Interconversion between µ-eta(2),eta(2)-C(60) and µ(3)-eta(2),eta(2),eta(2)-C(60) on a Carbido Pentaosmium Cluster Framework We are grateful to the Korea Science Engineering Foundation (KOSEF) for financial support (project no. 1999-1-122-001-5) of this research and a postdoctoral fellowship to K.L. The X-ray diffraction studies were carried out at the X-ray Crystallographic Laboratory of Yonsei University, which was supported in part by KOSEF

Regioisomeric core-shell cuprofullerene C60@Cu24

The controlled synthesis of high-nuclear regioisomeric core-shell exohedral metallofullerenes (ExMFs) is challenging. Herein, we demonstrated the synthesis of regioisomeric core-shell cuprofullerene C₆₀@Cu^I₂₄ and its 3-D coordination polymer using heteroleptic ligands, realizing high-nuclear regioisomeric ExMFs and a polymeric ExMF structure.

PERIODIC FULLEROIDS

Construction of periodic fulleroids (including covering polygons other than the classical pentagons and hexagons) is achieved by several coupling procedures. A constitutive typing enumeration for topologically periodic fulleroids is given. π-electronic periodicity of several series of tubulenes is rationalized in terms of some "rules of thumb". The strain energy of these nonplanar molecules was evaluated from the pyramidalization angles of the sp2 carbon atoms by the POAV1 procedure. Semiempirical PM3 calculations support the presented spectral data.

Two Metal Centers Bridging Two C60 Cages as a Wide Passage for Efficient Interfullerene Electronic Interaction

The reaction of Ir4(CO)8(PMe3)4 with excess C60 in refluxing 1,2-dichlorobenzene, followed by treatment by CNR (R = CH2C6H5) at 70 degrees C, affords a fullerene-metal sandwich complex Ir4(CO)3(mu4-CH)(PMe3)2(mu-PMe2)(CNR)(mu-eta2,eta2-C60)(mu4-eta1,eta1,eta2,eta2-C60) (1), which exhibits an interesting structural feature of two metal atoms bridging the two C60 centers as well as the first example of a mu4-eta1,eta1,eta2,eta2-C60 bonding mode. Compound 1 has been characterized by NMR spectroscopy, elemental analysis, and X-ray diffraction study. A cyclic voltammetry study reveals strong electronic communication between the two C60 centers in 1, which is due to the presence of a wide channel of two metal centers between the two C60 cages for efficient electronic interaction.

The first fullerene-metal sandwich complex: an unusually strong electronic communication between two C(60) cages

Reaction of Rh(6)(CO)(9)(dppm)(2)(mu(3)-eta(2),eta(2),eta(2)-C(60)) (1) with C(60) in refluxing chlorobenzene followed by treatment with CNR (R = CH(2)C(6)H(5)) at room temperature affords the first fullerene-metal sandwich complex Rh(6)(CO)(5)(dppm)(2)(CNR)(mu(3)-eta(2),eta(2),eta(2)-C(60))(2) (2). Compound 2 has been characterized by an X-ray diffraction study. Electrochemical study of 2 reveals six well-separated reversible redox couples localized at C(60) cages due to a strong electronic communication between the two C(60) centers via the Rh(6) cluster spacer.