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Two-dimensional NMR and 13C spin—lattice relaxation study of methyl fluorene-3-carboxylate

✍ Scribed by D. Pissas; Photis Dais; Francoise Sauriol

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
612 KB
Volume
29
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^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.

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