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Title: Thermodynamic, Spectroscopic, and Computational Studies of f -Element Complexation by N -Hydroxyethyl-diethylenetriamine- N,N ', N ", N"-tetraacetic Acid

Journal Article · · Inorganic Chemistry

Potentiometric and spectroscopic techniques were combined with DFT calculations to probe the coordination environment and determine thermodynamic features of trivalent f-element complexation by N-hydroxyethyl-diethylenetriamine-N,N',N",N"-tetraacetic acid, HEDTTA. Ligand protonation constants and lanthanide stability constants were determined using potentiometry. Five protonation constants were accessible in I = 2.0 M (H+/Na+)ClO4. UV–vis spectroscopy was used to determine stability constants for Nd3+ and Am3+ complexation with HEDTTA. Luminescence spectroscopy indicates two water molecules in the inner coordination sphere of the Eu/HEDTTA complex, suggesting HEDTTA is heptadentate. Luminescence data was supported by DFT calculations, which demonstrate that substitution of the acetate pendant arm by a N-hydroxyethyl group weakens the metal–nitrogen bond. This bond elongation is reflected in HEDTTA’s ability to differentiate trivalent actinides from trivalent lanthanides. The trans-lanthanide Ln/HEDTTA complex stability trend is analogous to Ln/DTPA complexation; however, the loss of one chelate ring resulting from structural substitution weakens the complexation by ~3 orders of magnitude. Successful separation of trivalent americium from trivalent lanthanides was demonstrated when HEDTTA was utilized as aqueous holdback complexant in a liquid–liquid system. Time-dependent extraction studies for HEDTTA were compared to diethylenetriamine-N,N,N',N",N"-pentaacetic acid (DTPA) and N-hydroxyethyl-ethylenediamine-N,N',N'-triacetic acid (HEDTA). The results presented here indicate substantially enhanced phase-transfer kinetic rates for mixtures containing HEDTTA.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Idaho National Lab. (INL), Idaho Falls, ID (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC05-00OR22725; AC07-05ID14517; AC02-05CH11231
OSTI ID:
1427625
Journal Information:
Inorganic Chemistry, Vol. 56, Issue 3; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (58)

A half-century of lanthanide aminopolycarboxylates journal February 1993
EDTA-type chelating agents in everyday consumer products: Some medicinal and personal care products journal December 1984
EDTA-type chelating agents in everyday consumer products: Some food, cleaning, and photographic applications journal January 1985
Effect of inorganic, synthetic and naturally occurring chelating agents on Fe(II) mediated advanced oxidation of chlorophenols journal February 2009
Aminopolycarboxylic acid functionalized adsorbents for heavy metals removal from water journal September 2013
Soil washing for metal removal: A review of physical/chemical technologies and field applications journal March 2008
Remediation of heavy metal contaminated soil washing residues with amino polycarboxylic acids journal January 2010
Paramagnetic agents for contrast-enhanced NMR imaging: a review journal December 1983
Gadolinium(III) Chelates as MRI Contrast Agents:  Structure, Dynamics, and Applications journal September 1999
Strategies for increasing the sensitivity of gadolinium based MRI contrast agents journal January 2006
Preferential extraction of lanthanides over trivalent actinides by monoacidic organophosphates from carboxylic acids and from mixtures of carboxylic and aminopolyacetic acids journal January 1968
Kinetics and Mechanism of the Interfacial Mass Transfer of Eu(III) in the System: Bis(2-ethylhexyl)phosphoric Acid, n -Dodecane-NaCl, Lactic Acid, Polyaminocarboxylic Acid, Water journal May 1982
Trans‐Lanthanide Extraction Studies in the TALSPEAK System: Investigating the Effect of Acidity and Temperature journal April 2009
The Chemistry of TALSPEAK: A Review of the Science journal December 2014
Alternatives to HDEHP and DTPA for Simplified TALSPEAK Separations journal June 2011
The TRUSPEAK Concept: Combining CMPO and HDEHP for Separating Trivalent Lanthanides from the Transuranic Elements journal May 2013
Combining CMPO and HEH[EHP] for Separating Trivalent Lanthanides from the Transuranic Elements journal October 2013
An Advanced TALSPEAK Concept Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester as the Extractant journal December 2014
Advanced TALSPEAK Separations Using a Malonate Buffer System journal February 2015
Actinide Lanthanide Separation Process—ALSEP journal January 2014
Thermodynamic and Spectroscopic Studies of Trivalent f -element Complexation with Ethylenediamine- N,N ′-di(acetylglycine)- N,N ′-diacetic Acid journal March 2016
Coordination Chemistry and f-Element Complexation by Diethylenetriamine- N , N ″-bis(acetylglycine)- N , N ′, N ″-triacetic Acid journal October 2016
A spectrophotometric study of Am( iii ) complexation with nitrate in aqueous solution at elevated temperatures journal January 2014
Purification of Organophosphorus acid Extractants journal August 1995
Determination of the Equivalent Point in Potentiometric Titrations. journal January 1950
Determination of the equivalence point in potentiometric titrations. Part II journal January 1952
Potentiometric titrations using Gran plots: A textbook omission journal July 1965
Investigation of equilibria in solution. Determination of equilibrium constants with the HYPERQUAD suite of programs journal October 1996
Ab initiomolecular dynamics for liquid metals journal January 1993
Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium journal May 1994
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Acid Dissociation Constants and Rare Earth Stability Constants for DTPA journal February 2014
Lanthanide-anion complexation of a new polyaminopolycarboxylate, DTTAP journal January 1989
The interaction of rare earth ions with diethylenetriaminepentaacetic acid journal October 1959
Observations on the rare earths—LXXV(1) journal November 1962
Dynamic coupling contributions to the intensity of hypersensitive lanthanide transitions journal November 1974
Lanthanide ion probes of structure in biology. Laser-induced luminescence decay constants provide a direct measure of the number of metal-coordinated water molecules journal January 1979
Luminescence study on hydration states of lanthanide(III)–polyaminopolycarboxylate complexes in aqueous solution journal July 1998
Dinuclear, Bishydrated Gd III Polyaminocarboxylates with a Rigid Xylene Core Display Remarkable Proton Relaxivities journal June 2005
A Starburst-Shaped Heterometallic Compound Incorporating Six Densely Packed Gd3+ Ions journal January 2006
Observations on the rare earths—LXX journal December 1959
Thermodynamic, Spectroscopic, and Computational Studies of Lanthanide Complexation with Diethylenetriaminepentaacetic Acid: Temperature Effect and Coordination Modes journal April 2011
Syntheses and crystal structures of nine-coordinate K2[EuIII(dtpa)(H2O)]·5H2O and Na2[TbIII(Httha)]·6H2O complexes journal October 2009
The thermodynamics of lanthanide aminopolycarboxylate complexation journal November 1993
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides journal September 1976
Complexation thermodynamics and structural aspects of actinide–aminopolycarboxylates journal April 2006
Complexation kinetics of f-elements and polydentate ligands journal July 1995
Factors in Ln(III) complexation journal March 1997
Structural and Dynamic Parameters Obtained from 17 O NMR, EPR, and NMRD Studies of Monomeric and Dimeric Gd 3+ Complexes of Interest in Magnetic Resonance Imaging:  An Integrated and Theoretically Self-Consistent Approach 1 journal January 1996
Stability, structure and dynamics of cationic lanthanide(iii) complexes of N,N′-bis(propylamide)ethylenediamine-N,N′-diacetic acid journal January 2003
Synthesis, equilibrium and NMR studies of lanthanide(III) complexes of the N-mono(methylamide) and N ′-mono(methylamide) derivatives of diethylenetriamine-N,N,N ′,N ″,N ″-pentaacetic acid† journal January 2000
Studies on the kinetic stabilities of the Gd3+ complexes formed with the N-mono(methylamide), N′-mono(methylamide) and N,N″-bis(methylamide) derivatives of diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid journal July 2002
GdIII Complexes with Fast Water Exchange and High Thermodynamic Stability: Potential Building Blocks for High-Relaxivity MRI Contrast Agents journal August 2003
Physicochemical Properties of the High-Field MRI-Relevant [Gd(DTTA-Me)(H 2 O) 2 ] Complex journal August 2008
Lanthanide chelates of (bis)-hydroxymethyl-substituted DTTA with potential application as contrast agents in magnetic resonance imaging journal January 2009
Kinetics and mechanism of the complex formation reactions between copper(II) and iron(III) aqueous species and a .beta.-hydroxy oxime in toluene journal December 1980
Kinetic Studies of Lanthanoid Carboxylate Complexes. III. The Dissociation Rates of Praseodymium, Neodymium, Europium, and Erbium EDTA Complexes. journal January 1973

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