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Nanostructures of Nematic Materials of Laterally Branched Molecules

Nanostructures of Nematic Materials of Laterally Branched Molecules

Randall Breckon, Saonti Chakraborty, Cuiyu Zhang, Nicholas Diorio, James T Gleeson, Samuel Sprunt, Robert J Twieg, Antal Jákli

Chemphyschem. 2014 May 19;15(7):1457-62.

PMID: 24039014

Abstract:

The synthesis and small-angle X-ray scattering (SAXS) characterization is reported for 20 laterally branched mesogenic molecules, which are derived from the common rod-shaped 2,5-bis([4-(octyloxy)phenyl]carbonyloxy) benzoic acid unit. These compounds have a varying degree of flexibility, in that their lateral branch is formed upon conversion of the acid to either an ester or an amide, and most laterally branched molecules exhibit relatively wide nematic liquid-crystal phases with a direct nematic-to-crystal transition at lower temperatures. SAXS studies reveal the presence of smectic-like nanostructures (clusters) with short-range order in the nematic phase, with characteristic correlation lengths from 3 to over 10 nm. The smectic layers that are contained in these clusters are tilted with respect to the nematic director by angles ranging from 0° (i.e. untilted) to 55°. In some compounds, the intensity of the SAXS peak corresponding to the smectic layer spacing depends strongly on temperature. The main features of the nanostructures can be understood based on the molecular structure; therefore, guiding future synthetic work towards more precisely controlled and technologically useful nanostructures in nematics.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2493847	4-(Octyloxy)benzoic acid		2493-84-7	Price

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