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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
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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).
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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