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要旨:
The molecular dynamics of benzene-hexa-n-heptanoate (BHA7) have been studied in the isotropic liquid phase by multified carbon-13 nuclear spin relaxation of a carboxyl carbon labeled compound. The experimental data are analyzed with a dynamical model based on the assumption of three trypes of motion: a fast internal motion in the aliphatic chains, a slow overall reorientation of the molecule, and an intermediate process connected with the flexibility of the carboxyl group. The first two motions occur clearly on different time scales, whereas the last process is not time scale separated from the global molecular tumbling. Preciously reported carbon-13 line shapes in the mesophase and in the solid state of BHA7 were used for vertification of the results. Measurements of translational diffusion coefficients in isotropic and ordered phases of BHA6 and BHA7 were performed using 1H pulsed field gradient NMR spin-echo techniques.
