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I11.4 The protein haemerythrin is responsible for binding and carrying O, in some invertebrates. Each protein molecule has two Fe* ions that are in very close proximity and work together to bind one molecule of 0,. The Fe,O, group of oxygenated haemerythrin is coloured and has an electronic absorption band at 500 nm. The Raman spectrum of oxygenated haemerythrin obtained with laser excitation at 500 nm has a band at 844 cm that has been attributed to the O-0 stretching mode of bound "0,. (a) Proof that the 844 cm" band arises from a bound O, species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with "O, instead of "O,. Predict the fundamental vibrational wavenumber of the "O-"O stretching mode in a sample of haemerythrin that has been treated with "O,. (b) The fundamental vibrational wavenumbers for the O-0 stretching modes of O, O, (superoxide anion), and O (peroxide anion) are 1555, 1107, and 878 cm", respectively. Explain this trend in terms of the electronic structures of O, O, and O. Hint: Review Topic 9C. What are the bond orders of O, O, and O? ? (c) Based on the data given above, which of the following species best describes the Fe,O, group of haemerythrin: Fe*,0, Fe*Fe*O, or Fe",O ? Explain your reasoning. (d) The Raman spectrum of haemerythrin mixed with "O"O has two bands that can be attributed to the 0-0 stretching mode of bound oxygen. Discuss how this observation may be used to exclude one or more of the four proposed schemes (7-10) for binding of O, to the Fe, site of haemerythrin. 7 8 9 10

I11.4 The protein haemerythrin is responsible for binding and carrying O, in some invertebrates. Each protein molecule has two Fe* ions that are in very close proximity and work together to bind one molecule of 0,. The Fe,O, group of oxygenated haemerythrin is coloured and has an electronic absorption band at 500 nm. The Raman spectrum of oxygenated haemerythrin obtained with laser excitation at 500 nm has a band at 844 cm that has been attributed to the O-0 stretching mode of bound "0,. (a) Proof that the 844 cm" band arises from a bound O, species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with "O, instead of "O,. Predict the fundamental vibrational wavenumber of the "O-"O stretching mode in a sample of haemerythrin that has been treated with "O,. (b) The fundamental vibrational wavenumbers for the O-0 stretching modes of O, O, (superoxide anion), and O (peroxide anion) are 1555, 1107, and 878 cm", respectively. Explain this trend in terms of the electronic structures of O, O, and O. Hint: Review Topic 9C. What are the bond orders of O, O, and O? ? (c) Based on the data given above, which of the following species best describes the Fe,O, group of haemerythrin: Fe*,0, Fe*Fe*O, or Fe",O ? Explain your reasoning. (d) The Raman spectrum of haemerythrin mixed with "O"O has two bands that can be attributed to the 0-0 stretching mode of bound oxygen. Discuss how this observation may be used to exclude one or more of the four proposed schemes (7-10) for binding of O, to the Fe, site of haemerythrin. 7 8 9 10

Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter18: Raman Spectroscopy
Section: Chapter Questions
Problem 18.9QAP
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I11.4 The protein haemerythrin is responsible for binding and carrying O, in some invertebrates. Each protein molecule has two Fe* ions that are in very close proximity and work together to bind one molecule of 0,. The Fe,O, group of oxygenated haemerythrin is coloured and has an electronic absorption band at 500 nm. The Raman spectrum of oxygenated haemerythrin obtained with laser excitation at 500 nm has a band at 844 cm that has been attributed to the O-0 stretching mode of bound "0,. (a) Proof that the 844 cm" band arises from a bound O, species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with "O, instead of "O,. Predict the fundamental vibrational wavenumber of the "O-"O stretching mode in a sample of haemerythrin that has been treated with "O,. (b) The fundamental vibrational wavenumbers for the O-0 stretching modes of O, O, (superoxide anion), and O (peroxide anion) are 1555, 1107, and 878 cm", respectively. Explain this trend in terms of the electronic structures of O, O, and O. Hint: Review Topic 9C. What are the bond orders of O, O, and O? ? (c) Based on the data given above, which of the following species best describes the Fe,O, group of haemerythrin: Fe*,0, Fe*Fe*O, or Fe",O ? Explain your reasoning. (d) The Raman spectrum of haemerythrin mixed with "O"O has two bands that can be attributed to the 0-0 stretching mode of bound oxygen. Discuss how this observation may be used to exclude one or more of the four proposed schemes (7-10) for binding of O, to the Fe, site of haemerythrin.
Transcribed Image Text:I11.4 The protein haemerythrin is responsible for binding and carrying O, in some invertebrates. Each protein molecule has two Fe* ions that are in very close proximity and work together to bind one molecule of 0,. The Fe,O, group of oxygenated haemerythrin is coloured and has an electronic absorption band at 500 nm. The Raman spectrum of oxygenated haemerythrin obtained with laser excitation at 500 nm has a band at 844 cm that has been attributed to the O-0 stretching mode of bound "0,. (a) Proof that the 844 cm" band arises from a bound O, species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with "O, instead of "O,. Predict the fundamental vibrational wavenumber of the "O-"O stretching mode in a sample of haemerythrin that has been treated with "O,. (b) The fundamental vibrational wavenumbers for the O-0 stretching modes of O, O, (superoxide anion), and O (peroxide anion) are 1555, 1107, and 878 cm", respectively. Explain this trend in terms of the electronic structures of O, O, and O. Hint: Review Topic 9C. What are the bond orders of O, O, and O? ? (c) Based on the data given above, which of the following species best describes the Fe,O, group of haemerythrin: Fe*,0, Fe*Fe*O, or Fe",O ? Explain your reasoning. (d) The Raman spectrum of haemerythrin mixed with "O"O has two bands that can be attributed to the 0-0 stretching mode of bound oxygen. Discuss how this observation may be used to exclude one or more of the four proposed schemes (7-10) for binding of O, to the Fe, site of haemerythrin.
7 8 9 10
Transcribed Image Text:7 8 9 10
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