Luminescent 1-hydroxy-2-pyridinone chelates of lanthanides

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The present invention provides luminescent complexes between a lanthanide ion and an organic ligand which contains 1, 2-hydroxypyridinone units. The complexes of the invention are stable in aqueous solutions and are useful as molecular probes, for example in medical diagnostics and bioanalytical assay systems. The invention also provides methods of using the complexes of the invention.