title: Three-Ring-Based Room-Temperature Bent-Core Nematic Compounds: Synthesis and Characterization.
abstract: We report the synthesis and characterization of a new class of achiral three-ring bent-core compounds with an amide and ester linkage at the molecular bend, which are shown to exhibit nematic/phases in wide temperature ranges around room temperature (RT) and undulated SmC phases below RT. In contrast to previous studies, the compounds reported in this Communication show a true RT nematic phase with fluid physical appearance. They show strong photoluminescence in the mesophase and are found to display a one-dimensional array of intermolecular hydrogen bonding. Furthermore, the nematic phases exhibited by these compounds show a good homeotropic alignment that can be exploited in applications such as optics and sensing. Considering the scarcity of bent-core materials exhibiting an RT nematic mesophase, this new class of materials is promising.
authors.affiliation: Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali (IISERM), Sector-81, SAS Nagar, Knowledge City, Manauli-140306 (India).
authors.forename: Golam
authors.initials: G
authors.lastname: Mohiuddin
authors.affiliation: Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali (IISERM), Sector-81, SAS Nagar, Knowledge City, Manauli-140306 (India).
authors.forename: Vidhika
authors.initials: V
authors.lastname: Punjani
authors.affiliation: Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali (IISERM), Sector-81, SAS Nagar, Knowledge City, Manauli-140306 (India).
authors.forename: Santanu Kumar
authors.initials: SK
authors.lastname: Pal
keywords: bent-core materials; hydrogen bonding; nematic compounds; optical properties; photoluminescence