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Two‐dimensional NMR and 13 C spin—lattice relaxation study of methyl fluorene‐3‐carboxylate
Author(s) -
Pissas D.,
Dais Photis,
Sauriol Francoise
Publication year - 1991
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260291205
Subject(s) - chemistry , principal axis theorem , fluorene , moment of inertia , carboxylate , second moment of area , relaxation (psychology) , anisotropy , molecule , crystallography , molecular physics , nuclear magnetic resonance , stereochemistry , physics , geometry , polymer , classical mechanics , organic chemistry , thermodynamics , psychology , social psychology , mathematics , quantum mechanics
13 C nuclear magnetic relaxation rates were measured as a function of temperature for methyl fluorene‐3‐carboxylate and used to describe the dynamics of this molecule. The easiest reorientation is about the x principal diffusion axis, which is situated close to that inertial principal axis corresponding to the smallest moment of inertia. The reorientation of this planar asymmetric rotor is found to be anisotropic about the in‐plane x and y axes, as expected from unequal moments of inertia. The reorientation about the out‐of‐plane axis z is faster at the lowest temperature measured and it becomes comparable to the in‐plane motion at the remaining temperatures, showing decreased frictional forces for rotation in the molecular plane. Total assignment of the 1 H and 13 C NMR spectra of the fluorene derivative was achieved by employing 1D and 2D NMR techniques.