In this work, the synthesis, characterization, and electronic properties of a series of unusually square planar bis(imino)pyridine ligated AlIII and GaIII complexes will be described. Generation of the 5-coordinate, square pyramidal solvate adduct shows that the complex changes from a delocalized π-electronic system to π-conjugation. 1H NMR studies demonstrate that the p-pyridyl proton resonance lies in an unambiguous region in the 1H NMR spectrum and experiences a range of chemical shifts depending on the solvent molecule employed. Correlation of the chemical shift to the donicity of the solvent employed affords a linear correlation that can be extrapolated to the chemical shift of the four-coordinate adduct. This offers an experimental method of demonstrating the presence of ring current effects in these metalloaromatic systems.

Aromaticity in bis(imino)pyridine complexes

2019 Fall National Meeting

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