2. When an anhydrous solution of CrCl₂ in EtOH was treated with ligand 1 (below), a precipitate of complex X appeared, and this was filtered off under an atmosphere of nitrogen. A sample of 'hydrated chromium(III) chloride' (actually, [CrCl2(H2O)4]Cl-2H2O) was dissolved in dimethylformamide and boiled (153 °C) to remove water. To the resulting purple solution was added an excess of ligand 1 (below) at 130 °C. On allowing the mixture to cool, a precipitate appeared, complex Y. Analytical and magnetic data for X and Y are given below. Complex X N NH2 1 Complex Y Found: % C=42.4, H = 4.8, N = 16.5, Cl Found: % C = 38.4, H = 4.4, CI = 28.5, = 21.0, Cr 15.5 = Magnetic moment = 4.9 μB Cr = 13.9. Magnetic moment = 3.87 MB a. Explain all the analytical data and the information in the description above, hence deduce possible structures for X and Y. Explain your reasoning. b. What is the likely geometry of the anionic ligands for complex X? Explain your reasoning. C. How many geometric isomers are possible for complex X and complex Y? d. Sketch the isomers (you can use an abbreviation like N N' for ligand 1).
2. When an anhydrous solution of CrCl₂ in EtOH was treated with ligand 1 (below), a precipitate of complex X appeared, and this was filtered off under an atmosphere of nitrogen. A sample of 'hydrated chromium(III) chloride' (actually, [CrCl2(H2O)4]Cl-2H2O) was dissolved in dimethylformamide and boiled (153 °C) to remove water. To the resulting purple solution was added an excess of ligand 1 (below) at 130 °C. On allowing the mixture to cool, a precipitate appeared, complex Y. Analytical and magnetic data for X and Y are given below. Complex X N NH2 1 Complex Y Found: % C=42.4, H = 4.8, N = 16.5, Cl Found: % C = 38.4, H = 4.4, CI = 28.5, = 21.0, Cr 15.5 = Magnetic moment = 4.9 μB Cr = 13.9. Magnetic moment = 3.87 MB a. Explain all the analytical data and the information in the description above, hence deduce possible structures for X and Y. Explain your reasoning. b. What is the likely geometry of the anionic ligands for complex X? Explain your reasoning. C. How many geometric isomers are possible for complex X and complex Y? d. Sketch the isomers (you can use an abbreviation like N N' for ligand 1).
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter20: Transition Metals And Coordination Chemistry
Section: Chapter Questions
Problem 100IP
Related questions
Question
![2. When an anhydrous solution of CrCl₂ in EtOH was treated with ligand 1
(below), a precipitate of complex X appeared, and this was filtered off under an
atmosphere of nitrogen. A sample of 'hydrated chromium(III) chloride' (actually,
[CrCl2(H2O)4]Cl-2H2O) was dissolved in dimethylformamide and boiled (153 °C) to
remove water. To the resulting purple solution was added an excess of ligand 1
(below) at 130 °C. On allowing the mixture to cool, a precipitate appeared, complex
Y. Analytical and magnetic data for X and Y are given below.
Complex X
N
NH2
1
Complex Y
Found: % C=42.4, H = 4.8, N = 16.5, Cl Found: % C = 38.4, H = 4.4, CI = 28.5,
= 21.0, Cr 15.5
=
Magnetic moment = 4.9 μB
Cr = 13.9.
Magnetic moment =
3.87 MB
a. Explain all the analytical data and the information in the description above,
hence deduce possible structures for X and Y. Explain your reasoning.
b. What is the likely geometry of the anionic ligands for complex X? Explain
your reasoning.
C. How many geometric isomers are possible for complex X and complex Y?
d. Sketch the isomers (you can use an abbreviation like N N' for ligand 1).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F73a1dac6-6d24-42b7-bf1d-03910e18d4f8%2F925c9974-0972-4166-b879-c5366952d090%2F8bbczp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. When an anhydrous solution of CrCl₂ in EtOH was treated with ligand 1
(below), a precipitate of complex X appeared, and this was filtered off under an
atmosphere of nitrogen. A sample of 'hydrated chromium(III) chloride' (actually,
[CrCl2(H2O)4]Cl-2H2O) was dissolved in dimethylformamide and boiled (153 °C) to
remove water. To the resulting purple solution was added an excess of ligand 1
(below) at 130 °C. On allowing the mixture to cool, a precipitate appeared, complex
Y. Analytical and magnetic data for X and Y are given below.
Complex X
N
NH2
1
Complex Y
Found: % C=42.4, H = 4.8, N = 16.5, Cl Found: % C = 38.4, H = 4.4, CI = 28.5,
= 21.0, Cr 15.5
=
Magnetic moment = 4.9 μB
Cr = 13.9.
Magnetic moment =
3.87 MB
a. Explain all the analytical data and the information in the description above,
hence deduce possible structures for X and Y. Explain your reasoning.
b. What is the likely geometry of the anionic ligands for complex X? Explain
your reasoning.
C. How many geometric isomers are possible for complex X and complex Y?
d. Sketch the isomers (you can use an abbreviation like N N' for ligand 1).
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