Label each statement as True or False.a. When a nucleus is strongly shielded, the effective field is larger than the applied field and the absorption shifts downfield.b. When a nucleus is strongly shielded, the effective field is smaller than the applied field and the absorption is shifted upfield.c. A nucleus that is strongly deshielded requires a lower field strength for resonance. d. A nucleus that is strongly shielded absorbs at a larger δ value.

Label each statement as True or False.a. When a nucleus is strongly shielded, the effective field is larger than the applied field and the absorption shifts downfield.b. When a nucleus is strongly shielded, the effective field is smaller than the applied field and the absorption is shifted upfield.c. A nucleus that is strongly deshielded requires a lower field strength for resonance. d. A nucleus that is strongly shielded absorbs at a larger δ value.

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Section13.SE: Something Extra

Problem 33AP

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Label each statement as True or False. a.When a nucleus is strongly shielded, the effective field is larger than the applied field and the absorption shifts downfield. b.When a nucleus is strongly shielded, the effective field is smaller than the applied field and the absorption is shifted upfield. c. A nucleus that is strongly deshielded requires a lower field strength for resonance. d.A nucleus that is strongly shielded absorbs at a larger δ value.
a.) What is the resonance frequency of a proton in a magnetic field of 14.6 T?Ans = ______ MHz b.) Calculate the frequency separation of the nuclear spin levels of a 13C nucleus in a magnetic field of 15.9 T given that the magnetogyric ratio is 6.73 × 107 T-1 s-1. MHz. (Note: because the magnetogyric ratio of 13C nucleus is only about 1/4th of that of a proton, the frequency of resonance is also only about 1/4th of the proton resonance frequency in the same instrument.)
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