Liquid crystal behavior, photoluminescence and gas sensing: A new series of ionic liquid crystal imidazole and benzoimidazole bearing chalcone groups, synthesis and characterization

Abstract

Four new series of chalcones containing imidazole bromonium and benzimidazole bromonium salts with spacer alkyl chains (Cn, n = 2 and 4) were synthesized and their chemical structure, thermal behavior, photoluminescence and gas sensing ability were characterized.

Chalcones: Versatile intermediates in heterocyclic synthesis

“…Chalcones have already received several patents in pharmaceutical chemistry (Figure 3) [14]. Apart from their medicinal applications, they can also be used as plant growth promotors [15], sunscreen agents [16], fluorescent scaffolds [17], metal sensors [18], corrosion inhibitors [19], and liquid crystals [20]. In addition, some chalcones also show optical properties [21] and electrochemical properties [22].…”

Solid state luminescence of phosphine-EWO ligands with fluorinated chalcone skeletons and their PdX2 complexes: metal-promoted phosphorescence enhancement

“…6 Besides, there is a report on the application of chalcone-derived liquid crystals for NH 3 (g) sensing. 7…”

“…6 Besides, there is a report on the application of chalcone-derived liquid crystals for NH 3 (g) sensing. 7 Our pursuit of hemilabile ligands able to promote challenging Pd-catalysed C-C couplings (e.g. Ar F -Ar F' , Ar F = fluorinated aryl) led us to develop the family of fluorinated PEWO ligands shown in Fig.…”

“…In the free phosphine ligands, the chalcone moiety is clearly affected by the orbital influence of the R substituents at the P atom, as supported by the variations in their λ emis values (Table 1, entries 1-3). In the complexes, additional dependence on the MX 2 metal fragment at which phosphine is coordinated is obvious (Table 1, entries [4][5][6][7][8][9][10][11].…”

“…Note that the emission bands given in Table 1 are very broad and λ emis is not enough to Scheme 1 Resonance forms contributing to the electron deficiency of the CvC double bond of the chalcone fragment. 7), Pd-P = 2.3231 (7), CvC (olefin) = 1.314(4). 4L 1 : Pd-C = 1.990(4), Pd-P = 2.3388 (10), CvC (olefin) = 1.320 (6).…”