The Use of Protonation Induced Changes in Carbon-13 NMR Chemical Shifts to Investigate the Solution Microscopic Structure of Partially Protonated Polybasic Molecules |
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| Authors: | Joseph E Sarneski Henry L Surprenant Charles N Reilley |
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| Institution: | 1. Department of Chemistry , University of North Carolina , Chapel Hill, N.C., 27514;2. Department of Chemistry , Fairfield University , Fairfield, Connecticut, 06430 |
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| Abstract: | Abstract Changes in the NMR chemical shift of carbon-13 nuclei upon protonation of a nearby basic center are shown to be a useful method of probing the microscopic site of protonation of molecules containing multiple basic centers, such as diethylenetriaminepenta-acetic acid (DTPA). This approach is also shown to support the predominance of the pyridine amine protonated tautomer in the 4-pyridone ? 4-hydroxypyridine equilibrium. |
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| Keywords: | Protonation DTPA 4-Pyridone Carbon-13 NMR |
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