Abstract
Abstract Octahedrally coordinated metal complexes of the type M(A-B), where A-B is an unsymmetrical bidentate ligand can exist in two isomeric forms, facial and the meridional. Since the magnetic environments of the ligand atoms in the two forms are different, NMR studies are ideal for distinction between such isomers. This means that each chemical shift found for the free ligand should be reflected by three chemical shifts in the meridional complex but not in the facial complex. In the past, 'H NMR studies have been used to determine the geometry of cobalt (111) chelates of P-diketones,' pyrrole-2-aldimine2. salicyladimine2, a-aminoacids3 and other bidentate ligands-'. However, a distinct three line pattern of chemical shifts has been observed for only one or two of the many protons with the rest submerged in crowded proton splitting patterns.
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