Bolaamphiphilic liquid crystals based on bis-imidazolium cations

Abstract

Rare examples of bolaform ionic materials containing cyanometallates and their lamellar mesomorphic supramolecular architectures are characterized.

Engineering On‐Surface Spin Crossover: Spin‐State Switching in a Self‐Assembled Film of Vacuum‐Sublimable Functional Molecule

“…Beyond the information directly extracted from the XRD patterns, the common lamellar structure of bulk sample and film can be scrutinized using a geometrical analysis . To do so, the geometrical features of the [Fe(H 2 B(pz) 2 ) 2 (C 12 ‐bpy)] complex have been modeled by extracting the density and crystallographic data of the constituent molecular entities, the [Fe(H 2 B(pz) 2 ) 2 (bpy)] SCO head and the dodecyl carboxylate tail, and compared with the molecular area A mol of the layer sequence, defined as the ratio of molecular volume V mol to lamellar thickness d .…”

Synthesis and Structure of Cyanomethyltriphenylphosphonium Dicyanoaurate and Benzyltriphenylphosphonium Dicyanoargentate

“…Специфическое строение дицианоаргентатных анионов, способствующее образованию олигомеров, приводит к проявлению магнитной активности дицианоаргентатных комплексов [13]. Кроме того, комплексы с анионами [Ag(CN)2] − перспективны в плане создания новых нанои жидкокристаллических систем [14,15]. С точки зрения поиска структур, обладающих ценными физико-химическими свойствами, перспективным является варьирование катионной части дицианоаргентатных комплексов [16].…”

Inspection of Thermodynamic Behaviors in Binary Mixtures of a Double Chain Ionic Liquid Crystal with a Thermotropic Liquid Crystal

“…One of the most intriguing liquid crystal materials which mainly consists of cations and anions is ionic liquid crystals (ILCs), while the first ILCs have been identified in 1938, but over the last 2 decades, this field has undergone a revolutionary change, mainly due to a voracious interest of researchers to ionic liquids (ILs) . Integrating features of liquid crystals (LCs) such as dynamic molecular order and self-assembling capacity with some benefits of ILs can successfully yield the thermotropic ILCs which also have advantages of good ionic conductivity. − A relatively new trend in LCs is the use of ionic self-assembly techniques to obtain ILCs. − ILCs are typically generated by typical ILs, which contain a large and heavy cation (or anion) with either a long alkyl chain or an inflexible mesogenic unit either via hydrophilic/-phobic interactions between charged ionic sides and long alkyl chain pendants from the cation or steric interactions between mesogenic units . However, ILCs vary from ILs, showing at least one LC mesophase (enantiotropic or monotropic), as well as cations and anions .…”

“…5−7 ILCs are typically generated by typical ILs, which contain a large and heavy cation (or anion) with either a long alkyl chain or an inflexible mesogenic unit either via hydrophilic/-phobic interactions between charged ionic sides and long alkyl chain pendants from the cation or steric interactions between mesogenic units. 8 However, ILCs vary from ILs, showing at least one LC mesophase (enantiotropic or monotropic), as well as cations and anions. 6 Because the synthesis and substitution of the cationic part of ILCs are easier than those of the anionic part, thus, for obtaining a mesomorphic salt, a lot of organic cations such as imidazolium, 9 pyridinium, 10,11 phosphonium, 12 pyrrolidinium, 13 piperidinium, 14 guanidinium, 15 triazolium, 16 quinolinium, 17 ammonium salts, and halide anions (chloride, bromide, or iodide anions) have been used.…”