Heterobimetallic　Ru-Fe　complex　trans-RuCl(dppm)(2)(CdropCFc)　(1)　(Fc　=　C5H4FeC5H5,　dppm　=　(C6H5)(2)PCH2P　(C6H5)(2))　was　functionalized　to　give　Ru　(dppm)(2)　(C　drop　CFc)　(C　drop　CPhOCH3)　(2),　[Ru(dppm)(2)(CdropCFc)(NdropCCH(2)CH(2)NH(2))][PF6]　(3)　and　[Ru(dppm)(2)(CdropCFc)(NdropCCH(2)CH(2)NHcircleC(O)(CH2)(10)SH)][PF6]　(4)　for　surface　binding.　Cyclic　voltametric　techniques　were　performed　on　these　complexes　to　study　the　extent　of　perturbation　of　the　surface　binding　＂tail＂　on　the　overall　electrochemical　peroperties.　It　is　found　that　the　substituent　on　the　Ru　center　adjusts　the　electron　density　on　the　Ru　atom　and　affects　the　redox　properties　of　the　Ru　center.　However,　this　substituent　effect　is　not　transferred　through　the　acetylene　bond　to　the　ferrocenyl　moiety.　Complex　4　forms　a　stable　and　order　SAM　on　the　Au　surface　and　CV　was　used　to　study　the　film　growth　and　surface　coverage.