Investigation of geling properties of izolösin derivative tetraamide compounds

The gelation of low molecular weight organic compounds has recently been of interest. Gels are viscoelastic substances similar to liquids or solids. The main driving forces in the self-assembly of gelators are; hydrogen bonding , π- π aggregation, van der Waals interactions, coordination gradients, charge transfer interactions and so on intermolecular non-covalent interactions. These non-covalent interactions result in the formation of supramolecular structures with nano cavities. Subsequently, gels are formed by trapping liquid into the nano spaces in this structure. In addition to contact lenses in daily life, it is among the most useful systems with potential applications in cosmetic industry, hair gels, toothpastes, shampoos and soaps, controlled drug release, sensors, food production, photography, dye removal and tissue engineering. Low molar mass gelators exhibit thermaly reversible behavior. Therefore, these gelators were not only academically interested, but more importantly, they were of special interest due to their practical applications. For example, studies on the use of low mole mass gelators in the disposal of crude oil and domestic kitchen oil wastes poured into the sea are available in the literatüre. In this study, two low molecular mass tetraamide compounds synthesized from L-isoleucine were selected as organogelators. Fatty acid esters of different chain lengths such as ethly laurate, ethly myristate, ethly palmitate, isopropyl laurate, isopropyl myristate and isopropyl palmitate which are used in the pharmaceutial and cosmetic industries as gelling liquids. In addition, xylene, anisole, liquid paraffin, n-dodecane, 1-decanol, diethylene glycol and toluene have been selected as common organic solvents. It was examined whether the organojelators were gelled with these liquids and minimum gelling concentrations were determined. Tg values of the gels were determined and ΔHg values of gelling enthalpy were obtained from van’t Hoff correlation.