Double donation in trigonal planar iron–carbodiphosphorane complexes – a concise study on their spectroscopic and electronic properties
Nis‐Julian H. Kneusels, Jörn E. Münzer, Kimon Flosdorf, Dandan Jiang, B. Neumüller, Lili Zhao, Andreas Eichhöfer, Gernot Frenking, Istemi Kuzu
Abstract
We present the syntheses of trigonal planar coordinated Fe(ii) carbodiphosphorane (CDPR) complexes, starting from iron(ii)-bis(trimethylsilylamide) [Fe{N(SiMe3)2}2] and hexaphenyl-(CDPPh) and sym-dimethyltetraphenyl-carbodiphosphoranes (CDPMe), respectively. Both complexes [CDPPh-Fe{N(SiMe3)2}2] (1) and [CDPMe-Fe{N(SiMe3)2}2] (2) were examined in solution and in the solid state. 1 shows a dissociation equilibrium in solution which we monitored by variable temperature 1H-NMR spectroscopy. Magnetic measurements of 1 and 2 yielded a high spin configuration (S = 2) for both complexes. Quantum chemical calculations were performed to analyze the bonding situation in compound 1.