Reactions of a terminal phosphido-group in an organoiron complex. Part III. Complexes containing two metal atoms with a single phosphido-bridge

Abstract

The phosphido-complex [Fe(cp)(CO)₂{P(CF₃)₂}](L)(cp =η-cyclopentadienyl) acts as a Lewis base towards metal carbonyls and nitrosyls, forming the monosubstituted complexes [Ni(CO)₃L], [Co(CO)₂(NO)L], [Fe(CO)(NO)₂L], [Fe(CO)₄L], [Mn(CO)₃(NO)L], and trans-[Mn(CO)₄(H)L]. With [Co₂(CO)₈], (L) forms the tetranuclear complex [Co₂(CO)₆L₂]. I.r. studies suggest that the donor–acceptor ability of (L) is intermediate between that of triarylphosphines and trialkyl phosphites. In the i.r. spectra, [Co(CO)₂(NO)L] and [Mn(CO)₃(NO)L] show more than one ν(NO) band and additional ν(CO) bands compared to the other complexes, the presence of which is attributed to rotational isomerism about the P–Co and P–Mn bond respectively.