Synthesis and characterization of bis-triruthenium cluster derivatives of an all equatorial [60]fullerene tetramalonate

Abstract

The reaction of the tetrakis[di(ethoxycarbonyl)methano]-C60 (1) with Ru3(CO)12 afforded the first bis-parallel C60-metal cluster complex: parallel-[Ru3(CO)9]2{μ3-η(2),η(2),η(2)-C60[C(COOC2H5)2]4}. The two triruthenium groups are found in either a parallel or a tilted orientation relative to each other, as determined by NMR. Only the parallel form was characterized by X-ray crystallography.

Coordination chemistry on carbon surfaces

“…The most stable adsorption site of a single Pt atom is the B-site. The stable atomic [521] configuration of the Pt 2 is on the B-sites as well as for Pt 3 , which prefers a linear configuration, the Pt atoms are located on the B-sites and E form is 3.6 eV/atom. For Pt 4 clusters, tetrahedral configuration is the most stable among the three considered.…”

Exohedral Cuprofullerene: Sequentially Expanding Metal Olefin Up to a C60@Cu24 Rhombicuboctahedron

“…As a spherical polyene system, the 30 CC bonds in C 60 provide an incredible possibility to bind 30 metal atoms in a saturated μ 30 -(η 2 ) 30 fashion to complete a C 60 @ M 30 icosi­dodecahedron with 20 vertex-shared M 3 -trigons (Scheme b). Up to now, the highest nuclearity is 6 in the reported exohedral metallo­fullerenes, such as 6:1 products through six η 2 or η 2 /η 5 interactions, − and 2:1 adducts through double (μ 3 -η 2 :η 2 :η 2 ) interactions. , It seems an impassable task to fulfill the saturated fashion using open-shell metals, because these metals show coordination numbers no less than 4, and the bulky steric crowding caused by the multiple auxiliary ligands will prevent more M 3 being coated on the neighbor hexagons and restrict the number of M 3 on the C 60 surface, in spite of numerous examples of (μ 3 -η 2 :η 2 :η 2 )-metallo­fullerenes . Therefore, minimizing the steric crowding surrounding the M 3 , for example, adopting the closed-shell Cu­(I) with low coordination number (no more than 4), and using anionic bridge ligands but not terminal ligands are believed to be effective strategies to achieve a high nuclear metallo­fullerene.…”

Recent progress in the synthesis of regio‐isomerically pure bis‐adducts of empty and endohedral fullerenes

“…b). This topologically controlled bis ‐addition reaction is completely specific, and no other isomers are obtained for either C 60 or C 70 and the products can be used to further functionalize these fullerenes regioselectively, using what Prof. Kräutler has described as orthogonal transposition, where other groups are added to the bis ‐adducts, followed by thermal retro Diels–Alder of the anthracenes to afford compounds that are otherwise very difficult, if not impossible, to prepare in large quantities without observing multiple isomeric forms …”