The conjugate base of 19.28 forms the complex [COL3] which has mer- and fac-isomers,
(a) Draw the structures of these isomers, and explain why the labels mer and fac are used,
(b) What other type of isomerism does [COL3] exhibit?
(c) When a freshly prepared sample of [COL3] is chromatographed, two fractions, A and B, are collected. The 19F NMR spectrum of A exhibits a singlet, while that of B shows thrEP signals with relative integrals of 1:1: I. Rationalize these data.
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