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Title: Advancing Chelation Chemistry for Actinium and Other +3 f-Elements, Am, Cm, and La

Journal Article · · Journal of the American Chemical Society

A major chemical challenge facing implementation of 225Ac in targeted alpha therapy—an emerging technology that has potential for treatment of disease—is identifying an 225Ac chelator that is compatible with in vivo applications. It is unclear how to tailor a chelator for Ac binding because Ac coordination chemistry is poorly defined. Most Ac chemistry is inferred from radiochemical experiments carried out on microscopic scales. Of the few Ac compounds that have been characterized spectroscopically, success has only been reported for simple inorganic ligands. Toward advancing understanding in Ac chelation chemistry, we have developed a method for characterizing Ac complexes that contain highly complex chelating agents using small quantities (μg) of 227Ac. We successfully characterized the chelation of Ac3+ by DOTP8– using EXAFS, NMR, and DFT techniques. To develop confidence and credibility in the Ac results, comparisons with +3 cations (Am, Cm, and La) that could be handled on the mg scale were carried out. We discovered that all M3+ cations (M = Ac, Am, Cm, La) were completely encapsulated within the binding pocket of the DOTP8– macrocycle. Further, the computational results highlighted the stability of the M(DOTP)5– complexes.

Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
Agnew National Security Fellowship; Glenn T. Seaborg Institute; Hoffman Distinguished Postdoctoral Fellowship; National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
89233218CNA000001; AC02-76SF00515
OSTI ID:
1605392
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 49 Vol. 141; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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