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.

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The chemical shift of paramagnetically shifted resonances in lanthanide(III)c omplexes encodes information about temperature and has also been made to report pH in parallel, through introduction of as ingle phosphonate group adjacentt ot he reporter tert-butyl resonance. The enhanced sensitivity of this new probe has allowed the simultaneous triple imaging of the water signal and the shifted tert-butyl signals of thulium and dysprosium complexes of ac ommon ligand, separated by over 160 ppm. In parallel spectrali maging experiments,t he temperature andp Hd ependence of the frequencyo ft he Tm and Dy signals has been deconvoluted, allowing the pH andt emperature in the liver,k idney and bladder to be measured.