Structure and bonding of a radium coordination compound in the solid state
Journal Article
·
· Nature Chemistry
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
The structure and bonding of radium (Ra) is poorly understood because of challenges arising from its scarcity and radioactivity. Here we report the synthesis of a molecular Ra2+ 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 crystal structure of the Ra2+ complex shows an 11-coordinate arrangement comprising the 10 donor O atoms of dibenzo-30-crown-10 and that of a bound water molecule. Under identical crystallization conditions, barium (Ba2+) yielded a 10-coordinate ‘Pac-Man’-shaped structure lacking water. 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 Ra2+ and by analogy with Ba2+, supporting greater water lability in Ra2+ complexes than in their Ba2+ counterparts. In conclusion, barium often serves as a non-radioactive surrogate for radium, but our findings show that Ra2+ chemistry cannot always be predicted using Ba2+.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 2311306
- Journal Information:
- Nature Chemistry, Journal Name: Nature Chemistry Journal Issue: 2 Vol. 16; ISSN 1755-4330
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
RADIUM AND BARIUM NITRILOTRIACETIC ACID (NTA) COMPLEXES IN AQUEOUS SOLUTION
TRILON B COMPLEXES OF BARIUM AND RADIUM IN SOLUTION
Measurement of total radium and radium-226 in environmental waters. A tentative reference method
Journal Article
·
Wed Dec 31 23:00:00 EST 1958
· Radiokhimiya (U.S.S.R.) For English translation see Sov. Radiochem. (Engl. Transl.)
·
OSTI ID:4175007
TRILON B COMPLEXES OF BARIUM AND RADIUM IN SOLUTION
Journal Article
·
Wed Dec 31 23:00:00 EST 1958
· Radiokhimiya (U.S.S.R.) For English translation see Sov. Radiochem. (Engl. Transl.)
·
OSTI ID:4175008
Measurement of total radium and radium-226 in environmental waters. A tentative reference method
Technical Report
·
Sun Feb 29 23:00:00 EST 1976
·
OSTI ID:7330289