Consider octahedral tris-chelate complexes M(X)₃ where X is a bidentate ligand. A tris-chelate shows both geometrical and optical isomerism only when the two donor ends of X differ. How many of the fo

Question

Consider octahedral tris-chelate complexes M(X)₃ where X is a bidentate ligand. A tris-chelate shows both geometrical and optical isomerism only when the two donor ends of X differ. How many of the following bidentate ligands X give an M(X)₃ complex that shows both geometrical and optical isomerism? 2,2′-bipyridine, 8-hydroxyquinolinate (N,O), acetylacetonate, glycinate, 1,10-phenanthroline, oxalate, 1,2-diaminopropane, 2-aminophenolate (N,O)

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Symmetrical chelates (bipyridine, acetylacetonate, phenanthroline, oxalate) give only the Δ and Λ pair, so no geometrical isomerism. The unsymmetrical chelates 8-hydroxyquinolinate, glycinate, 1,2-diaminopropane and 2-aminophenolate give fac and mer forms, and each of these is chiral. Count = 4.

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