138567-39-2Relevant academic research and scientific papers
Chiral biphenylacetylene smectic liquid crystals
De Vega, Laura,Ortiz, Pedro D.,Hennrich, Gunther,Omenat, Ana,Tejedor, Rosa M.,Barberaì?, Joaquiì?n,Goì?mez-Lor, Berta,Serrano, Joseì? Luis
, p. 4811 - 4815 (2010)
Standard Sonogashira coupling afforded rod-like, phenylacetylene extended biphenyl mesogens substituted with different chiral alkoxy chains, starting from commercially available 4-(4a?2-bromophenyl)phenol. Depending on the position of the chiral center and the polar nature of the target molecules as determined by the electron withdrawing end-groups, different types of smectic liquid crystals are formed. The liquid crystal phases are fully characterized by polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction. In two cases, the molecular chirality is transferred to the supramolecular assembly, which is proved by circular dichroism measurements in the chiral mesophase. ? 2010 American Chemical Society.
