Abstract
The synthesis of several new planar nitrogenous tridentate ligands, specially designed to present their donor atoms at positions very close to the normal octahedral sites of a metal atom, are described. Each of these ligand moieties, when complexed to a metal atom, also possess the potential ability to lose a proton from the periphery of the ligand molecue to yield deprotonated non-charged metal complexes. The lack of change in colour and magnetic moment of complexes of these ligands, upon undergoing such deprotonation reactions, is compared with the marked increase in colour intensity and decrease in magnetic moment when charged complexes containing a 2-pyridylhydrazine entity in the ligand residue undergo similar deprotonation reactions.
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