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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2016 ; 7
(ä): 12312
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Spectroscopic and computational investigation of actinium coordination chemistry
#MMPMID27531582
Ferrier MG
; Batista ER
; Berg JM
; Birnbaum ER
; Cross JN
; Engle JW
; La Pierre HS
; Kozimor SA
; Lezama Pacheco JS
; Stein BW
; Stieber SC
; Wilson JJ
Nat Commun
2016[Aug]; 7
(ä): 12312
PMID27531582
show ga
Actinium-225 is a promising isotope for targeted-? 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, Ac(III) 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 Ac(III) and Am(III) in HCl
solutions indicate Ac(III) coordinates more inner-sphere Cl(1-) ligands (3.2±1.1)
than Am(III) (0.8±0.3). These results imply diverse reactivity for the +3
actinides and highlight the unexpected and unique Ac(III) chemical behaviour.