| 초록 |
We synthesized porphyrin derivatives bearing four alkyl chain (CnH2n+1, n=2, 5, 8, and 11) at meso-position. All porphyrin molecules were fully characterized by using 1H NMR, UV-Vis spectroscopy, and MALDI-TOF-MS. The 2D character of porphyrin molecule with 22π-electrons enables strong interaction, facilitating the formation of one-dimensional nanostrucutures such as J-and H-aggregates via side-by-side and face-to-face stacking, respectively. We report on the formation of supramolecular H-aggregates of alkyl-appended porphyrins in hexane. Actually, nonpolar solvent such as n-hexane that is good solvent for alkyl side chains and a poor solvent for porphyrin π-system. Interestingly, conformational transition of the mixture of porphyrin derivatives with DABCO (1,4-diazabicyclo[2.2.2]octane) undergone from random phase in polar solvent to a more ordered aggregate in nonpolar solvent in order to decrease the unfavorable interaction between the solvent and aromatic main moiety. |
