2002 Fiscal Year Final Research Report Summary

Supramolecular Functionalization of Carbon Nano-Cluster with π-Conjugated Host Molecules

Research Project

Project/Area Number	13450367
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Synthetic chemistry
Research Institution	The University of Tokyo
Principal Investigator	AIDA Takuzo The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (00167769)
Project Period (FY)	2001 – 2002
Keywords	Fullerene / Porphyrin / π-Conjugated System / Suplamolecule
Research Abstract	A methylrhodium(III) porphyrin cyclic dimer was found to form supramolecular oscillators with fullerene homo and hetero dimers such as C_<120> and C_<130>, where included fullerenes oscillate back and forth within the porphyrin dimer iso- and anisotropically, respectively, without dissociation. From thermodynamic analysis of the oscillation processes via simulation of VT-NMR spectral profiles of the complexes and saturation transfer experiments, these oscillations are found to be entropy-driven and retarded by the solvent-fullerene interactions. From SQUID and 2D-ESR measurements, ferromagnetic coupling of spins between paramagnetic copper porphyrin cyclic dimers and La@C_<82> was found upon complextaion of the host and guest molecules, while the dimer alone or with diamagnetic C_<60> does not show any interaction of the spins at the host molecules.