A series of arene-ruthenium complexes of the general formula [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 2 R}L] with R=OH, CH 2 OH, OC(O)Fc, CH 2 OC(O)Fc (Fc=ferrocenyl) and L=PPh 3 , (diphenylphosphino)ferrocene, or bridging 1,1 ' -bis(diphenylphosphino)ferrocene, have been synthesized. Two synthetic pathways have been used for these ferrocene-modified arene-ruthenium complexes: (a) esterification of ferrocene carboxylic acid with 2-(cyclohexa-1,4-dienyl)ethanol, followed by condensation with RuCl 3 .nH 2 O to afford [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 2 OC(O)Fc}] 2 , and (b) esterification between ferrocene carboxylic acid and [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 3 OH}L] to give [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 3 OC(O)Fc}L]. All new compounds have been characterized by NMR and IR spectroscopy as well as by mass spectrometry. The single-crystal X-ray structure analysis of [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 3 OH}(PPh 3 )] shows that the presence of a CH 2 CH 2 CH 2 OH side-arm allows [RuCl 2 {η 6 -C 6 H 5 (CH 2 ) 3 OH}(PPh 3 )] to form an intramolecular hydrogen bond with a chlorine atom. The electrochemical behavior of selected representative compounds has been studied. Complexes with ferrocenylated side arms display the expected cyclic voltammograms, two independent reversible one-electron waves of the Ru(II)/Ru(III) and Fe(II)/Fe(III) redox couples. Introduction of a ferrocenylphosphine onto the ruthenium is reflected by an additonal reversible, one-electron wave due to ferrocene/ferrocenium system which is, however, coupled with the Ru(II)/Ru(III) redox system.