Solid-State NMR Characterization of C-13 and N-15 Labeled Phthalimides as Model Compounds for Studying Polyimides
Polymers and High Performance Materials
N-15 CSA spectra were acquired for four isotopically labeled bisphthalimide compounds. The N-15 CSA tenser elements (delta(11), delta(22), and delta(33)) for the labeled derivatives were determined from CSA lineshape analysis. In addition, the CSA spectrum for the N-15, C-13-labeled N-methylphthalimide was obtained. From CSA lineshape analysis, it was determined that delta(33) lies approximately along the N-C bond axis, with delta(22) assumed to be approximately perpendicular to the imide plane. The angles alpha and beta were found to be 90 degrees and 7 degrees, respectively. The dipolar coupling constant for the C-13-N-15 bond was 883 Hz, corresponding to a bond length of 1.51 Angstrom. (C) 1995 Academic Press, Inc.
Journal of Magnetic Resonance Series A
Jarrett, W. L.,
Johnson, G. C.,
Mathias, L. J.
(1995). Solid-State NMR Characterization of C-13 and N-15 Labeled Phthalimides as Model Compounds for Studying Polyimides. Journal of Magnetic Resonance Series A, 116(2), 156-160.
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