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Five naphthalene-type chalcone organogelators with different hydrophobic alkyl units, were designed and synthesized. The prepared organogelators demonstrated excellent gel properties in some selected solvents, such as cyclohexane, tert -Butanol, isooctane, and isopropanol etc. The results for thermal stability showed that the alkyl chain length attached to the chalcone also had an important influence on the gelation behavior. Under identical concentrations increasing the length of alkyl chains of the gel molecules and then the gel-to-sol transition temperature value is increased too. It has found that the hydrogen bonding between molecules, the van der Waals force and the π-π stacking provide multiple driving forces for gel self-assembly using various techniques. The morphology of the xerogel was investigated by Scanning Electron Microscope (SEM). As the length of the carbon chain increases, the dry gel tends to form a lamellar network structure. The UV–vis absorption and emission spectra of the gel molecules were also studied. [ABSTRACT FROM AUTHOR]

Oil spillage and water pollution are serious environmental disasters, which have a serious impact on the economy and ecosystem. To protect the environment，we have synthesized a new type of chalcone derivative (G1) gel. G1 can form gels in many organic solvents, fuels and edible oils. The FT-IR, SEM and XRD studies show that there are π-π stacking, Van der Waals and intermolecular H bonding force in the G1 gel self-assembly process. 3D networks structure provides a strong basis for the adsorption of dyes and the adsorption efficiency could be as high as 97.2%. The G1 can selectively gel in organic water pollutants, with recyclability. Even in the presence of salt, acid and alkali, it can be successfully used to recover spilled oil from oil-water mixture. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel bis-coumarin gelator W was first synthesized with highly selective recognition behavior for Al3+ detection. • The gelator W has good gelling properties in ethanol, tert- butanol and isopropanol. • The driving forces for gelator were: π-π stacking, hydrogen bonding and van der Waals forces. • The gelator W has low toxicity which can be used in the biological application. A novel bis-coumarin gelator W was designed and synthesized. The W has good gel behavior in ethanol, tert -butanol, and isopropanol solutions. The self-assembly mechanism of the W was investigated using techniques such as UV–Vis absorption spectroscopy, infrared spectroscopy, and XRD. The results show that the driving forces for gelation are: π-π stacking, hydrogen bonding, and van der Waals forces, respectively. The effect of solvent on the gelation behavior is analyzed in the Teas plot, which shows that the solvent and the W can only form gels under the appropriate force. Through the optical performance test, the W can specifically recognize Al3+. The detection limit is as low as 7.32 × 10−7 M, the complexation constant is Ka = 1.033 × 103M−1. In addition, the cytotoxicity test of the two cell lines shows that their toxicity is low, which indicates that the W can be used in the field of bioengineering. [ABSTRACT FROM AUTHOR]