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Molecular deformations induced by liquid crystalline solvents, J. Mag. Res., 10, 372 - 379 (1973).

By G. F. Pedulli, C. Zannoni and A. Alberti


INTRODUCTION The problem of establishing whether the geometry of a nonplanar flexible radical may be altered when going from the isotropic phase to the nematic mesophase of a liquid crystalline solvent has received attention in two recent papers (1, 2). Falle and Luckhurst (1) examined the triphenylmethyl radical, studying the temperature dependence of the proton coupling constants in the nematic mesophase of 4,4'- dimethoxyazoxybenzene. By lowering the temperature they found that the ortho and para splittings decrease initially, pass through a minimum, and finally increase. The explanation of this unusual behavior, which cannot be due only to the increased alignment in the mesophase, was found in the flexible geometry of the radical by proposing that the solute molecules undergo a deformation by the liquid crystalline solvent towards a more planar conformation. Haustein, Dinse, and M6bius (2), by looking at the ESR spectra of the anion radical of tetracyanoquinodimethane, observe

Year: 1973
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