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1. On a hot summer day, when washing the isolated violet [Cu(deen)2](BF4)2 salt on the Buchner funnel with ether, some students report seeing a red color? Can you rationalize why this might be?

1. On a hot summer day, when washing the isolated violet [Cu(deen)2](BF4)2 salt on the Buchner funnel with ether, some students report seeing a red color? Can you rationalize why this might be?

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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1. On a hot summer day, when washing the isolated violet [Cu(deen)2](BF4)2 salt on the Buchner funnel with ether, some students report seeing a red color? Can you rationalize why this might be? 2. What are the main differences in the coordination environment of Cu(II) between the red and blue- violet forms of [Cu(deen)2](ClO4)2? Hint: Look at the X-ray diffraction crystal structure data from reference 1. Compare the experimental coordination configuration around Cu(II) and the Cu-N bond distances and N- Cu-N angles in the complexes. 3. Why is there no axial Cu-F or Cu-O interaction in the complexes [Cu(deen)2][BF4]2 or [Cu(deen)2][CIO4]2 as opposed to the [Cu(R-en):]X2 complexes ? (Hint: see reference 1) 4. Explain why [Cu(deen)2]X2 (X = BF4, Cl04 and NO;) show thermochromic behavior, whereas most other bis-diamine Cu(II) complexes (e.g. ethylenediamine) do not exhibit this property. 5. Explain why neither [Cu(deen)2][X]2 salts dissolved in ethanol solution would not show thermochromic behavior whereas both the solid can change color upon heating/cooling. 6. Why are the colors of transition metal compounds affected by the coordination geometry about the central metal ion (explain using a diagram that includes at least one geometry not shown in Figure 5-4)?
Transcribed Image Text:1. On a hot summer day, when washing the isolated violet [Cu(deen)2](BF4)2 salt on the Buchner funnel with ether, some students report seeing a red color? Can you rationalize why this might be? 2. What are the main differences in the coordination environment of Cu(II) between the red and blue- violet forms of [Cu(deen)2](ClO4)2? Hint: Look at the X-ray diffraction crystal structure data from reference 1. Compare the experimental coordination configuration around Cu(II) and the Cu-N bond distances and N- Cu-N angles in the complexes. 3. Why is there no axial Cu-F or Cu-O interaction in the complexes [Cu(deen)2][BF4]2 or [Cu(deen)2][CIO4]2 as opposed to the [Cu(R-en):]X2 complexes ? (Hint: see reference 1) 4. Explain why [Cu(deen)2]X2 (X = BF4, Cl04 and NO;) show thermochromic behavior, whereas most other bis-diamine Cu(II) complexes (e.g. ethylenediamine) do not exhibit this property. 5. Explain why neither [Cu(deen)2][X]2 salts dissolved in ethanol solution would not show thermochromic behavior whereas both the solid can change color upon heating/cooling. 6. Why are the colors of transition metal compounds affected by the coordination geometry about the central metal ion (explain using a diagram that includes at least one geometry not shown in Figure 5-4)?
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