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1 H n.m.r. spectra of N ‐phenylmaleimide in isotropic and nematic phases
Author(s) -
Khetrapal C. L.,
Diehl P.,
Kunwar A. C.
Publication year - 1977
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270100147
Subject(s) - liquid crystal , isotropy , conformational isomerism , coupling constant , spectral line , dipole , crystallography , symmetry (geometry) , spin (aerodynamics) , chemistry , materials science , condensed matter physics , nuclear magnetic resonance , molecular physics , molecule , physics , thermodynamics , optics , geometry , quantum mechanics , organic chemistry , mathematics
1 H n.m.r. spectra of N ‐phenylmaleimide have been investigated in isotropic as well as nematic phases; the chemical shifts, the direct dipolar and the indirect spin–spin coupling constants have been determined. The direct dipolar coupling constants are consistent with rapidly interconverting energetically equivalent twisted conformations of C 2 symmetry. Under the assumption that only two such conformers are predominantly present, the angle between the phenyl and the maleimide planes is determined as 52.9±0.9°.
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