Hoop-shaped condensed aromatic systems: Synthesis and structure of iron- and ruthenium-hepta(organo)[60]fullerene complexes

Abstract

Potassium reduction of iron-and ruthenium-penta(organo) [60]fullerene complexes, [M(η5-C60R5)(η5- Cp)] (1a: M = Fe, R = Ph; 1b: M=Fe, R = Me; 1c: M = Ru, R = Ph; 1d: M = Ru, R = Me; Cp = C5H5) gave mono- and dianions of these complexes. Treatment of the dianion 1a with α-bromodiphenylmethane gave three different iron-hepta(organo)[60]fullerenes, [Fe{η5-C 60Ph5(CHPh2)2}(η5-Cp) ], as a mixture of regioisomers. All three compounds were fully characterized by physical methods, including X-ray crystallography and electrochemical measurements. One of the three compounds contains a new hoop-shaped condensed aromatic system. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.