Smectic Mesophase Properties of Dimeric Compounds. 2. Distinct Formation of Smectic Structures with Antiferroelectric Ordering and Frustration

Bent‐core mesogens based on semi‐flexible dicyclohexylmethane spacers

“…All the other reagents were used as purchase from Aldrich. 1 H (300 MHz) and 13 temperatures and textures were determined using a Zeiss Labpol polarizing microscope equipped with a Linkam TH600 hot stage and PR600 temperature controller. The enthalpies of transitions were determined from thermograms recorded on a Perkin-Elmer DSC-7 differential scanning calorimeter operated at scanning rates of 5-10 K min 21 .…”

“…Additionally, flexible dimers have been shown [12,13] to form ferroand antiferro-electric phases and switching properties have been demonstrated.…”

Huge dielectric constants of the ferroelectric smectic-A phase in bent-shaped dimeric molecules

“…4,5 The bent-shaped dimeric molecules with two aromatic mesogens linked by an odd-carbon numbered alkyl spacer are another type of bent-shaped dimeric molecules that form polar phases. [6][7][8][9] Two mesogens in a molecule are forced to be relatively tilted to each other by the conformational constraint of the alkyl spacer. 3,10 The typical molecules are α,ω-bis(4alkoxyanilinebenzylidene-4′-carbonyloxy)pentanes (mOAM5AMOm) [7][8][9] with the formula shown in Fig.…”

Symmetrical Dimer Liquid Crystals with Tilted Smectic Phases

“…Dimeric liquid crystals containing two rigid monomeric units connected via a flexible alkylene spacer, have been investigated intensely in the last decade [1][2][3][4][5]. One of the most important reasons why these compounds gain so much interest is because their properties are quite different from monomeric liquid crystals.…”