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Smectic A Formation by Twin Dimers Assuming U-shaped Conformation

Twin dimers with 3-methylpentane spacers behave as U-shaped (folding) molecules if the carbon number of alkyl tail group is longer than 12 and form an S A phase. This behavior is in contrast to that in dimers with linear pentane spacers which assume extended conformation and form the antiferroelectric S CA b . Folding of twin molecules, hence, is another way to accommodate tail groups fairly longer than the spacers, suggesting new potentiality in spontaneous molecular organization.