Diiron complexes with bridging hydrocarbyl ligands and containing CO and Cp ligands (Cp = η 5 -C 5 H 5 ) have been investigated as possible electrocatalysts for H 2 production. In particular, studies included the vinyliminium complexes [Fe 2 {μ-η 1 :η 3 -C(R′)=CRCNMe 2 }(μ-CO)(CO)-(Cp) 2 ][SO 3 CF 3 ] (R′ = Tol (4-MeC 6 H 4 ), R = H, 1a; R′ = CH 2 OH, R = H, 1b; R′ = CH 2 OH, R = SPh, 1c), the vinylalkylidene [Fe 2 {μ-η 1 :η 3 -C(Tol)CHCHNMe 2 }(μ-CO)(CO)(Cp) 2 ] (2), the aminoalkylidyne [Fe 2 {μ-CN(Me)(R)}(μ-CO)(CO)(L)(Cp) 2 ][SO 3 CF 3 ] (R = Me, L = CO, 3a; R = Me, L = NCMe, 3b; R = Xyl (2,6-Me 2 C 6 H 3 ), L = CO, 3c), [Fe 2 {μ-CN(Me) 2 }(μ-L′)(CO)(L)(Cp) 2 ] (L′ = CO, L = CN, 4; L′ = H, L = CO, 5), the thiocarbyne complexes [Fe 2 (μ-CSEt)(μ-CO)(CO) 2 (Cp) 2 ][BF 4 ], (6) and [Fe 2 (μ-CSMe)(μ-CO)(CO)(CN)(Cp) 2 ] (7), and the alkylidene complexes [Fe 2 {μ-C(CN)(SMe)}(μ-CO)(CO) 2 (Cp) 2 ][SO 3 CF 3 ] (8) and [Fe 2 {μ-C(CN)(PMe 2 Ph)}(μ-CO)(CO) 2 (Cp) 2 ][SO 3 CF 3 ] (9).Cyclic voltammograms (CV) of the above complexes in CH 3 CN have been recorded in the presence of increasing amounts of acetic acid to evidence electrocatalytic proton reduction. In spite of the fact that the above diiron complexes do not resemble the typical diiron dithiolate model systems, the aminocarbyne 4 and the thiocarbyne complex 7 exhibit significant electrocatalytic properties for proton reduction (e.g., for 4, the turnover number (TON) is 15.5).
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