Substitution　reactions　of　the　quinolyl-functionalized　hydrogenase　model　complexes　[(mu-SCH2C9H6N)(2)Fe-2(CO)(6)]　(1)　or　[(mu-SCH2C9H6N)(mu-SCH2C9H6N-eta)Fe-2(CO)(5)]　(2)　by　triphenylphosphine　(PPh3),　bis　(diphenylphosphino)　methane　(dppm)　and　trimethylphosphine　(PMe3)　have　been　investigated.　These　reactions　produced　either　the　mono-substituted　complexes　[(mu-SCH2C9H5N)(2)Fe-2(CO)(5)(PPh3)]　(3),　[(mu-SCH2C9H6N)(2)Fe-2(CO)(5)(dppm)]　(4),　or　the　disubstituted　one　[(mu-SCH2C9H6N)(2)Fe-2(CO)(4)(PMe3)(2)]　(5).　The　three　new　phosphine　substituted　derivatives　have　been　fully　characterized　by　elemental　analysis,　mass　spectrometry,　IR,　H-1　and　P-31　NMR　spectroscopic　techniques.　The　molecular　structures　of　3-4　were　further　confirmed　by　single　crystal　X-ray　diffraction　analysis.　The　electrochemical　behavior　of　1-5　were　investigated　by　cyclic　voltammetry.　The　protonation　study　of　complex　5　with　HBF4　center　dot　OEt2　was　also　investigated　by　IR　and　low　temperature　NMR.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.