6]3+] colored.

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Textbook Question

Look at the colors of the isomeric complexes in Figure 21.12, and predict which is the stronger field ligand, nitro (-NO2) of nitrito (-ONO). Explain. 

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