Interpreting spectral data. The graph shows the 1H-nuclear magnetic resonance chemical shift of the H 4 proton
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Interpreting spectral data. The graph shows the 1H-nuclear magnetic resonance chemical shift of the H4 proton on pyridine as a function of pH. Chemical shift is related to the environment of a proton in a molecule. If the environment changes, the chemical shift changes. Suggest an explanation for why the chemical shift changes between low pH and high pH. Estimate pKa for pyridinium ion (C5H5NH+).
Transcribed Image Text:
8.8 8.7 8.6 H4 H3 8.5 8.4 8.3 H2 8.2 Pyridine 8.1 I 8.0 7.9 7.8 1 2 4 5 6 9 10 11 12 13 7 8 pH H4 Chemical shift (ppm) 3.
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As we all know that pyridine is a base Whenever it is in the environment of low pH ie in acidic envi...View the full answer
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