Structure-property relationships for the thermal phase behavior of discotic liquid crystals: the effect of branching and unsaturation in the side chains of disklike molecules

Desymmetrization of 3,3′‐Bis(acylamino)‐2,2′‐bipyridine‐Based Discotics: The High Fidelity of Their Self‐Assembly Behavior in the Liquid‐Crystalline State and in Solution

“…The absence of a melting point is probably due to the presence of branched side tails in compound 1 that will lower the melting point. [40] The isotropic transitions of both discs 2 and 3 are lower than that of related nonpolar discotics A (Figure 1a), which is in agreement with other reported desymmetrized systems. [41] All discussed phases in discotics 1 and 2 are enantiotropic and little hysteresis was observed for the LC-LC transitions at approximately 200 8C for both 1 and 2 and for the Cr-LC transition of discotic 2 (see Figures S2 and S3 of the Supporting Information for the DSC plots).…”

Symmetrical and Nonsymmetrical Liquid Crystalline Oligothiophenes: Convenient Synthesis and Transition‐Temperature Engineering

“…The transition between the crystalline (Cr) and liquid crystalline (LC) phases involves the conformational disordering of the side chains, also referred to as "side-chain melting". [8] In agreement with this simple model, symmetrical 5,5ЈЈ-bis(n-alkyl)terthiophenes with six to nine carbon atoms in the alkyl chain demonstrate increasing Cr-LC transition temperatures with increasing chain length, [3,9] i.e., the same tendency as that of the melting points of linear alkanes. On the other hand, it has been well documented that branching of peripheral substituents results in the lowering of the Cr-LC transition temperatures of discotic mesogens.…”

“…On the other hand, it has been well documented that branching of peripheral substituents results in the lowering of the Cr-LC transition temperatures of discotic mesogens. [8,10] Here, we explore two different possibilities of tuning the transition temperature in liquid crystalline terthiophenes and quaterthiophenes: substitution at the aromatic core with two identical branched alkyl chains and desymmetrization of the molecule with two alkyl substituents of different length or structure.…”

Supramolecular Polymers

“…Hydrogen bonding in combination with π-stacking interactions have been used to induce a high degree of order in self-assembled systems. For example, tubular polymeric structures were presented by Gottarelli et al 21 They have shown the formation of chiral polymeric columns based on deoxyguanosine in water. These columns consist of stacked discs, which are formed by the association of four guanosine derivatives via hydrogen bonds.…”