skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A Combined Density Functional Theory and Spectrophotometry Study of the Bonding Interactions of [NpO2·M]4+ Cation–Cation Complexes

Journal Article · · Inorganic Chemistry

The equilibrium constants for [NpO2M∙]4+ (M = Al3+, In3+, Sc3+, Fe3+) in μ = 10 M nitric acid and [NpO2∙Ga]4+ in μ = 10 M hydrochloric acid media have been determined. The trend in the interaction strength follows: Fe3+ > Sc3+ In3+ > Ga3+ Al3+. These equilibrium constants are compared to those of previously reported values for NpO2+ complexes with Cr3+ and Rh3+ within the literature. Thermodynamic parameters and bonding modes are discussed, with density functional theory and natural bond orbital analysis indicating that the NpO2+ dioxocation acts as a -donor with transition-metal cations and a sigma donor with group 13 cations. The small changes in electron-donating ability is modulated by the overlap with the coordinating metal ion's valence atomic orbitals.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; SC0001815
OSTI ID:
1356947
Alternate ID(s):
OSTI ID: 1596319
Journal Information:
Inorganic Chemistry, Vol. 56, Issue 9; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (35)

Solvent Extraction of Np (V) with CMPO from Nitric Acid Solutions Containing U (VI) journal November 1992
Chemical Properties of Neptunium Applied to Neptunium Management in Extraction Cycles of Purex Process book January 1984
Specific Interaction between Np(V) and U(VI) in Aqueous Perchloric Acid Media 1 journal August 1961
Complex Ion Formation between Cations. Spectra and Identification of a Np(V)-Cr(III) Complex journal November 1962
The formation of a neptunium(V)-rhodium(III) complex. Kinetics and equilibriums in acidic solutions journal May 1967
The Formation of a Neptunium(V)-Chromium(III) Complex. Kinetics and Equilibria in Perchlorate Solutions journal March 1964
Dimerization of aquadioxovanadium(V) ion in concentrated perchloric and sulfuric acid media journal February 1984
Formation and properties of a stable heterobinuclear complex containing ruthenium and vanadium journal January 1974
Study of Hg 2 2+ and Complexes of NpO 2 + and UO 2 2+ in Solution. Examples of Cation−Cation Interactions journal October 2005
Separation and preconcentration of actinides from acidic media by extraction chromatography journal September 1993
The Chemistry of the Actinide and Transactinide Elements book January 2006
Symmetry, Optical Properties and Thermodynamics of Neptunium(V) Complexes journal December 2009
Electronic Spectrum of the NpO 2 2+ and NpO 2 + Ions journal May 2000
Investigation of equilibria in solution. Determination of equilibrium constants with the HYPERQUAD suite of programs journal October 1996
Density‐functional thermochemistry. III. The role of exact exchange journal April 1993
Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields journal November 1994
Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis journal August 1980
Systematically convergent basis sets for transition metals. I. All-electron correlation consistent basis sets for the 3d elements Sc–Zn journal August 2005
Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen journal January 1989
Gaussian basis sets for use in correlated molecular calculations. IX. The atoms gallium through krypton journal April 1999
Gaussian basis sets for use in correlated molecular calculations. III. The atoms aluminum through argon journal January 1993
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
Systematically convergent basis sets with relativistic pseudopotentials. I. Correlation consistent basis sets for the post- d group 13–15 elements journal December 2003
Sensitivity of Solvation Environment to Oxidation State and Position in the Early Actinide Period journal June 2015
Gas-Phase Uranyl, Neptunyl, and Plutonyl: Hydration and Oxidation Studied by Experiment and Theory journal June 2012
UFF, a full periodic table force field for molecular mechanics and molecular dynamics simulations journal December 1992
Applications of Polarizable Continuum Models To Determine Accurate Solution-Phase Thermochemical Values Across a Broad Range of Cation Charge – The Case of U(III–VI) journal December 2014
Natural population analysis journal July 1985
The role of inner-sphere configuration changes in electron-exchange reactions of metal complexes journal January 1982
Order phenomena in aqueous AlCl 3 solutions journal September 1979
The Structure of the Hydrated Gallium(III), Indium(III), and Chromium(III) Ions in Aqueous Solution. A Large Angle X-ray Scattering and EXAFS Study journal December 1998
Hydrolysis of Ferric Ion in Water and Conformational Equilibrium journal May 1998
X-ray Diffraction Study on Aqueous Scandium(III) Perchlorate and Chloride Solutions over the Temperature Range −45 to 95 °C journal May 1998
Neptunium redox speciation journal January 2001
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides journal September 1976

Cited By (2)

Impacts of hydrogen bonding interactions with Np( v / vi )O 2 Cl 4 complexes: vibrational spectroscopy, redox behavior, and computational analysis journal January 2020
Ion association with tetra-n-alkylammonium cations stabilizes higher-oxidation-state neptunium dioxocations journal January 2019