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5246531 
Journal Article 
The eta(2) Complex of Nickel Bis(diphenylphosphanyl)propane with Fullerene: {Ni(dppp)(eta(2)-C(60))}center dot(Solvent) Obtained by Reduction 
Konarev, DV; Khasanov, SS; Yudanova, EI; Lyubovskaya, RN 
2011 
Yes 
European Journal of Inorganic Chemistry
ISSN: 1434-1948
EISSN: 1099-0682 
WILEY-BLACKWELL 
MALDEN 
6 
816-820 
English 
WOS:000287764900006 
The eta(2) complex of nickel bis(diphenylphosphanyl) propane with fullerene, {Ni(dppp)(eta(2)-C(60))}center dot(C(6)H(14))(0.84)center dot(C(6)H(4)Cl(2))(0.16) (1) (C(6)H(14): hexane, C(6)H(4)Cl(2): o-dichlorobenzene), has been obtained by reduction of the Ni(dppp) Cl(2) and C(60) mixture with sodium fluorenone in o-dichlorobenzene and slow precipitation of the single crystals by diffusion of hexane. Nickel coordinates to the 6-6 bond of C(60) by eta(2)-coordination to form Ni-C(C(60)) bonds with a length of 1.948-1.951(2) angstrom, which are the shortest M-C bonds among known eta(2) complexes of fullerenes. The 6-6 bond length [1.488(3) angstrom] where the Ni atom is coordinated is noticeably longer than the average length of other 6-6 bonds in C(60) [1.388(2) angstrom]. Coordination of nickel to C(60) results in the splitting of two bands for two IR-active modes of C(60) into three bands, because of the lower symmetry of C(60), and a noticeable shift in the F(1u)(4) mode of C(60) to lower frequencies, as a result of pi back-donation. The dark green complex manifests two absorption bands at 664 and 890 nm in the visible range. The complex is EPR silent since only a weak narrow signal with g = 2.0000 and Delta H = 0.17 mT was found in the EPR spectrum of 1 at room temperature, which originates from about 0.1% of spins of the total amount of C(60). 
Chemistry; Fullerenes, Nickel, Crystal growth, Solid-state structures, IR; spectroscopy, UV, Vis spectroscopy, Layered compounds; transition-metal-complexes, buckminsterfullerene c-60,; crystal-structure, derivatives, c-70, anions, dimers, films, c-84, c60