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The two square-planar isomers of [PtBrCl(PR3)2] (where PR3is a trialkylphosphene) have different 31P-NMR spectra as shown below. For this exercise, we ignore the coupling to 195Pt (I=1/2 at 33% abundance). One isomer (A) shows a single 31P resonance; the other (B) shows two 31P resonances, each of which is split into a doublet by the second 31P nucleus. Which isomer is cisand which is trans? Draw the structures of the two isomers.

The two square-planar isomers of [PtBrCl(PR3)2] (where PR3is a trialkylphosphene) have different 31P-NMR spectra as shown below. For this exercise, we ignore the coupling to 195Pt (I=1/2 at 33% abundance). One isomer (A) shows a single 31P resonance; the other (B) shows two 31P resonances, each of which is split into a doublet by the second 31P nucleus. Which isomer is cisand which is trans? Draw the structures of the two isomers.

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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The two square-planar isomers of [PtBrCl(PR3)2] (where PR3is a trialkylphosphene) have different 31P-NMR spectra as shown below. For this exercise, we ignore the coupling to 195Pt (I=1/2 at 33% abundance). One isomer (A) shows a single 31P resonance; the other (B) shows two 31P resonances, each of which is split into a doublet by the second 31P nucleus. Which isomer is cisand which is trans? Draw the structures of the two isomers.

### NMR Spectroscopy: Isomer Analysis The image represents a Nuclear Magnetic Resonance (NMR) spectrum showcasing the spectral lines of two isomers, labeled as (a) A isomer and (b) B isomer. #### Key Features: - **Spectrum Overview:** - The horizontal axis is labeled with the Greek letter δ, representing the chemical shift in parts per million (ppm), a fundamental aspect in analyzing an NMR spectrum. - **Isomer Peaks:** - The spectrum includes two distinct sets of peaks corresponding to two different isomers. - **(a) A Isomer:** - Illustrated by a red spectral line. - The peak appears at a different chemical shift compared to the B isomer, indicating a distinct chemical environment. - **(b) B Isomer:** - Illustrated by a blue spectral line. - Two clear peaks are shown, located symmetrically around the peak of the A isomer, highlighting another unique chemical structure. This NMR spectrum is invaluable in identifying the structural differences between the A and B isomers through their unique chemical environments as indicated by their chemical shifts. Understanding these shifts is essential for determining molecular structures in chemistry.
Transcribed Image Text:### NMR Spectroscopy: Isomer Analysis The image represents a Nuclear Magnetic Resonance (NMR) spectrum showcasing the spectral lines of two isomers, labeled as (a) A isomer and (b) B isomer. #### Key Features: - **Spectrum Overview:** - The horizontal axis is labeled with the Greek letter δ, representing the chemical shift in parts per million (ppm), a fundamental aspect in analyzing an NMR spectrum. - **Isomer Peaks:** - The spectrum includes two distinct sets of peaks corresponding to two different isomers. - **(a) A Isomer:** - Illustrated by a red spectral line. - The peak appears at a different chemical shift compared to the B isomer, indicating a distinct chemical environment. - **(b) B Isomer:** - Illustrated by a blue spectral line. - Two clear peaks are shown, located symmetrically around the peak of the A isomer, highlighting another unique chemical structure. This NMR spectrum is invaluable in identifying the structural differences between the A and B isomers through their unique chemical environments as indicated by their chemical shifts. Understanding these shifts is essential for determining molecular structures in chemistry.
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