Helical Nano-crystallite (HNC) Phases: Chirality Synchronization of Achiral Bent-Core Mesogens in a New Type of Dark Conglomerates was written by Alaasar, Mohamed;Prehm, Marko;Tschierske, Carsten. And the article was included in Chemistry – A European Journal in 2016.Synthetic Route of C6H5ClO2 The following contents are mentioned in the article:
Spontaneous generation of macroscopic homochirality in soft matter systems by self-assembly of exclusively achiral mols. under achiral conditions is a challenging task with relevance for fundamental scientific research and technol. applications. Dark conglomerate phases (DC phases), being optically isotropic mesophases composed of conglomerates of macroscopic chiral domains and formed by some non-chiral bent-core mesogens, represent such a case. Here we report two new series of non-sym. bent-core mols. capable of forming a new type of mirror symmetry broken DC phases. In the synthesized mols., a bent 4-bromoresorcinol core is connected to a Ph benzoate wing and an azobenzene wing with or without addnl. peripheral fluorine substitution. The self-assembly was investigated by DSC, polarizing microscopy, electro-optical studies and XRD. Chiral and apparently achiral DC phases were observed besides distinct types of lamellar liquid crystalline phases with different degree of polar order, allowing the investigation of the transition from smectic to DC phases. This indicates a process in which increased packing d. at first gives rise to restricted rotation and thus to growing polar order, which then leads to chirality synchronization, layer frustration and nano-scale crystallization Topol. constraints arising from the twisted packing of helical conformers in lamellar crystals is proposed to lead to amorphous solids composed of helical nano-crystallites with short coherence length (HNC phases). This is considered as a third major type of DC phases, distinct from the previously known liquid crystalline sponge phases and the helical nano-filament phases (HNF phases). Guidelines for the mol. design of new materials capable of self-assembly into these three types of DC phases are proposed. This study involved multiple reactions and reactants, such as 4-Chlororesorcinol (cas: 95-88-5Synthetic Route of C6H5ClO2).
4-Chlororesorcinol (cas: 95-88-5) belongs to organic chlorides. Organochlorines stimulate the central nervous system and cause convulsions, tremor, nausea, and mental confusion. Examples are dichlorodiphenyltrichloroethane (DDT), chlordane, lindane, endosulfan, and dieldrin. Aliphatic organochlorides are often alkylating agents as chlorine can act as a leaving group, which can result in cellular damage.Synthetic Route of C6H5ClO2
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics