125918-82-3Relevant academic research and scientific papers
Preparation and Spectroscopic Characterization of trans-Fe(CO)3L1L2 (L1, L2 = Phosphine or Phosphite)
Inoue, Hidenari,Kuroiwa, Takeshi,Shirai, Tsuneo,Fluck, Ekkehard
, p. 641 - 646 (2007/10/02)
The 57Fe Moessbauer spectra of mixed ligand complexes of the type trans-Fe(CO)3L1L2 (L1 = triphenylphosphine or triphenylphosphite and L2 = phosphine or phosphite) show a quadrupolesplitting doublet typical of the disubstituted iron carbonyls in trigonal bipyramidal symmetry.The inverse linear dependence of the isomer shifts on the CO stretching frequencies is interpreted on the basis of the strengthening triple-bond nature of the carbonyl ligands with increasing iron-to-phosphorus ?-back donation.A linear correlation, with a positive slope, between the isomer shifts and the quadrupole splittings has revealed that the phosphorus-to-iron ?-donation is offset by the iron-to-phosphorus ?-back donation.A corrlation between the coordination shifts and the isomer shifts demonstrates that the iron-to-phosphorus ?-back donation plays an important role in the Fe-P bond.The relatively large coupling constant of 2J(P,P) reflects a strong interaction between trans-phosphorus ligands through the P-Fe-P bond. - keywords: (Phosphine/Phosphite)tricarbonyliron, Moessbauer Spectra, IR Spectra, 31P NMR Spectra
