| 초록 |
1H-imidazole amphiphiles having imidazole head group of hydrophilic region and aliphatic chain of hydrophobic part were synthesized. Thermal properties and mesomorphic behaviors of the compounds were investigated by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). These compounds showed enatiotropic mesophases. Also, these showed lyotropic properties in n-alkane solvents as well as thermotropic. In the results of X-ray analysis, they existed in a dimer form with hydrogen bonding between imidazole moieties, having well defined columnar hexagonal and optically isotropic cubic structures. Solubility test of the compounds was performed in various solvents. They exhibited marked solubility in non-polar solvents such as hydrocarbons and low polar solvents including MC, CDCl3. They were not soluble, however, in polar protic solvents such as methanol, H2O and polar aprotic solvents such as DMF, DMSO. Micellization of compounds was investigated by 1H NMR spectroscopy in cyclohexane solvent at various temperatures. To further shed light into the self-assembly behavior of 1H-imidazole amphiphiles, UV/vis and fluorescence experiments in n-hexane or cyclohexane were performed at room temperature. As increasing the concentration, a gradually bathocromic shift from λmax = 337 to 403 nm in cyclohexane and from λmax = 347 to 435 nm in n-hexane was observed. |
