Abstract
Bent-core molecules with a linear alkyl chain in the bay position (anchor shaped molecules) form new liquid crystalline phases combining periodicities with different coherence lengths in distinct directions; in these LC phases the molecules are organized on average orthogonal in modulated layers (ribbons or patches) with restricted rotation around the long axis, thus representing modulated SmA(b) phases.
Highlights
Bent-core molecules with a linear alkyl chain in the bay position form new liquid crystalline phases combining periodicities with different coherence lengths in distinct directions; in these Liquid crystals (LCs) phases the molecules are organized on average orthogonal in modulated layers with restricted rotation around the long axis, representing modulated SmAb phases
Though there are some few previous reports about bent-core mesogens with additional lateral alkyl chains, these were attached either to the convex outer side of the bent core,[7] or to the peripheral rod-like wings,[8,9] which both lead to a suppression of the positional order, predominately generating isotropic liquids and nematic phases
SmAb/c2mm# 126 [19.4] Iso 22 Cr 145 [64.7] SmAb/c2mm# 147 [21.4] Iso a Transition temperatures and corresponding enthalpy values were determined by DSC; monotropic transitions were determined on cooling; abbreviations: SmAb# = biaxial SmA phase formed by intercalated ribbons with short range correlation; SmAb/c2mm# = modulated, smectic phase with short range rectangular c2mm lattice; Colrec/c2mm# = rectangular columnar mesophase with long range c2mm lattice. # indicates the presence of an additional short range electron density modulation
Summary
Bent-core molecules with a linear alkyl chain in the bay position (anchor shaped molecules) form new liquid crystalline phases combining periodicities with different coherence lengths in distinct directions; in these LC phases the molecules are organized on average orthogonal in modulated layers (ribbons or patches) with restricted rotation around the long axis, representing modulated SmAb phases.
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