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Tumor therapy with targeted atomic nanogenerators. Barium often serves as a non-radioactive surrogate for radium, but our findings show that Ra 2+ chemistry cannot always be predicted using Ba 2+.

Furthermore, the bond distance between the Ra centre and the O atom of the coordinated water is substantially longer than would be predicted from the ionic radius of Ra 2+ and by analogy with Ba 2+, supporting greater water lability in Ra 2+ complexes than in their Ba 2+ counterparts. Under identical crystallization conditions, barium (Ba 2+) yielded a 10-coordinate ‘Pac-Man’-shaped structure lacking water. The crystal structure of the Ra 2+ complex shows an 11-coordinate arrangement comprising the 10 donor O atoms of dibenzo-30-crown-10 and that of a bound water molecule. Here we report the synthesis of a molecular Ra 2+ complex using 226Ra and the organic ligand dibenzo-30-crown-10, and its characterization in the solid state by single-crystal X-ray diffraction. The structure and bonding of radium (Ra) is poorly understood because of challenges arising from its scarcity and radioactivity.

Half life of radium