title: A ruthenium bridge in fullerene-ferrocene arrays: synthesis of [Ru(C60Me5)R(CO)2] (R=C6H4Fc, C identical withCFc) and their charge-transfer properties.
abstract: New fullerene-ferrocene arrays, [Ru(C(60)Me(5))(C(4)H(6)Fc)(CO)(2)] (Fc=ferrocenyl) and [Ru(C(60)Me(5))(CCFc)(CO)(2)], in which the ruthenium complex functions as a conjugative bridge, were synthesized by the reaction of [Ru(C(60)Me(5))Cl(CO)(2)] with FcC(6)H(4)MgBr and FcCCLi, respectively. These compounds were investigated by electrochemical measurement, single-crystal X-ray structural analysis, and photophysical measurement. Upon photoirradiation, the former compound was converted rapidly into the corresponding triplet state in toluene (tau(singlet)=21 ps), whereas the charge-separated state was predominant in THF (tau(singlet)=10.5 ps; tau(CS)=355 ps). The latter compound, on the other hand, formed the charge-separated state in both toluene and THF (tau(singlet)=3.0 ps; tau(CS)=152 ps). Thus, the structural difference between the phenylene and acetylene bridges in 1 and 2, respectively, was found to change the outcome of the photophysical processes.
authors.affiliation: Nakamura Functional Carbon Cluster Project, ERATO, Japan Science and Technology Agency, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan. matsuo@chem.s.u-tokyo.ac.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Matsuo
authors.forename: Keiko
authors.initials: K
authors.lastname: Matsuo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nanao
authors.forename: Renata
authors.initials: R
authors.lastname: Marczak
authors.forename: S Shankara
authors.initials: SS
authors.lastname: Gayathri
authors.forename: Dirk M
authors.initials: DM
authors.lastname: Guldi
authors.forename: Eiichi
authors.initials: E
authors.lastname: Nakamura
mesh_terms: D005296:Ferrous Compounds / Q000737:chemistry*; D005453:Fluorescence; D037741:Fullerenes / Q000737:chemistry*; D000075163:Metallocenes; D008958:Models, Molecular; D015394:Molecular Structure; D010777:Photochemistry; D012428:Ruthenium / Q000737:chemistry*; D017975:Ruthenium Compounds / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D037741:Fullerenes; D000075163:Metallocenes; D017975:Ruthenium Compounds; D012428:Ruthenium; C004998:ferrocene