The Effect of Solution Conditions on the Driving Forces for Self-Assembly of a Pyrene Molecule

作者：Shi, Shaowei; Liu, Dapeng; Wang, Xiaosong^*

来源：Chemistry - A European Journal, 2017, 23(41): 9736-9740.

DOI：10.1002/chem.201702281

• driving force
• morphology
• pi interactions
• pyrenes
• self-assembly

Fe(CO){CO(CH2)(5)CH2-pyrene}(Cp)(PPh3) ( Fppyrene) is soluble in DMSO and THF, but insoluble in water, methanol, and ethanol. The hydrophobic force drives the molecules' assembly into vesicles in THF/water. The pi-pi interaction of the pyrene groups subsequently occurred within the vesicular membrane. The assembly, however, is driven by the pi-pi interaction in DMSO/water (water content: 40-80 vol%) into membranes, which is attributed to the relatively higher degree of de-solvation (delta) of pyrene in DMSO. Further increase in delta(DMSO/90 vol% water) suppresses the p-p interaction and spherical particles are formed. On the other hand, the supersaturated solutions were prepared via a cycle of heating and cooling of Fp-pyrene in methanol or ethanol. Fp-pyrene aggregates into particles without the pi-pi interaction in the solutions with a lower degree of supersaturation (sigma). In contrast, a higher s induces the pi-pi interaction, which drives the assembly into nanotapes. The pi-pi interaction is a conditional effect depending on the solution conditions, which can be adjusted for the synthesis of nanostructures assembled from the same aromatic molecule.

• 出版日期2017-7-21
• 单位北京化工大学