Molecular Dynamics Simulations of Complexation of Am(III) with a Preorganized Dicationic Ligand in an Ionic Liquid

Singh, Meena B.; Fu, Yuqing; Popovs, Ilja; Jansone-Popova, Santa; Dai, Sheng; Jiang, De-en

doi:10.1021/acs.jpcb.1c04410

Title: Molecular Dynamics Simulations of Complexation of Am(III) with a Preorganized Dicationic Ligand in an Ionic Liquid

Journal Article · Thu Jul 22 00:00:00 EDT 2021 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry

DOI:https://doi.org/10.1021/acs.jpcb.1c04410· OSTI ID:1836437

Singh, Meena B. ^[1]; Fu, Yuqing ^[1];

^[2];

^[3];

^[1]

Univ. of California, Riverside, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Preorganized ligands with imidazolium arms have been found to be highly selective in extracting Am(III) into ionic liquids (ILs), but the detailed structure and mechanism of the complexation process in the ionic solvation environment are unclear. Here, we carry out molecular dynamics simulation of the complexation of Am(III) with a preorganized 1,10-phenanthroline-2,9-dicarboxamide complexant (L) functionalized with alkyl chains and imidazolium cations in the butylmethylimidazolium bistriflimide ([BMIM][NTf₂]) IL. Both Am:L (1:1) and Am:L₂ (1:2) complexes are examined. In the absence of the ligand, Am(III) is found to be coordinated by six NTf₂ anions via nine O donors in the first solvation shell. In the Am:L complex, Am(III) is coordinated to the ligand via two O donors and four NTf₂ anions via seven O donors in the first coordination shell. In the Am:L₂ complex, Am(III) is coordinated to the two ligands via four O donors and four NTf₂ anions via five O donors. The imidazolium arms of the ligands play an important role in the secondary solvation environment by attracting NTf₂ anions closer to the metal center. As a result, we find that the binding free energy for the second L²⁺ ligand is twice that for the first L²⁺ ligand, making the Am:L₂ complex significantly more stable than the Am:L complex. This study highlights the multiple factors and tunability in using preorganized ligands with charged functional groups in an ionic solvation environment, which could hold the key to achieving desired selectivity in ion extraction efficiency.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC00ERKCG21

OSTI ID:: 1836437

Journal Information:: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 125, Issue 30; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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molecular dynamics simulation
preorganized ligands
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ion extraction
complexation
binding free energy

Title: Molecular Dynamics Simulations of Complexation of Am(III) with a Preorganized Dicationic Ligand in an Ionic Liquid

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