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Solid-State NMR Characterization of13C- and15N-Labeled Phthalimides as Model Compounds for Studying Polyimides

✍ Scribed by WILLIAM L. JARRETT; GREG C. JOHNSON; LON J. MATHIAS

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
116 KB
Volume
116
Category
Article
ISSN
1064-1858

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✦ Synopsis

Tensor evaluations of biological polymers are usually bisphthalimide compounds. The 15 N CSA tensor elements (d 11 , based on labeled-model-compound studies; thus, a series of d 22 , and d 33 ) for the labeled derivatives were determined from CSA labeled model imide compounds based on the phthalimide lineshape analysis. In addition, the CSA spectrum for the 15 N, 13 Cmoiety (C 6 H 4 (CO) 2 N*-R with R Å 0H, 0CH 3 , 0C 16 H 33 , labeled N-methylphthalimide was obtained. From CSA lineshape 0CH 2 C 6 H 5 ) have been synthesized and analyzed by solidanalysis, it was determined that d 33 lies approximately along the state 15 N NMR spectroscopy. In addition, N-[ 13 C]methyl-N-C bond axis, with d 22 assumed to be approximately perpendicu-[ 15 N]phthalimide was synthesized and its solid-state 15 N lar to the imide plane. The angles a and b were found to be 90Њ NMR spectrum acquired in order to obtain information on and 7Њ, respectively. The dipolar coupling constant for the 13 Cthe orientation of the d tensor with respect to the local molec-15 N bond was 883 Hz, corresponding to a bond length of 1.51 A ˚. ular geometry, with the eventual purpose of this study to

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