Influence of the molecular length on the occurrence of incommensurate low ordered smectic phases for non-symmetric dimesogenic compounds
- Influence of the molecular length on the occurrence of incommensurate low ordered smectic phases for non-symmetric dimesogenic compounds
- F. HARDOUIN; M. F. ACHARD; M. LAGUERRE; JUNG-IL JIN; 고두현
- Issue Date
- Liquid crystals
- VOL 26, NO 4, 589-599
- Systematic physical chemistry studies are in progress concerning the occurrence of incommensurate low ordered smectic phases (Sic )² in non-symmetric dimesogens with molecular
parameters varying from those of the standard compound KI-5(4). In the present study,
the selected molecules possess the same cholesteryl unit and the same spacer length, but the
terminal chain of the aromatic mesogenic part is varied. Up to a critical molecular length, a
competition between two incommensurate lengths is observed and the dimesogenic compounds
respond to the frustration connected to this competition with the formation either of an
incommensurate phase Sic or of a two dimensional modulated phase. For longer dimesogens,
a commensurate lock-in of the two characteristic lengths systematically occurs.
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