Abstract
Systematic observations are carried out for molecular alignments of monolayers of homologous series in cyanobiphenyle (CB) liquid crystals such as 6CB to 12CB on highly oriented pyrolytic graphite (HOPG) substrates using a scanning tunneling microscope. For 6CB the molecular alignments are also observed on molybdenum disulfide substrates (MoS 2 ) as well as HOPG. In 6CB monolayers, the characteristic structures indicating both properties of a single and double row previously reported are observed. In 7CB, 9CB and 11CB monolayers only the single row property is observed. The monolayer alignments of 8CB, 10CB and 12CB show on the other hand double row characteristics. Thus all the observed aspects clearly indicate the odd-even effect of carbon numbers in an alkyl chain. The morphology of molecular alignments due to the odd-even effect in monolayers of cyanobiphenyl liquid crystals on HOPG are systematically determined. Based on the experimental observation a qualitative model on the molecular alignments of ...
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