A homologous series of ketone-type liquid crystal (LC) dimers, namely carbonyl- and thioether-linked cyanobiphenyl-based bent LC dimers (CBCOnSCB), with odd numbers of alkylene spacers (n = 3, 5, 7, and 9), was developed. CBCOnSCB dimers (n = 3, 5, and 7) formed a twist-bend nematic (NTB) phase below the nematic (N) phase. The N to NTB phase-transition temperatures of CBCOnSCB were higher than those of previously reported symmetric bis(thioether)-linked CBSnSCB and asymmetric ether- and thioether-linked CBOnSCB analogs. Compared to the vitrifiable CBSnSCB and CBOnSCB analogs, CBCOnSCB tended to crystallize. Single-crystal X-ray structural analysis of CBCO5SCB was also performed.
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