title: The effect of the shape of the mesogenic group on the structure and phase behavior of 2,3,4-tris(dodecyloxy)benzenesulfonates with alkaline cations.
abstract: Synthesis and mesophase structure characterisation are reported for a group of alkali salts of 2,3,4-tris(dodecyloxy)benzenesulfonic acid. As revealed by a combination of polarizing optical microscopy, differential scanning calorimetry and X-ray scattering, variation of the effective mesogen shape due to changes of the cation size leads to systematic transformation of the materials' phase behaviour. Thermotropic mesophases of different types and dimensionalities were observed: 1D (smectic bilayers), 2D (ordered and disordered columnar phases), and 3D (high-temperature micellar mesomorphic phase, low-temperature crystalline one). Cubic packing prevails when the cation size is small and, thus, the effective mesogen shape is close to the conic one. With increasing ion size, the mesogen shape becomes more tapered, and columnar mesophases appear to be more stable.
authors.affiliation: Enikolopov Institute of Synthetic Polymer Materials RAS, 70, Profsoyuznaya street, Moscow, 117393, Russian Federation. shcherbina@ispm.ru.
authors.forename: Maxim A
authors.initials: MA
authors.lastname: Shcherbina
authors.forename: Artem V
authors.initials: AV
authors.lastname: Bakirov
authors.forename: Andrei N
authors.initials: AN
authors.lastname: Yakunin
authors.forename: Uwe
authors.initials: U
authors.lastname: Beginn
authors.forename: Linglong
authors.initials: L
authors.lastname: Yan
authors.forename: Martin
authors.initials: M
authors.lastname: Möller
authors.forename: Sergei N
authors.initials: SN
authors.lastname: Chvalun