title: Phosphorus-containing chiral molecule for fullerene recognition based on concave/convex interaction.
abstract: A C3-symmetric chiral concave molecule having a phosphorus atom at the center was synthesized, and its enantiomers were resolved. The chiral concave shape and absolute structure of the concave molecules were revealed by X-ray analysis. The concave molecule exhibited intense chiroptical properties with a large anisotropy, which was derived from molecular orbitals delocalized to the side chains. In the co-crystal with pristine C60, four of the enantiopure concave molecules perfectly wrapped the surface of C60. MALDI-TOF mass, NMR, and circular dichromism spectra also supported the concave/convex interaction between the concave molecule and fullerene. These results suggest that the phosphorus-containing molecule with a concave shape plays an important role as a chiral host molecule for C60.
authors.affiliation: Graduate School of Pure and Applied Sciences and Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba , 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Yamamura
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Saito
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Nabeshima