Chemische und spektroskopische untersuschungen an komplex-kationen des types [C 5H 5Fe(CO) 2(R 3EX)] +. Ein beitrag zur diskussion der koordinationseigenschaften von phosphanchalkogeniden und deren höheren homologen

Abstract

The cations [C 5H 5Fe(CO) 2(R 3EX)] + are prepared from [C 5H 2Fe(CO) 2THF] + and R 3EX (R  CH 3, i-C 3H 7, t-C 4H 9, C 6H 5, N(CH 3) 2; E  P, As, Sb; X  S, Se). NMR data indicate the ligands to be strong donors of the ylide type R 3E +-X − in the coordinated state. On the other hand, the relative donor strength E  P > Sb > As may be interpreted as a result of (X → E) π bonding.