π-Bonding and tetragonality in dchloro- and dibromo-tetrapyridinecobalt(II) and diacetylacetonatodipyridinecobalt(II)

Abstract

Average and principal magnetic susceptibilities of [Co(py)₄Cl₂], [Co(py)₄Br₂], and [Co(acetylacetone)₂(py)₂] in the temperature range 80–300 K are reported. Interpretation within the low-symmetry angular overlap model, described recently, are characterized by fits describing an approximately linear relationship between the π-bonding parameters. The indeterminacy of absolute e_π parameter values is a consequence of the high symmetry in these molecules, actual or effective. The relative contributions of π-bonding between different ligands and with respect to different directions all appear compatible with otherwise established chemical criteria.