✦ LIBER ✦

Mobility of side chains in a discotic liquid crystal studied by deuteron spin relaxation

✍ Scribed by Ronald Y. Dong; R. Shearer

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 246 KB
Volume: 375
Category: Article
ISSN: 0009-2614
DOI: 10.1016/s0009-2614(03)00888-1

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✦ Synopsis

A hexaether-substituted rufigallol mesogen is studied by measuring deuteron spin-lattice relaxation times T 1Z and T 1Q in the hexagonal D ho phase. Small-step rotations of discotic molecules within each column are described by the socalled Ôanisotropic viscosityÕ model, giving rotational diffusion constants D a and D b for rotations of the disc normal around and perpendicular to the director. A libration model is used to describe the wagging motions in different side chains as seen by the first CD bonds, which diffuse in a circular arc within a defined apex angle. The chain libration rates and corresponding apex angles are also derived.

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