Mossbauer spectra of tetracoordinate (phthalocyaninato)iron(II) complexes with electron-withdrawing substituents were measured. Two kinds of bonding parameters, Σ and II, were introduced for substituted phthalocyanines to interpret Mossbauer parameters in connection with the bonding characteristics of the macrocyclic ligands. They represent a- and π-bonding properties, respectively, and are defined to be larger when more electron density is placed on the iron. Calculated orders of Σ and II are in a good correlation with the sum of the Hammett a constants, Σσ, of the substituents. Several tetracoordinate (porphyrinato)iron(II) complexes were treated similarly.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry