Skip to main content
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 21.87b
Chapter 21, Problem 21.87b

Tell how many diastereoisomers are possible for each of the following complexes, and draw their structures. 
(c) [Cu(H2O)4Cl2]+
(d) Ru(NH3)3I3

Verified step by step guidance
1
Step 1: Understand the concept of diastereoisomers.

Diastereoisomers are stereoisomers that are not mirror images of each other. In coordination complexes, they arise when there are multiple chiral centers or when the ligands can be arranged in different spatial configurations.

Step 2: Analyze the complex [Cu(H2O)4Cl2]+.

This complex has a coordination number of 6, typically forming an octahedral geometry. The ligands are four water molecules and two chloride ions. Consider the possible arrangements of these ligands around the central copper ion.

Step 3: Determine the possible diastereoisomers for [Cu(H2O)4Cl2]+.

In an octahedral complex with two identical ligands (Cl-), the ligands can be arranged in either a cis or trans configuration. The cis configuration has the two chloride ions adjacent to each other, while the trans configuration has them opposite each other.

Step 4: Analyze the complex Ru(NH3)3I3.

This complex also has a coordination number of 6, suggesting an octahedral geometry. The ligands are three ammonia molecules and three iodide ions. Consider the possible spatial arrangements of these ligands.

Step 5: Determine the possible diastereoisomers for Ru(NH3)3I3.

With three identical ligands (NH3) and three identical ligands (I-), the complex can form facial (fac) and meridional (mer) isomers. In the fac isomer, the three identical ligands are adjacent, forming a face of the octahedron. In the mer isomer, the three identical ligands form a meridian, spanning the octahedron.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?

Key Concepts

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

Diastereoisomers

Diastereoisomers are a type of stereoisomer that are not mirror images of each other. They occur in molecules with multiple chiral centers or in coordination complexes where different arrangements of ligands can lead to distinct spatial configurations. Understanding diastereoisomers is crucial for determining the number of possible isomers for a given complex.

Coordination Complexes

Coordination complexes consist of a central metal atom bonded to surrounding ligands, which can be neutral molecules or ions. The geometry of these complexes, such as octahedral or tetrahedral arrangements, influences the types of isomers that can form. Recognizing the coordination number and geometry is essential for predicting the number of diastereoisomers.
Recommended video:
Guided course
00:43
Coordination Complexes Example

Ligand Types and Their Influence

Ligands can be classified as monodentate, bidentate, or polydentate based on the number of donor atoms they use to bond to the metal center. The nature and arrangement of these ligands significantly affect the stereochemistry of the complex. For example, the presence of bidentate ligands can lead to more complex isomerism, including diastereoisomers.
Recommended video:
Guided course
02:38
Ligand Types
Related Practice
Textbook Question

Cobalt(III) trifluoroacetylacetonate, Co(tfac)3, is a sixc oordinate, octahedral metal chelate in which three planar, bidentate tfac ligands are attached to a central Co atom:

(a) Draw all possible diastereoisomers and enantiomers of Co(tfac)3.

105
views
Textbook Question

What is the systematic name for each of the following ions?

(a) [MnCl4]2-

(b) [Ni(NH3)6]2+

132
views
Textbook Question

Two first-series transition metals have three unpaired electrons in complex ions of the type [MCl4]2-.

(a) What are the oxidation state and the identity of M in these complexes?

(b) Draw valence bond orbital diagrams for the two possible ions.

(c) Based on common oxidation states of first-series transition metals (Figure 21.6), which ion is more likely to exist?

<QUESTION REFERENCES FIGURE 21.6>

76
views
Textbook Question

Give a valence bond description of the bonding in each of the following complexes. Include orbital diagrams for the free metal ion and the metal ion in the complex. Indicate which hybrid orbitals the metal ion uses for bonding, and specify the number of unpaired electrons. 

(b) [NiBr4]2- (tetrahedral) 

112
views
Textbook Question

Assign a systematic name to each of the following ions.

(c) [Fe(H2O)5NCS]2+

(d) [Cr(NH3)2(C2O4)2]-

220
views
Textbook Question

Look at the location in the periodic table of elements A, B, C, and D. What is the electron configuration of the transition metal in each of the following ions?  

(a) A2+

(b) B+

107
views