The origins of the breakdown of Bleaney's theory of magnetic anisotropy are described, based on an analysis of eleven different complexes of the second half of the 4f elements that form isostructural series.
The introduction of CF(3) reporter groups close to the paramagnetic centre in macrocyclic lanthanide(iii) complexes allows faster acquisition of (19)F magnetic resonance data, and amplifies chemical shift non-equivalence, as exemplified by the definition of ratiometric chemical shift probes for pH and, in principle, enzyme activity.
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