Synthesis and Solid-State NMR Characterization of 13C- and 15N-Labelled N-Methylphthalimide: A Model Compound for Studying Polyimides
Technical rept. 1 Jun 1993-31 May 1994
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
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The Gabriel method allows preparation of imide derivatives from methyl iodide in good yields. The 1H T1S were approximately 65-78 s for all protons, including the aromatic protons. 13C CPMAS NMR spectra of the model N- methylphthalimides showed multiplet peaks for the aromatic carbons which may be due to differences in crystal packing. However, the 15N spectra show a single peak for imides 2 and 3. A procedure has been developed for incorporating 15N and 13C isotopic labelling into N-methylphthalimide, a model imide. From solid- state 15N NMR spectroscopic methods the values and orientation of the delta shift tensor with respect to the N-CH3 bond as well as the N-CH3 bond length have been determined.
- Organic Chemistry
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy