350015-46-2Relevant academic research and scientific papers
Spontaneous Mirror-Symmetry Breaking in Isotropic Liquid Phases of Photoisomerizable Achiral Molecules
Alaasar, Mohamed,Prehm, Marko,Cao, Yu,Liu, Feng,Tschierske, Carsten
, p. 312 - 316 (2016)
Spontaneous mirror-symmetry breaking is of fundamental importance in science as it contributes to the development of chiral superstructures and new materials and has a major impact on the discussion around the emergence of uniform chirality in biological
Mirror symmetry breaking in cubic phases and isotropic liquids driven by hydrogen bonding
Alaasar, Mohamed,Poppe, Silvio,Dong, Qingshu,Liu, Feng,Tschierske, Carsten
supporting information, p. 13869 - 13872 (2016/12/06)
Achiral supramolecular hydrogen bonded complexes between rod-like 4-(4-alkoxyphenylazo)pyridines and a taper shaped 4-substituted benzoic acid form achiral (Ia3d) and chiral “Im3m-type” bicontinuous cubic (I432) phases and a chiral isotropic liquid mesophase (Iso1[*]). The chiral phases, resulting from spontaneous mirror symmetry breaking, represent conglomerates of macroscopic chiral domains eventually leading to uniform chirality.
1,1′-Disubstituted ferrocene containing hexacatenar thermotropic liquid crystals
Seo, Jin-Sung,Yoo, Yong-Sik,Choi, Moon-Gun
, p. 1332 - 1338 (2007/10/03)
The preparation and characterization of ferrocene containing hexacatenar metallomesogens 4a - h based on alkoxy terminal groups with hexyloxy (4a), octyloxy (4b), decyloxy (4c), dodecyloxy (4d), tetradecyloxy (4e), hexadecyloxy (4f), octadecyloxy (4g) and eicosyloxy (4h) chains are described. The introduction of alkyl chains of different lengths induces a rich variety of self-assembled liquid crystalline structures. In the crystalline state, the ferrocene containing hexacatenar metallomesogens 4a - h organize into a microphase-separated monolayer lamellar structure. In contrast, a dramatic phase change after crystalline melting of the metallomesogens is observed with variation of the chain length. The ferrocene containing hexacatenar metallomesogens 4b and c display a bicontinuous cubic mesophase with Ia3d symmetry, while the ferrocene containing hexacatenar metallomesogens 4d - g exhibit a hexagonal columnar mesophase. Further increasing the length of the alkyl chain as in the case of 4h suppresses liquid crystallinity and induces only a crystalline phase. This unique behavior in the ferrocene containing metallomesogenic molecules can be understood to originate from the anisotropic aggregation of ferrocene containing aromatic segments and consequent entropic penalties associated with chain stretching.
