Abstract
New non-centrosymmetric soft honeycomb lattices and superlattices are generated by self-assembly of novel mesogens promising applications as SHG and ferroelectric materials.
Highlights
The aromatic cores do not have to be straight, and a few examples of honeycomb-generating bent core polyphiles have been reported
Six compounds were synthesised based on a symmetric bent 1,3-bis(phenylethynyl)benzene ‘‘bistolane’’ core with glycerol end-groups, a chain Rc in 2-position that is either a linear semiperfluorinated or a branched ‘‘swallow-tail’’ alkyl, and in addition with a functional headgroup Rh in 5-position – see Table 1
For synthesis see the Electronic supplementary information (ESI).† The compounds were studied by polarized optical microscopy (POM), differential scanning calorimetry (DSC), small- and wide-angle X-ray scattering (SAXS and WAXS), grazing incidence SAXS and WAXS (GISAXS and GIWAXS) on thin films, second harmonic generation (SHG) light emission, and molecular modelling and molecular dynamics (MD) annealing
Summary
The aromatic cores do not have to be straight, and a few examples of honeycomb-generating bent core polyphiles have been reported. Calculations based on unit cell area, expected average intracolumnar intermolecular distance and molecular volumes (Table S8, ESI†), suggest that in CO2CH3–F, Br–H, CONH2–F and CN–H there are 3 molecules circumscribing a column rather than 6.
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