title: [60]fullerene-motivated organogel formation in a porphyrin derivative bearing programmed hydrogen-bonding sites.
abstract: A tetraphenylporphyrin (1b) bearing amide groups at the 3,5-positions of the meso-phenyl groups is assembled into a two-dimensional sheetlike structure and acts as an organogelator. When [60]fullerene was added, the sheetlike structure was dramatically changed into a one-dimensional fibrous structure, and both the gelation ability and the gel stability were improved. The stoichiometry between [60]fullerene and 1b was determined to be 1:2. Examination utilizing SEM and TEM observations, UV-vis and ATR IR spectral analyses, and XRD analysis revealed that an amide-amide hydrogen-bonding interaction creates a cavity, the size of which is complementary to that of [60]fullerene, and these cavities are connected by another amide-amide hydrogen-bonding interaction to provide a one-dimensional multicapsular structure. This is a novel example that the superstructure constructed in an organogel system is drastically changed by added [60]fullerene.
authors.affiliation: Department of Chemistry & Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 812-8581, Japan.
authors.forename: Michihiro
authors.initials: M
authors.lastname: Shirakawa
authors.forename: Norifumi
authors.initials: N
authors.lastname: Fujita
authors.forename: Seiji
authors.initials: S
authors.lastname: Shinkai