2004
DOI: 10.1080/15421400490435017
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Symmetrical Dimer Liquid Crystals with Tilted Smectic Phases

Abstract: Three series of symmetrical dimer liquid crystals, i.e. bis(dodecyloxybenzoyloxybenzoyloxy)alkanes (BC12) and bis(dodecyloxy-and hexadecyloxybenzoyloxyphenyl) alkanedicarboxylates (QC12 and QC16) with a spacer ranging from two to eight methylene units, have been synthesized and their thermotropic properties were characterized. The isotropization temperatures show a pronounced odd -even effect as a function of the parity of the spacers. Most compounds exhibit a SmC mesophase. The QC12 and QC16 compounds, with a… Show more

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Cited by 6 publications
(5 citation statements)
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“…The d-value of 29.4 Å is only nearly half the molecular length of 8BP5, L = 58.2 Å. The ratio d = L/2 found in several symmetric dimer series [11,17,[34][35][36][37] has often been associated to the formation of intercalated smectic phases whose fundamental characteristics resemble those initially reported for non-symmetric dimers. [38,39] Such intercalation of dimers is easy to visualise for systems with terminal chains shorter than spacers, [11,35] but arduous when molecular structures do not meet this condition.…”
Section: Liquid Crystalsmentioning
confidence: 87%
See 1 more Smart Citation
“…The d-value of 29.4 Å is only nearly half the molecular length of 8BP5, L = 58.2 Å. The ratio d = L/2 found in several symmetric dimer series [11,17,[34][35][36][37] has often been associated to the formation of intercalated smectic phases whose fundamental characteristics resemble those initially reported for non-symmetric dimers. [38,39] Such intercalation of dimers is easy to visualise for systems with terminal chains shorter than spacers, [11,35] but arduous when molecular structures do not meet this condition.…”
Section: Liquid Crystalsmentioning
confidence: 87%
“…[38,39] Such intercalation of dimers is easy to visualise for systems with terminal chains shorter than spacers, [11,35] but arduous when molecular structures do not meet this condition. [17,[35][36][37] Likewise, it is difficult to rationalise how the aliphatic sublayer of the 5-membered spacer of 8BP5 could accommodate two 8-membered terminal chains. At this stage, it could only be hypothesised that the smectic organisation in this series is locally of the single-layer type but with non-periodic fluctuations causing the aliphatic sublayers to appear as randomly mixed with a correlation distance (d = L/ 2) associated to the distinction of the combined aliphatic sublayers and a mesogenic unit rather than to the correlation length associated to the local smectic organisation.…”
Section: Liquid Crystalsmentioning
confidence: 99%
“…The influence of the orientation of the ester group in bimesogenic compounds was investigated by Achten et al [9] using the examples of compounds containing a phenyl benzoate mesogenic unit, but different from our D series (scheme 9). They observed dramatically different LC properties of two series compounds (n varied between 2 and 8).…”
Section: Series D: 44'-(alkylenedioxy)dibenzoic Acid 4"-decyloxyphenmentioning
confidence: 99%
“…According to literature reports [6,8,9] these are areas that are not clearly understood, and need some essential investigation at the examples of compounds of relatively simple structure; the systematic investigations of Weissflog et al [10] concerned banana-calamitic dimers consisting of five and two-ring segments.…”
Section: Introductionmentioning
confidence: 99%
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