1
|
Raghavan A, Cahill CL. Orbital Engineering Mediated by Cation Conjugation in Luminescent Uranyl-Organic Hybrid Materials. Angew Chem Int Ed Engl 2024; 63:e202318161. [PMID: 38141052 DOI: 10.1002/anie.202318161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 12/24/2023]
Abstract
A series of compounds of the form [HAr]2 [UO2 X4 ] is reported here, wherein Ar is systematically varied between pyridine (1-X), quinoline (2-X), acridine (3-X), 2,5-dimethylpyrazine (4-X), quinoxaline (5-X), and phenazine (6-X), and X=Cl or Br. With greater conjugation in the organic cation, a larger quenching in uranyl luminescence is observed in the solid state. Supporting our luminescence experiments with computation, we map out the potential energy diagrams for the singlet and triplet states of both the [HAr]+ cations and [UO2 Cl4 ]2- anion in the crystalline state, and of the assembly. The distinct energy transfer pathways in each compound are discussed.
Collapse
Affiliation(s)
- Adharsh Raghavan
- Department of Chemistry, The George Washington University, 800 22nd St NW, Washington, DC 20052, USA
| | - Christopher L Cahill
- Department of Chemistry, The George Washington University, 800 22nd St NW, Washington, DC 20052, USA
| |
Collapse
|
2
|
Decoteau EA, Raghavan A, Cahill CL. Structural, Spectroscopic, and Computational Analysis of Halogen- and Hydrogen-Bonding Effects within a Series of Uranyl Fluorides with 4-Halopyridinium. Inorg Chem 2024; 63:2495-2504. [PMID: 38266166 DOI: 10.1021/acs.inorgchem.3c03699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
Reported are the syntheses and characterization of five compounds containing one-dimensional uranyl fluoride chains charge balanced by 4-X-pyridinium (X = H, F, Cl, Br, I) cations. Structural analysis reveals molecular assembly via noncovalent interactions in the second coordination sphere with the X···Oyl interaction distances ranging from 2.987(7) to 3.142(3) Å, all of which are less than or close to the sum of the van der Waals radii. These interactions were probed via luminescence and Raman spectroscopy, where the latter indicates slight differences in the U═O symmetric stretches as a consequence of U═O in-phase and out-of-phase Raman-active stretches. The decrease in the X···Oyl sum of the van der Waals overlap between comparable compounds within the series manifests as a red-shifting trend among the Raman symmetric stretches. Computational density functional theory (DFT)-based frequency, electrostatic potential surfaces (ESPs), and natural bonding orbital (NBO) methods support the observed Raman spectroscopic features and provide a comprehensive rationale for assembly.
Collapse
Affiliation(s)
- Elizabeth A Decoteau
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, District of Columbia 20052, United States
| | - Adharsh Raghavan
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, District of Columbia 20052, United States
| | - Christopher L Cahill
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, District of Columbia 20052, United States
| |
Collapse
|
3
|
Rajapaksha H, Benthin GC, Markun EL, Mason SE, Forbes TZ. Synthesis, characterization, and density functional theory investigation of (CH 6N 3) 2[NpO 2Cl 3] and Rb[NpO 2Cl 2(H 2O)] chain structures. Dalton Trans 2024. [PMID: 38265201 DOI: 10.1039/d3dt03630h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The actinyl tetrachloro complex [An(V/VI)O2Cl4]2-/3- tends to form discrete molecular units in both solution and solid state materials, but related aquachloro complexes have been observed as both discrete coordination compounds and 1-D chain topologies. Subtle differences in the inner sphere coordination significantly influence the formation of structural topologies in the actinyl chloride system, but the exact reasoning for these variations has not been delineated. In the current study, we present the synthesis, structural characterization, and vibrational analysis of two 1-D neptunyl(V) chain compounds: (CH6N3)2[NpO2Cl3] (Np-Gua) and Rb[NpO2Cl2(H2O)] (Np-Rb). Bonding and non-covalent interactions (NCIs) in the systems were evaluated using periodic Density Functional Theory (DFT) to link these properties to related phases. We observed ∼6.5% and ∼3.9% weakening of NpO bonds in Np-Gua and Np-Rb compared to the reference Cs3[NpO2Cl4]. NCI analysis distinguished specific assembly modes, where Np-Gua was connected via hydrogen bonding (N-H⋯Cleq and N-H⋯Oyl) and Np-Rb contained both cation interactions (Rb+⋯Oyl and Rb+⋯Cleq) and hydrogen bonding (Oeq-H⋯Oyl) networks. Thermodynamically viable formation pathways for both compounds were explored using DFT methodology. The [NpO2Cl4](aq)3- and [NpO2Cl3(H2O)](aq)2- substructures were identified as precursors to Np-Gua and [NpO2Cl3(H2O)](aq)2- and [NpO2Cl2(H2O)2](aq)- were isolated as the primary building units of Np-Rb. Finally, we utilized DFT to analyze the vibrational modes for Np-Gua and Np-Rb, where we found evidence of the NpO bond weakening within the Np(V) chain structures compared to [NpO2Cl4]3-.
Collapse
Affiliation(s)
| | - Grant C Benthin
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| | - Emma L Markun
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
| | - Tori Z Forbes
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| |
Collapse
|
4
|
Rajapaksha H, Benthin GC, Kravchuk DV, Lightfoot H, Mason SE, Forbes TZ. Three-Dimensional Noncovalent Interaction Network within [NpO 2Cl 4] 2- Coordination Compounds: Influence on Thermochemical and Vibrational Properties. Inorg Chem 2023; 62:17265-17275. [PMID: 37816161 PMCID: PMC10598792 DOI: 10.1021/acs.inorgchem.3c02502] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Indexed: 10/12/2023]
Abstract
Noncovalent interactions (NCIs) can influence the stability and chemical properties of pentavalent and hexavalent actinyl (AnO2+/2+) compounds. In this work, the impact of NCIs (actinyl-hydrogen and actinyl-cation interactions) on the enthalpy of formation (ΔHf) and vibrational features was evaluated using Np(VI) tetrachloro compounds as the model system. We calculated the ΔHf values of these solid-state compounds through density functional theory+ thermodynamics (DFT+ T) and validated the results against experimental ΔHf values obtained through isothermal acid calorimetry. Three structural descriptors were evaluated to develop predictors for ΔHf, finding a strong link between ΔHf and hydrogen bond energy (EHtotal) for neptunyl-hydrogen interactions and total electrostatic attraction energy (Eelectrostatictotal) for neptunyl-cation interactions. Finally, we used Raman spectroscopy together with bond order analysis to probe Np=O bond perturbation due to NCIs. Our results showed a strong correlation between the degree of NCIs by axial oxygen and red-shifting of Np=O symmetrical stretch (ν1) wavenumbers and quantitatively demonstrated that NCIs can weaken the Np=O bond. These properties were then compared to those of related U(VI) and Np(V) phases to evaluate the effects of subtle differences in the NCIs and overall properties. In general, the outcomes of our study demonstrated the role of NCIs in stabilizing actinyl solid materials, which consequently governs their thermochemical behaviors and vibrational signatures.
Collapse
Affiliation(s)
- Harindu Rajapaksha
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Grant C. Benthin
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Dmytro V. Kravchuk
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Haley Lightfoot
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Sara E. Mason
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - Tori Z. Forbes
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| |
Collapse
|
5
|
Rajapaksha H, Mason SE, Forbes TZ. Synthesis, Characterization, and Density Functional Theory Investigation of the Solid-State [UO 2Cl 4(H 2O)] 2- Complex. Inorg Chem 2023; 62:14318-14325. [PMID: 37610833 PMCID: PMC10481372 DOI: 10.1021/acs.inorgchem.3c01725] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Indexed: 08/25/2023]
Abstract
A significant number of solid-state [UO2Cl4]2- coordination compounds have been synthesized and structurally characterized. Yet, despite their purposive relative abundance in aqueous solutions, characterization of aquachlorouranium(VI) complexes remain rare. In the current study, a solid-state uranyl aqua chloro complex ((C4H12N2)2[UO2Cl4(H2O)]Cl2) was synthesized using piperazinium as a charge-balancing ligand, and the structure was determined using single-crystal X-ray diffraction. Using periodic density functional theory, the electronic structure of the [UO2Cl4(H2O)]2- complex was compared to [UO2Cl4]2- to uncover the strengthening of the U═O bond in [UO2Cl4(H2O)]2-. Changes in the strength of the U═O bond were validated further with Raman and IR spectroscopy, where uranyl symmetrical (ν1) and asymmetrical (ν3) stretches were blue-shifted compared to the reference [UO2Cl4]2- complex. Furthermore, the formation energy of the solid-state (C4H12N2)2[UO2Cl4(H2O)]Cl2 complex was calculated to be -287.60 ± 1.75 kJ mol-1 using isothermal acid calorimetry. The demonstrated higher stability relative to the related [UO2Cl4]2- complex was related to the relative stoichiometry of the counterions.
Collapse
Affiliation(s)
- Harindu Rajapaksha
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Sara E. Mason
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - Tori Z. Forbes
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| |
Collapse
|
6
|
Yang Y, Wei S, Zhao Z, Chen J, Wang J, Hu H, Minasian SG, Sun T. Synthesis, Structure, and Theoretical Calculations on NpO 2Br 42. Inorg Chem 2023; 62:13953-13963. [PMID: 37584949 DOI: 10.1021/acs.inorgchem.3c01891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
The actinide-halogen complexes (AnO2X42-, X = Cl, Br, and I) are the simplest and most representative compounds for studying the bonding nature of actinides with ligands. In this work, we attempted to synthesize the crystals of NpO2X42- (X = Cl, Br, and I). The crystals of NpO2Cl42- and NpO2Br42- were successfully synthesized, in which the structure of NpO2Br42- was obtained for the first time. The crystal of NpO2I42- could not be obtained due to the rapid reduction of Np(VI) to Np(V) by I-. The molecular structures of NpO2Cl42- and NpO2Br42- were characterized by single-crystal X-ray diffraction and infrared, Raman, and UV-Vis-NIR absorption spectroscopy. The complexes of NpO2X42- (X = Cl, Br, and I) were also investigated by density functional theory calculations, and the calculated vibration frequencies and absorption features were comparable to the experimental results. Both the experimental results and theoretical calculations demonstrate the strengthened Np-O bonds and the weakened Np-X bonds across the NpO2X42- series; however, the population analysis on the frontier molecular orbitals (MOs) of NpO2X42- indicates a slight reduction in the Np-O bonding covalency and an enhancement in the Np-X bonding covalency from NpO2Cl42- to NpO2I42-. Results in this work have enriched the crystal database of the AnO2X42- family and provided insights into the bonding nature in the actinide complexes with soft- and hard-donor ligands.
Collapse
Affiliation(s)
- Yuning Yang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Shiru Wei
- Department of Chemistry & Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Zhijin Zhao
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Jianchen Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Hanshi Hu
- Department of Chemistry & Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Stefan G Minasian
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Taoxiang Sun
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| |
Collapse
|
7
|
Rajapaksha H, Augustine LJ, Mason SE, Forbes TZ. Guiding Principles for the Rational Design of Hybrid Materials: Use of DFT Methodology for Evaluating Non-Covalent Interactions in a Uranyl Tetrahalide Model System. Angew Chem Int Ed Engl 2023; 62:e202305073. [PMID: 37177866 DOI: 10.1002/anie.202305073] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/15/2023]
Abstract
Together with the synthesis and experimental characterization of 14 hybrid materials containing [UO2 X4 ]2- (X=Cl- and Br- ) and organic cations, we report on novel methods for determining correlation trends in their formation enthalpy (ΔHf ) and observed vibrational signatures. ΔHf values were analyzed through isothermal acid calorimetry and a Density Functional Theory+Thermodynamics (DFT+T) approach with results showing good agreement between theory and experiment. Three factors (packing efficiency, cation protonation enthalpy, and hydrogen bonding energy [E H , norm total ${{E}_{H,{\rm { norm}}}^{{\rm { total}}}}$ ]) were assessed as descriptors for trends in ΔHf . Results demonstrated a strong correlation betweenE H , norm total ${E_{{\rm{H}},{\rm{norm}}}^{{\rm{total}}} }$ and ΔHf , highlighting the importance of hydrogen bonding networks in determining the relative stability of solid-state hybrid materials. Lastly, we investigate how hydrogen bonding networks affect the vibrational characteristics of uranyl solid-state materials using experimental Raman and IR spectroscopy and theoretical bond orders and find that hydrogen bonding can red-shift U≡O stretching modes. Overall, the tightly integrated experimental and theoretical studies presented here bridge the trends in macroscopic thermodynamic energies and spectroscopic features with molecular-level details of the geometry and electronic structure. This modeling framework forms a basis for exploring 3D hydrogen bonding as a tunable design feature in the pursuit of supramolecular materials by rational design.
Collapse
Affiliation(s)
- Harindu Rajapaksha
- Department of Chemistry, University of Iowa, Chemistry Building W374, Iowa City, IA 52242, USA
| | - Logan J Augustine
- Department of Chemistry, University of Iowa, Chemistry Building W374, Iowa City, IA 52242, USA
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Chemistry Building W374, Iowa City, IA 52242, USA
- Center for Funtional Nanomaterials (CFN), Brookhaven National Labotatory, Upton, NY 52242, USA
| | - Tori Z Forbes
- Department of Chemistry, University of Iowa, Chemistry Building W374, Iowa City, IA 52242, USA
| |
Collapse
|
8
|
Kohlgruber TA, Surbella III RG. (NH 4) 2[UO 2Cl 4]·2H 2O, a new uranyl tetra-chloride with ammonium charge-balancing cations. Acta Crystallogr E Crystallogr Commun 2023; 79:702-706. [PMID: 37601403 PMCID: PMC10439412 DOI: 10.1107/s2056989023005753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 06/29/2023] [Indexed: 08/22/2023]
Abstract
A new uranyl tetra-chloride salt with chemical formula, (NH4)2[UO2Cl4]·2H2O, namely, di-ammonium uranyl tetra-chloride dihydrate, 1, was prepared and crystallized via slow evaporation from a solution of 2 M hydro-chloric acid. As confirmed by powder X-ray diffraction, the title compound crystallizes with an ammonium chloride impurity that formed as a result of the breakdown of a triazine precursor. The (UO2Cl4)2- dianion is charge balanced by ammonium cations, while an extensive hydrogen-bond network donated from structural water mol-ecules stabilize the overall assembly. Compound 1 adds to the extensive collection of actinyl tetra-chloride salts, but it represents the first without an alkali cation for purely inorganic compounds. Diffuse reflectance and luminescence spectra show typical absorption and emission behavior, respectively, of uranyl materials.
Collapse
|
9
|
Augustine LJ, Rajapaksha H, Pyrch MMF, Kasperski M, Forbes TZ, Mason SE. Periodic Density Functional Theory Calculations of Uranyl Tetrachloride Compounds Engaged in Uranyl-Cation and Uranyl-Hydrogen Interactions: Electronic Structure, Vibrational, and Thermodynamic Analyses. Inorg Chem 2023; 62:372-380. [PMID: 36538814 PMCID: PMC9832540 DOI: 10.1021/acs.inorgchem.2c03476] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Solid-state uranyl hybrid structures are often formed through unique intermolecular interactions occurring between a molecular uranyl anion and a charge-balancing cation. In this work, solid-state structures of the uranyl tetrachloride anion engaged in uranyl-cation and uranyl-hydrogen interactions were studied using density functional theory (DFT). As most first-principles methods used for systems of this type focus primarily on the molecular structure, we present an extensive benchmarking study to understand the methods needed to accurately model the geometric properties of these systems. From there, the electronic and vibrational structures of the compounds were investigated through projected density of states and phonon analysis and compared to the experiment. Lastly, we present a DFT + thermodynamics approach to calculate the formation enthalpies (ΔHf) of these systems to directly relate to experimental values. Through this methodology, we were able to accurately capture trends observed in experimental results and saw good quantitative agreement in predicted ΔHf compared to the value calculated through referencing each structure to its standard state. Overall, results from this work will be used for future combined experimental and computational studies on both uranyl and neptunyl hybrid structures to delineate how varying intermolecular interaction strengths relates to the overall values of ΔHf.
Collapse
Affiliation(s)
- Logan J Augustine
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| | - Harindu Rajapaksha
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| | - Mikaela Mary F Pyrch
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| | - Maguire Kasperski
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| | - Tori Z Forbes
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United States
| |
Collapse
|
10
|
Pyrch MF, Bjorklund JL, Williams JM, Kasperski M, Mason SE, Forbes TZ. Investigations of the Cobalt Hexamine Uranyl Carbonate System: Understanding the Influence of Charge and Hydrogen Bonding on the Modification of Vibrational Modes in Uranyl Compounds. Inorg Chem 2022; 61:15023-15036. [PMID: 36099332 PMCID: PMC9516682 DOI: 10.1021/acs.inorgchem.2c01982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Hydrogen bonding networks within hexavalent uranium materials are complex and may influence the overall physical and chemical properties of the system. This is particularly true if hydrogen bonding takes places between the donor and the oxo group associated with the uranyl cation (UO22+). In the current study, we evaluate the impact of charge-assisted hydrogen bonding on the vibrational modes of the uranyl cation using uranyl tricarbonate [UO2(CO3)3]4- interactions with [Co(NH3)6]3+ as the model system. Herein, we report the synthesis and structural characterization of five novel compounds, [Co(NH3)6]Cl(CO3) (Co_Cl_CO3), [Co(NH3)6]4[UO2(CO3)3]3(H2O)11.67 (Co4U3), [Co(NH3)6]3[UO2(CO3)3]2Cl (H2O)7.5 (Co3U2_Cl), [Co(NH3)6]2[UO2(CO3)3]Cl2 (Co2U_Cl), and [Co(NH3)6]2[UO2(CO3)3]CO3 (Co2U_CO3), which contain differences in the crystalline packing and extended hydrogen bonding networks. We show that these slight changes in the supramolecular assembly and hydrogen bonding networks result in the modification of modes as observed by infrared and Raman spectroscopy. We use density functional theory calculations to assign the vibrational modes and provide an understanding about how uranyl bond perturbation and changes in hydrogen bonding interactions can impact the resulting spectroscopic signals.
Collapse
|
11
|
Byrne NM, Schofield MH, Cahill CL. A novel symmetric pyrazine (pyz)-bridged uranyl dimer [UO 2Cl 3(H 2O)(Pyz) 0.5] 22-: synthesis, structure and computational analysis. Dalton Trans 2022; 51:11013-11020. [PMID: 35791868 DOI: 10.1039/d2dt01486f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report on the synthesis of (HPyz+)2[UO2Cl3(H2O)(Pyz)0.5]2·2H2O which features a novel pyrazine-bridged uranyl dimer, [UO2Cl3(H2O)(Pyz)0.5]22-. A rigorous computational and experimental analysis of this compound was performed to fully explore the influence of coordination on the electronic structure and potential charge-transfer characteristics of this dimer, revealing a delocalized π-system across the bridging pyrazine and the axial components of both uranyl centers. Electrostatic surface potentials, used to rationalize the observed assembly, indicate a decreased basicity of the uranyl oxo versus [UO2Cl4]2-, and signify a lessened capacity for the terminal -yl oxos of the [UO2Cl3(H2O)(Pyz)0.5]22- dimer to participate in supramolecular assembly. A combined density functional theory (DFT) and quantum theory of atoms in molecules (QTAIM) analysis further evidenced an increase in UO bond strengths within the dimer, which is supported by a blue shift in the characteristic Raman-active uranyl symmetric stretch (ν1) with respect to the more typically observed [UO2Cl4]2-.
Collapse
Affiliation(s)
- Nicole M Byrne
- Department of Chemistry, The George Washington University, 800 22nd St NW, Suite 4000, Washington, D.C., 20052, USA.
| | - Mark H Schofield
- Department of Chemistry, The George Washington University, 800 22nd St NW, Suite 4000, Washington, D.C., 20052, USA.
| | - Christopher L Cahill
- Department of Chemistry, The George Washington University, 800 22nd St NW, Suite 4000, Washington, D.C., 20052, USA.
| |
Collapse
|
12
|
Structural and physicochemical characterization of ion-pair salts with dipyridyl cations and [Fe(CN)6]4- and [Fe(CN)5(NO)]2- anions. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|