“Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates

Pu, Ning; Su, Jing; Xu, Lei; Sun, Taoxiang; Batista, Enrique R.; Chen, Jing; Yang, Ping; Shafer, Jenifer C.; Xu, Chao

doi:10.1021/acs.inorgchem.9b01931

Title: “Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd ³⁺ Chelation: A Case of Three Aryldithiophosphinates

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Abstract

Bis(o-trifluoromethylphenyl) dithiophosphinate is a sulfur donating ligand capable of providing the largest reported trivalent lanthanide (Ln3+)/actinide (An3+) group separation factors. Literature has shown the placement and number of the -CF3 functionalities on the aryl rings proximate to the ligating sulfurs can significantly impact Ln3+/An3+ extraction and separation factors, but the complexation thermodynamics of -CF3 derivatized aryl dithiophosphinates have not been considered to date. This systematic study considers the complexation of three aryl CF3-substituted dithiophosphinates - bis(phenyl) dithiophosphinate (LI), (o-trifluoromethylphenyl)(phenyl) dithiophosphinate (LII), and bis(o-trifluoromethylphenyl) dithiophosphinate (LIII), with Nd3+ in an ethanol environment. The chelating ability of Nd(III) by these ligands follows the order of LIII > LII > LI, which is in line with the reported extraction efficiency. The positive ΔS, as well as positive ΔH, suggests Nd3+ chelation is entropy driven and effective desolvation is critical to enable Nd3+ interaction with otherwise weakly interacting sulfur containing ligands. EXAFS results confirm thermodynamic investigations and suggest that LI can only form up to 1:2 (M/L) complexes, while LII and LIII form up to 1:3 complexes with Nd3+. All three LIII anions have bidentate interactions with Nd(III), but two LII anions have bidentate interactions with Nd3+ while the third LII anion is monodentate.more »« less

Authors:

Pu, Ning ^[1];

^[2]; Xu, Lei ^[1]; Sun, Taoxiang ^[1];

^[2]; Chen, Jing ^[1];

^[2];

^[3];

^[1]

Tsinghua Univ., Beijing (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Colorado School of Mines, Golden, CO (United States)

Publication Date:: Mon Sep 09 00:00:00 EDT 2019

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States); Tsinghua Univ., Beijing (China)

Sponsoring Org.:: USDOE Office of Science (SC). Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1571623

Alternate Identifier(s):: OSTI ID: 1657526

Report Number(s):: LA-UR-19-26491
Journal ID: ISSN 0020-1669

Grant/Contract Number:: 89233218CNA000001; SC0012039; SC0020189

Resource Type:: Accepted Manuscript

Journal Name:: Inorganic Chemistry

Additional Journal Information:: Journal Volume: 59; Journal Issue: 1; Journal ID: ISSN 0020-1669

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY

Citation Formats


                    Pu, Ning, Su, Jing, Xu, Lei, Sun, Taoxiang, Batista, Enrique R., Chen, Jing, Yang, Ping, Shafer, Jenifer C., and Xu, Chao. “Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates.  United States: N. p., 2019. 
Web.  doi:10.1021/acs.inorgchem.9b01931.

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                    Pu, Ning, Su, Jing, Xu, Lei, Sun, Taoxiang, Batista, Enrique R., Chen, Jing, Yang, Ping, Shafer, Jenifer C., & Xu, Chao. “Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates.  United States.  https://doi.org/10.1021/acs.inorgchem.9b01931

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                    Pu, Ning, Su, Jing, Xu, Lei, Sun, Taoxiang, Batista, Enrique R., Chen, Jing, Yang, Ping, Shafer, Jenifer C., and Xu, Chao. Mon .  
"“Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates".  United States.  https://doi.org/10.1021/acs.inorgchem.9b01931.  https://www.osti.gov/servlets/purl/1571623.

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@article{osti_1571623,

  title        = {“Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates},

  author       = {Pu, Ning and Su, Jing and Xu, Lei and Sun, Taoxiang and Batista, Enrique R. and Chen, Jing and Yang, Ping and Shafer, Jenifer C. and Xu, Chao},

  abstractNote = {Bis(o-trifluoromethylphenyl) dithiophosphinate is a sulfur donating ligand capable of providing the largest reported trivalent lanthanide (Ln3+)/actinide (An3+) group separation factors. Literature has shown the placement and number of the -CF3 functionalities on the aryl rings proximate to the ligating sulfurs can significantly impact Ln3+/An3+ extraction and separation factors, but the complexation thermodynamics of -CF3 derivatized aryl dithiophosphinates have not been considered to date. This systematic study considers the complexation of three aryl CF3-substituted dithiophosphinates - bis(phenyl) dithiophosphinate (LI), (o-trifluoromethylphenyl)(phenyl) dithiophosphinate (LII), and bis(o-trifluoromethylphenyl) dithiophosphinate (LIII), with Nd3+ in an ethanol environment. The chelating ability of Nd(III) by these ligands follows the order of LIII > LII > LI, which is in line with the reported extraction efficiency. The positive ΔS, as well as positive ΔH, suggests Nd3+ chelation is entropy driven and effective desolvation is critical to enable Nd3+ interaction with otherwise weakly interacting sulfur containing ligands. EXAFS results confirm thermodynamic investigations and suggest that LI can only form up to 1:2 (M/L) complexes, while LII and LIII form up to 1:3 complexes with Nd3+. All three LIII anions have bidentate interactions with Nd(III), but two LII anions have bidentate interactions with Nd3+ while the third LII anion is monodentate. The significant increase in ΔS with each o-CF3 addition suggests aiding desolvation could be central in enabling f-element interaction with weakly interacting donor groups and this report provides an approach to controlling f-element desolvation as an innovative f-element chelating strategy.},

  doi          = {10.1021/acs.inorgchem.9b01931},

  journal      = {Inorganic Chemistry},

  number       = 1,

  volume       = 59,

  place        = {United States},

  year         = {Mon Sep 09 00:00:00 EDT 2019},

  month        = {Mon Sep 09 00:00:00 EDT 2019}

}

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Title: “Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd 3+ Chelation: A Case of Three Aryldithiophosphinates

Abstract

Citation Formats

Title: “Sweeping” Ortho Substituents Drive Desolvation and Overwhelm Electronic Effects in Nd ³⁺ Chelation: A Case of Three Aryldithiophosphinates