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Title: Spectroscopic and computational investigation of actinium coordination chemistry

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12312· OSTI ID:1338756
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Stanford Univ., CA (United States)
  3. California State Polytechnic Univ., Pomona, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Cornell Univ., Ithaca, NY (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Actinium-225 is a promising isotope for targeted-α therapy. Unfortunately, progress in developing chelators for medicinal applications has been hindered by a limited understanding of actinium chemistry. This knowledge gap is primarily associated with handling actinium, as it is highly radioactive and in short supply. Hence, AcIII reactivity is often inferred from the lanthanides and minor actinides (that is, Am, Cm), with limited success. Here we overcome these challenges and characterize actinium in HCl solutions using X-ray absorption spectroscopy and molecular dynamics density functional theory. The Ac–Cl and Ac–OH2O distances are measured to be 2.95(3) and 2.59(3) Å, respectively. The X-ray absorption spectroscopy comparisons between AcIII and AmIII in HCl solutions indicate AcIII coordinates more inner-sphere Cl1– ligands (3.2±1.1) than AmIII (0.8±0.3). Finally, these results imply diverse reactivity for the +3 actinides and highlight the unexpected and unique AcIII chemical behaviour.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Inst. of Health (NIH) (United States)
Contributing Organization:
Stanford Univ., CA (United States); California State Polytechnic Univ., Pomona, CA (United States); Cornell Univ., Ithaca, NY (United States)
Grant/Contract Number:
AC52-06NA25396; AC02-76SF00515
OSTI ID:
1338756
Report Number(s):
LA-UR-16-20582
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 61 works
Citation information provided by
Web of Science

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Cited By (14)

Picomolar Traces of Americium(III) Introduce Drastic Changes in the Structural Chemistry of Terbium(III): A Break in the “Gadolinium Break” journal August 2017
An Eighteen-Membered Macrocyclic Ligand for Actinium-225 Targeted Alpha Therapy journal October 2017
Octadentate Picolinic Acid-Based Bispidine Ligand for Radiometal Ions journal October 2017
Contemporary Chemistry of Berkelium and Californium journal June 2019
Chemical aspects of metal ion chelation in the synthesis and application antibody-based radiotracers journal March 2018
Active actinium journal October 2016
Relativistic quantum chemical calculations show that the uranium molecule U2 has a quadruple bond journal October 2018
Bispidines for radiopharmaceuticals journal January 2018
Response to “Comment on ‘On the development of polarizable and Lennard-Jones force fields to study hydration structure and dynamics of actinide(III) ions based on effective ionic radii’” [J. Chem. Phys. 150 , 097101 (2019)] journal March 2019
Evaluation of polydentate picolinic acid chelating ligands and an α-melanocyte-stimulating hormone derivative for targeted alpha therapy using ISOL-produced 225Ac journal August 2019
Chemical aspects of metal ion chelation in the synthesis and application antibody-based radiotracers text January 2018
An Eighteen-Membered Macrocyclic Ligand for Actinium-225 Targeted Alpha Therapy journal October 2017
Evaluation of polydentate picolinic acid chelating ligands and an α-melanocyte-stimulating hormone derivative for targeted alpha therapy using ISOL-produced 225Ac text January 2019
Synthesis and Characterization of the Actinium Aquo Ion journal February 2017

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