1. On a hot summer day, when washing the isolated violet [Cu(deen)2](BF4)2 salt on the Buchner funnel withether, 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- violetforms 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 mostother 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 thermochromicbehavior 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 centralmetal ion (explain using a diagram that includes at least one geometry not shown in Figure 5-4)?

Solution: Given complex : Cu( deen )2BF42 Since you have asked multiple questions, we will solve…

Answered: 1. On a hot summer day, when washing…

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

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Coordination Chemistry

It is a part of chemistry, in which the study of compounds that have central atoms surrounded by molecules or ions, known as ligand, is known as coordination chemistry.

Question

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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