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Organocurium compounds and biological aspects

Organometallic complexes analogous to uranocene are known also for other actinides, such as thorium, protactinium, neptunium, plutonium and americium. Molecular orbital theory predicts a stable "curocene" complex (η -C H) Cm, but it has not been reported experimentally yet.

Formation of the complexes of the type Cm(n-C H -BTP) (BTP = 2,6-di(1,2,4-triazin-3-yl)pyridine), in solutions containing n-C H -BTP and Cm ions has been confirmed by EXAFS. Some of these BTP-type complexes selectively interact with curium and thus are useful for separating it from lanthanides and another actinides. Dissolved Cm ions bind with many organic compounds, such as hydroxamic acid, urea, fluorescein and adenosine triphosphate. Many of these compounds are related to biological activity of various microorganisms. The resulting complexes show strong yellow-orange emission under UV light excitation, which is convenient not only for their detection, but also for studying interactions between the Cm ion and the ligands via changes in the half-life (of the order ~0.1 ms) and spectrum of the fluorescence.

Curium has no biological significance. There are a few reports on biosorption of Cm by bacteria and archaea, but no evidence for incorporation of curium into them.