Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Density Functional Theory Guided Investigation of Ligand‐Induced Neptunyl‐Neptunyl Interactions

Journal Article · · European Journal of Inorganic Chemistry
Abstract

Actinyl‐actinyl interactions are particularly prevalent for the pentavalent neptunyl cation (Np(V)O 2 ) + where these interactions appear either as a T ‐ or D ‐shape (diamond‐shape). T ‐shaped interactions have been previously identified in high concentration Np(V) solutions containing simple anions (NO 3 , ClO 4 , Cl ) whereas D ‐shaped have only been isolated in the solid‐state in the presence of carboxylate ligands. In this study, Density Functional Theory (DFT) calculations were paired with Raman spectroscopy to evaluate the formation of D ‐shaped interactions in the presence of aliphatic (R=H (formate), CH 3 (acetate), CH 2 CH 3 (propionate)) and aromatic (R=C 6 H 5 (benzoate), C 6 H 4 OH (4‐hydroxybenzoate), C 5 H 4 N (isonicotinate)) carboxylate ligands. DFT studies indicate that the Δ G to form hydrated T ‐ and D ‐shaped forms are not spontaneous but become so with the addition of the carboxylate ligands. Raman spectra of the Np(V) carboxylate solutions contained vibrational modes associated with the D ‐shaped interactions, but spectral changes observed over time indicate a dynamic system. Crystallization experiments from the Np(V) carboxylate systems confirmed the presence of D‐ shaped dimers for the aromatic carboxylates, suggesting that the choice of the anion in solution favors actinyl‐actinyl interactions even at low concentrations (≤20 mM) of Np(V).

Research Organization:
University of Iowa, Iowa City, IA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021420
OSTI ID:
1963122
Alternate ID(s):
OSTI ID: 2386947
Journal Information:
European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 14 Vol. 26; ISSN 1434-1948
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (44)

Synthesis and Characterization of the First 2 D Neptunyl Structure Stabilized by Side-on Cation-Cation Interactions journal January 2013
An efficient grid-based scheme to compute QTAIM atomic properties without explicit calculation of zero-flux surfaces journal May 2009
TmoleX-A graphical user interface for TURBOMOLE journal January 2010
An efficient method for computing the QTAIM topology of a scalar field: The electron density case journal November 2012
Molecular oxides of high-valent actinides journal May 2020
Bader’s Theory of Atoms in Molecules (AIM) and its Applications to Chemical Bonding journal October 2016
“Cation-cation” complexes of pentavalent actinides—I journal January 1979
Crystal structure of a neptunyl cation-cation complex (NpO2+) with mellitic acid: Na4(NpO2)2Cl12O12·8H2O journal June 1984
RI-MP2: optimized auxiliary basis sets and demonstration of efficiency journal September 1998
Raman spectroscopy of neptunyl and plutonyl in aqueous solutions: hydrolysis of Np(VI) and Pu(VI) and disproportionation of Pu(V) journal February 1984
Oxo ligand functionalization in the uranyl ion (UO22+) journal February 2010
The crystal and coordination chemistry of neptunium in all its oxidation states: An expanded structural hierarchy of neptunium compounds journal October 2021
A high performance grid-based algorithm for computing QTAIM properties journal April 2009
Effect of temperature on the complexation of NpO2+ with benzoic acid: Spectrophotometric and calorimetric studies journal January 2015
Segmented contraction scheme for small-core actinide pseudopotential basis sets journal March 2004
Thermodynamics and Structure of Neptunium(V) Complexes with Formate. Spectroscopic and Theoretical Study journal April 2020
Three-Dimensional Network of Cation–Cation-Bound Neptunyl(V) Squares: Synthesis and in Situ Raman Spectroscopy Studies journal February 2016
Recent Advances in Aqueous Actinide Chemistry and Thermodynamics journal October 2012
Raman spectrometric studies of "cation-cation" complexes of pentavalent actinides in aqueous perchlorate solutions journal March 1982
Investigations of "cation-cation" complexes of neptunyl ion (NpO2+) solutions by large-angle x-ray scattering journal January 1983
Study of Hg 2 2+ and Complexes of NpO 2 + and UO 2 2+ in Solution. Examples of Cation−Cation Interactions journal October 2005
Vibrational Spectroscopic Investigation of Benzoic Acid Adsorbed on Silver journal August 1994
Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields journal November 1994
Relativistic and correlation effects for element 105 (hahnium, Ha): a comparative study of M and MO (M = Nb, Ta, Ha) using energy-adjusted ab initio pseudopotentials journal June 1993
Specific Interaction between Np(V) and U(VI) in Aqueous Perchloric Acid Media 1 journal August 1961
Polynuclear Cation−Cation Complexes of Pentavalent Uranyl: Relating Stability and Magnetic Properties to Structure journal December 2008
Electronic Structure and Bonding in Actinyl Ions and their Analogs journal May 2007
A Reliable and Efficient First Principles-Based Method for Predicting p K a Values. 2. Organic Acids journal January 2010
Elucidating cation–cation interactions in neptunyl dications using multi-reference ab initio theory journal January 2019
Use of vibrational spectroscopy to identify the formation of neptunyl–neptunyl interactions: a paired density functional theory and Raman spectroscopy study journal January 2022
Valence basis sets for relativistic energy-consistent small-core actinide pseudopotentials journal January 2003
Gaussian‐2 theory for molecular energies of first‐ and second‐row compounds journal June 1991
Density‐functional thermochemistry. III. The role of exact exchange journal April 1993
Energy‐adjusted pseudopotentials for the actinides. Parameter sets and test calculations for thorium and thorium monoxide journal May 1994
TURBOMOLE: Modular program suite for ab initio quantum-chemical and condensed-matter simulations journal May 2020
Cation–cation interaction in crystalline actinide compounds journal January 2004
Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal January 1988
Dimeric dioxocations, (NpO 2 + ) 2 , in the structure of bis(μ-2-fluorobenzoato-κ 2 O : O ′)di-μ-oxo-bis[(2,2′-bipyridine-κ 2 N , N ′)oxoneptunium(V)] journal January 2007
Crystal structure of new complexes of Np(V) and Pu(V) propionates with 2,2’-bipyridine, [AnO2(C10H8N2)(OOCC2H5)(H2O)] journal February 2010
Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis journal August 1980
Solvent effect on preferred protonation sites in nicotinate and isonicotinate anions journal April 1996
Actinide Environmental Chemistry journal January 1995
Cation–cation interaction in crystal structures of Np(V) and Pu(V) benzoate complexes with 2,2′-bipyridine, [NpO2(C10H8N2)(OOCC6H5)]2 and [PuO2(C10H8N2)(OOCC6H5)]2 journal January 2007
Neptunyl Compounds: Polyhedron Geometries, Bond-Valence Parameters, and Structural Hierarchy journal December 2008