Anthony M. White

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

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 eπ 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.