Mössbauer, ¹³C NMR and infrared spectroscopic studies of aryliron derivatives [Fe(Ar)(Co)L(η⁵-C₅H₅)]

⁵⁷Fe Mössbauer, ¹³C{¹H} NMR and IR spectroscopic investigations have been carried out on the aryliron derivatives [Fe(Ar)(CO)L(?⁵-C₅H₅)] (L = CO, Ar = C₆H₅, C₆F₅, 2-FC₆H₄, 2-ClC₆H₄ 2-IC₆H₄, 2-CH₃C₆H₄, 2-(C₆H₅CH₂)C₆H₄ and C₆H₅CO; L = PPh₃, Ar = C₆H₅, 2-FC₆H₄). Mössbauer isomer shifts and quadrupole splittings, ¹³C NMR chemical shifts and IR ?(CO) stretching force constants are presented. These data are discussed in relation to variation of the aryl ligand, Ar, and the FeC bonds. Evidence is presented for some ortho interactions between the iron and the 2-phenyl substituent and is discussed. © 1984.