Sensitivity of the N_TBphase formation to the molecular structure of imino-linked dimers

Abstract

Table S1. X-ray data from the 2D patterns: (2obs … experimental scattering angle; dobs … experimental d value; n … order of reflection and d … layer spacing: for the SmCC phase). a) Position of the maxima of the diffuse scattering and the layer reflections in the small angle region (because of the shape of the diffuse scattering curves the values are of limited accuracy, especially those for the very weak innermost maxima or shoulders): Compound T/°C Phase 2obs/° dobs/nm n d / nm * Data from wide angle patterns (sampledetector distance = 9.3 cm) # The discrepancies between these values and those cited in [10] result from the very limited accuracy of the determination of the maxima for the inner diffuse scattering in the WAXD patterns used in [10].

Induced smectic phase in binary mixtures of twist-bend nematogens

“…The pattern of the N TB phase differs from that of the N phase mainly by a certain loss of orientation (Fig. 3 and Figure S1, Supporting Information File 1 for additional data) as frequently found at the N–N TB transition [2,17,21]. The inner scattering is too weak to find the maximum but can be estimated to be near that of the N phase, which has its maxima at about 1.8 nm for the d value.…”

“…Previously we reported on the mesomorphic behaviour of various imino-linked dimers that displayed both uniaxial nematic (N) and twist-bend nematic phases (N TB ) [16–17]. Continuing our investigation on these systems, we performed a study on how mixing two imino-linked bent-shaped dimers with a rather large difference in molecular length affects their mesomorphic properties.…”

Conformational landscapes of bimesogenic compounds and their implications for the formation of modulated nematic phases

“…A number of reviews concerning the twist-bend phase have been published recently [18][19][20]. A relatively large number of dimeric liquid crystals are known to exhibit this state of matter [1,3,8,9,11,12,[21][22][23][24][25][26][27][28][29][30], and there is a growing number of liquid-crystalline oligomers known to exhibit the twist-bend phase [18,[31][32][33][34]. Additionally, this phase has been observed in a phenylpiperazine derived bent-core liquid crystal [4].…”

Optically active bimesogens incorporating branched central spacers

“…The TB phase exhibits a number of striking optical textures 6,10 and has been further characterised by NMR, [11][12][13] PRS, 14 SAXS 15 and under applied electric 16 and magnetic elds. 17 Transitions from the TB phase into other phases are rare, although a few examples of such transitions to smectic [18][19][20][21][22] and B 6 phases 23,24 are known. This phase was rst identied in liquid-crystalline dimers, 23,[25][26][27] and a relatively large number of compounds are now known to, or are suspected of, exhibiting this phase.…”