Matrix-molecule induced chiral enhancement effect of binary supramolecular liquid crystals

Self-Assembly and Hierarchies in Pyridine-Containing Homopolymers and Block Copolymers with Hydrogen-Bonded Cholesteric Side-Chains

“…37 Incidentally, the discussed FT-IR-shifts due to hydrogen bonding between P4VP and CholHS are quite similar to those observed between P4VP and alkylphenols, which are also shown lead to self-assemblies but without mesogenic moieties. 13 Previously a model system of 4,4 0 -bipyridine and CholHS has been investigated, 38 and hydrogen bonding was demonstrated from FT-IR O-H 3 3 3 N bands at 2500 and 1920 cm -1 . These bands were reported to be stable up to 168°C.…”

“…32 Cholesteryl-containing compounds are common in biological materials and in synthetic materials its shape persistence in combination with chirality has encouraged to combine it in a large number of systems. [33][34][35][36][37][38][39][40][41][42] Previously it has been shown that pentadecylphenol is a particularly useful supramolecular additive, which allows selfassemblies by hydrogen bonding to pyridine containing polymers, such as poly(4-vinylpyridine) (P4VP). 13,18,43,44 Here we investigate cholesteryl hemisuccinate (CholHS) and show that it hydrogen bonds to P4VP in many respects the same way as pentadecylphenol.…”

Self-assembly and supramolecular liquid crystals based on organic cation encapsulated polyoxometalate hybrid reverse micelles and pyridine derivatives

“…3. For SEP-Si, the absorption band at 1683 cm À1 , which is assigned to C@O stretching mode, and the weak double absorption bands at 2551 and 2661 cm À1 (normally called satellite bands), which represent the formation of hydrogen-bonding, indicate that the terminal carboxylic acids exist in the intermolecular cyclic dimer state definitely [28][29][30][31]. The detailed assignments of other absorption bands are summarized in SI.…”

Synthesis and thermal properties of liquid crystal trimers comprising cyanobiphenyl and salicylaldimine anisometric segments

“…7 Thus far, three obvious kinds of trimers viz., symmetric 13,18,23 dwhere all the constituent mesogenic (A-A-A) units are identical, mixed 11,12,[14][15][16][17]21,22,[24][25][26][27] dtwo of the mesogens (A-B-A) are identical, and nonsymmetric 19,20 dnone of the mesogenic (A-B-C) units are identical, have been prepared and characterized. Seemingly, the mixed trimers, including supramolecular 28,29 systems (where the mesogenic segments are formed/ linked through the hydrogen-bond interactions) and metal-containing ones, 21 are reported in large numbers. The thermal behavior of such trimers is known to be generally dependent on the parity of the spacers as well as the molecular structures of the terminal and central mesogenic cores; these features are similar to those observed for both dimers and LC main chain polymers.…”