title: Milestone in the NTB phase investigation and beyond: direct insight into molecular self-assembly.
abstract: Although liquid-crystalline materials are most widely exploited for flat-panel displays, their ability to self-organize into periodically ordered nanostructures gives rise to a broad variety of additional applications. The recently discovered low-temperature nematic phase (N(TB)) with unusual characteristics generated considerable attention within the scientific community: despite the fact that the molecules from which the phase is composed are not chiral, the helicoidal structure of the phase is strongly implicated. Here we report on combined experimental, computational and spectroscopic studies of the structural aspects influencing formation of the N(TB) phase as well as on the molecular organization within the phase. In an extensive DFT study, the structure-property prerequisite was traced to a "bent-propeller" shape of the molecule. We also demonstrate the first utilization of liquid state NMR for direct analysis of intermolecular interactions within thermotropic liquid-crystalline phases, providing new insight into molecular packing that can lead towards design of novel chiral functional materials. The synergy of experimental, computational and NMR studies suggests a syn-parallel helical molecular organization within the N(TB) phase.
authors.affiliation: Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia. Andreja.Lesac@irb.hr.
authors.forename: Trpimir
authors.initials: T
authors.lastname: Ivšić
authors.forename: Marijana
authors.initials: M
authors.lastname: Vinković
authors.forename: Ute
authors.initials: U
authors.lastname: Baumeister
authors.forename: Ana
authors.initials: A
authors.lastname: Mikleušević
authors.forename: Andreja
authors.initials: A
authors.lastname: Lesac