Abstract

The synthesis of four ferrocenylphosphine-amino acid ligands, (S)-(eta(5)-C5H4-PR2)Fe(eta(5)-C5H4-AA) [R= Ph, AA= l-Glu(OMe)(2): 5a'; R= Cy, AA= l-Glu(OMe)(2): 5b'; R= Ph, AA= l-Pro(OMe): 5a''; R= Cy, AA= l-Pro(OMe): 5b''] through a new synthetic method is presented along with two solid-state X-ray crystal structures of the corresponding phosphine selenides 5a''(Se) and 5b''(Se). Electronic and basicity properties of the ligands were evaluated through the synthesis of the corresponding phosphine selenides 5a'(Se) - 5b''(Se). Coordination capabilities of the ferrocenylphosphine-amino acid ligands with the p-cymene ruthenium dichloride dimer was evaluated, affording four neutral complexes, RuCl2(eta(6)-C10H14){PR2-[(eta(5)-C5H4)Fe(eta(5)-C5H4-AA)]} [R= Ph, AA= l-Glu(OMe)(2): 6a'; R= Cy, AA= l-Glu(OMe)(2): 6b'; R= Ph, AA= l-Pro(OMe): 6a''; R= Cy, AA= l-Pro(OMe): 6b''] and three cationic complexes < RuCl(NCMe)(eta(6)-C10H14){PR2-[(eta(5)-C5H4)Fe(eta(5)-C5H4-AA)]}> SbF6 [R= Ph, AA= l-Glu(OMe)(2): 7a'; R= Ph, AA= l-Pro(OMe): 7a''; R= Cy, AA= l-Pro(OMe): 7b'']. All new ligands and complexes were fully characterized by NMR spectroscopy, electrospray ionization mass spectrometry and their electrochemical properties were measured by cyclic voltammetry at a platinum disk electrode.