Thermal Behavior of Dodecylpyridinium-Based Surfactant Salts with Varied Anionic Constituent

Abstract

Amphiphilic molecules based on pyridinium molecule attract significant attention due to their involvement in biochemical processes. Their structure with highly interactive polar head, hydrogen bonding and -stacking capabilities enables their potentional role in biotechnological and biomedical applications.Three novel dodecylpyridinium based catanionic compounds were synthesized.Combination of techniques was used to examine their thermal properties; differential scanning calorimetry powder X-ray diffraction and polarizing microscopy. Briefly, the absence of

Ionic Liquid Crystals Based on Pyridinium Salts

“…By exchanging the chloride anion with biologically active picrate, dodecylbenzenesulfonate, or cholate anions, different thermal behavior was found [19]. Thus, only the compound with dodecylbenzenesulfonate anion displayed a SmA phase stable up to 152°C, while the other two showed no liquid crystalline properties.…”

“…The hexafluorophosphate anion, PF 6 − , produced smaller mesophase ranges, followed by tetrafluoroborate anion, BF Pyridinium salts with a 1,3-dioxane ring attached in 4-position were prepared and their liquid crystalline properties were investigated [25,26]. A very wide range for the SmA mesophase (between −24 and 150°C) was found for ionic thermotropic liquid crystal system having two rings in its central core (19) reported by Haramoto et al [25]. Based on the same design, chiral pyridinium liquid crystals 20 show an interesting thermal behavior [26].…”

Influence of the Alkyl Chain Length of the Imidazole Ionic Liquid-Type Surfactants on Their Aggregation Behavior with Sodium Dodecyl Sulfate

“…To date, most of the studies on the catanionic surfactant mixtures have mainly focused on the surface and interface behavior of dilute solutions, micelles, vesicles, and so forth. − As the concentration increases, the strong interaction between the two oppositely charged surfactants usually leads to the precipitate. Therefore, there are few studies on the formation of solid-like aggregates in thicker solutions. − On the other hand, the changes of alkyl chain length will directly change the molecular structure of the surfactant, thereby affecting the arrangement and performance of the catanionic surfactants and the aggregation behavior. However, there are few studies on the effect of chain length on the aggregation behavior of catanionic surfactant mixture.…”

Mesomorphism of a new series of catanionic 4-(1-pentylheptyl)benzenesulfonates

“…These were mostly examinations of micellar and vesicular self-assembly, 1,2,[5][6][7][8][9][10][11][12] or of the formation and structure of the lamellar phase comparable with mechanisms in biological membranes, 13 while at the same time studies of their bulk solid state are relatively scarce. 3,4,[14][15][16][17][18][19][20][21][22][23][24] The structure of catanionic aggregates can be ne-tuned by tailoring the nature of the components, owing to the interplay between electrostatic effects, surfactants' molecular size and geometry, and hydrogen bonding network. Design of different complexes and tailored functionalized assemblies opens opportunities for potential applications in commercial products; from transport agents in drug and gene delivery 5 and template materials, to sensors and semiconductors, 6 information storage and nanotechnology.…”