Comparative Review of O,O′-, N,O-, and N,N′-Bidentate Ligands: Structural and Electronic Properties of β-Diketones, Enaminones, and β-Diketiminates

'-bidentate ligands. Overall, the comparison demonstrates that donor atom substitution within a conserved conjugated scaffold provides a systematic approach to tuning acidity, coordination behaviour, and redox properties, offering a coherent framework for understanding structure-property relationships in 1,3-dicarbonyl-derived chelating ligands.