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  1. Article ; Online: Nuclear Sample Provenance and Age Determination Using Ruthenium Isotopes.

    Hanson, Susan K / Sanborn, Matthew E / Trellue, Holly R / Kinman, William S

    Analytical chemistry

    2022  Volume 94, Issue 8, Page(s) 3645–3651

    Abstract: Measurements of the ruthenium isotopic composition of nuclear samples could provide information about the method of sample production, sample irradiation history, and age. To investigate the feasibility and applicability of this idea, this study focuses ... ...

    Abstract Measurements of the ruthenium isotopic composition of nuclear samples could provide information about the method of sample production, sample irradiation history, and age. To investigate the feasibility and applicability of this idea, this study focuses on measurements of the ruthenium isotope composition of a nominally single-isotope
    MeSH term(s) Isotopes ; Reference Standards ; Ruthenium ; Uranium/analysis
    Chemical Substances Isotopes ; Uranium (4OC371KSTK) ; Ruthenium (7UI0TKC3U5)
    Language English
    Publishing date 2022-02-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.1c05218
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  2. Article: Nuclear Sample Provenance and Age Determination Using Ruthenium Isotopes

    Hanson, Susan K. / Sanborn, Matthew E. / Trellue, Holly R. / Kinman, William S.

    Analytical chemistry. 2022 Feb. 14, v. 94, no. 8

    2022  

    Abstract: Measurements of the ruthenium isotopic composition of nuclear samples could provide information about the method of sample production, sample irradiation history, and age. To investigate the feasibility and applicability of this idea, this study focuses ... ...

    Abstract Measurements of the ruthenium isotopic composition of nuclear samples could provide information about the method of sample production, sample irradiation history, and age. To investigate the feasibility and applicability of this idea, this study focuses on measurements of the ruthenium isotope composition of a nominally single-isotope ¹⁰⁶Ru radioactivity standard, where the complications of environmental mixing are eliminated. The measurements of the ¹⁰⁶Ru standards reveal unusual stable ruthenium isotopic compositions consistent with fissiogenic ruthenium. Three different lots of the material have been investigated, and the isotopic composition is found to be different for lot 1 as compared to lots 2 and 3, indicating a longer irradiation duration incurred during the production of lot 1. Through measurements of ¹⁰⁶Ru and its ¹⁰⁶Pd daughter, radiochronometry can be used to infer the ages of the samples. Lot 1 is older than lots 2 and 3 and was produced 4.91(5) years before the reference date of 1/1/21, approximately 2.7 years before lots 2 and 3. In an effort to better understand the sample production pathway, the isotopic measurements are compared with nuclear reactor simulations, which suggest that the material was generated by irradiation of a low-enriched uranium target material in a light water reactor. These findings have significant implications for nuclear treaty monitoring, providing an example of the power of ruthenium isotope measurements to discern details of sample origin and history.
    Keywords age determination ; analytical chemistry ; irradiation ; isotopes ; provenance ; radioactivity ; ruthenium ; uranium
    Language English
    Dates of publication 2022-0214
    Size p. 3645-3651.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.1c05218
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  3. Article ; Online: N-Heterocyclic Carbene to Actinide d-Based π-bonding Correlates with Observed Metal-Carbene Bond Length Shortening Versus Lanthanide Congeners.

    Goodwin, Conrad A P / Adams, Ralph W / Gaunt, Andrew J / Hanson, Susan K / Janicke, Michael T / Kaltsoyannis, Nikolas / Liddle, Stephen T / May, Iain / Miller, Jeffrey L / Scott, Brian L / Seed, John A / Whitehead, George F S

    Journal of the American Chemical Society

    2024  Volume 146, Issue 15, Page(s) 10367–10380

    Abstract: Comparison of bonding and electronic structural features between trivalent lanthanide (Ln) and actinide (An) complexes across homologous series' of molecules can provide insights into subtle and overt periodic trends. Of keen interest and debate is the ... ...

    Abstract Comparison of bonding and electronic structural features between trivalent lanthanide (Ln) and actinide (An) complexes across homologous series' of molecules can provide insights into subtle and overt periodic trends. Of keen interest and debate is the extent to which the valence f- and d-orbitals of trivalent Ln/An ions engage in covalent interactions with different ligand donor functionalities and, crucially, how bonding differences change as both the Ln and An series are traversed. Synthesis and characterization (SC-XRD, NMR, UV-vis-NIR, and computational modeling) of the homologous lanthanide and actinide N-heterocyclic carbene (NHC) complexes [M(C
    Language English
    Publishing date 2024-04-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.3c12721
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  4. Article ; Online: A new method for quantifying

    Wren, Melinda S / Weberg, Alexander B / Salazar, Amanda A / Klosterman, Michael R / Eaton, Susan J / Goehring, Tanya L / Herman, Staci M / Pierson, Bruce D / Warzecha, Evan J / Dale, Gregory E / Fotiades, Nikolaos / May, Iain / Hanson, Susan K

    Talanta

    2024  Volume 275, Page(s) 126140

    Abstract: ... ...

    Abstract Quantifying
    Language English
    Publishing date 2024-04-22
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2024.126140
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  5. Article ; Online: Knocking on wood: base metal complexes as catalysts for selective oxidation of lignin models and extracts.

    Hanson, Susan K / Baker, R Tom

    Accounts of chemical research

    2015  Volume 48, Issue 7, Page(s) 2037–2048

    Abstract: This work began as part of a biomass conversion catalysis project with UC Santa Barbara funded by the first NSF Chemical Bonding Center, CATSB. Recognizing that catalytic aerobic oxidation of diol C-C bonds could potentially be used to break down ... ...

    Abstract This work began as part of a biomass conversion catalysis project with UC Santa Barbara funded by the first NSF Chemical Bonding Center, CATSB. Recognizing that catalytic aerobic oxidation of diol C-C bonds could potentially be used to break down lignocellulose, we began to synthesize oxovanadium complexes and explore their fundamental reactivity. Of course there were theories regarding the oxidation mechanism, but our mechanistic studies soon revealed a number of surprises of the type that keep all chemists coming back to the bench! We realized that these reactions were also exciting in that they actually used the oxygen-on-every-carbon property of biomass-derived molecules to control the selectivity of the oxidation. When we found that these oxovanadium complexes tended to convert sugars predominantly to formic acid and carbon dioxide, we replaced one of the OH groups with an ether and entered the dark world of lignin chemistry. In this Account, we summarize results from our collaboration and from our individual labs. In particular, we show that oxidation selectivity (C-C vs C-O bond cleavage) of lignin models using air and vanadium complexes depends on the ancillary ligands, the reaction solvent, and the substrate structure (i.e., phenolic vs non-phenolic). Selected vanadium complexes in the presence of added base serve as effective alcohol oxidation catalysts via a novel base-assisted dehydrogenation pathway. In contrast, copper catalysts effect direct C-C bond cleavage of these lignin models, presumably through a radical pathway. The most active vanadium catalyst exhibits unique activity for the depolymerization of organosolv lignin. After Weckhuysen's excellent 2010 review on lignin valorization, the number of catalysis studies and approaches on both lignin models and extracts has expanded rapidly. Today we are seeing new start-ups and lignin production facilities sprouting up across the globe as we all work to prove wrong the old pulp and paper chemist's adage: you can make anything from lignin except money!
    MeSH term(s) Catalysis ; Lignin/chemistry ; Models, Molecular ; Molecular Structure ; Organometallic Compounds/chemistry ; Oxidation-Reduction
    Chemical Substances Organometallic Compounds ; Lignin (9005-53-2)
    Language English
    Publishing date 2015-07-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
    ZDB-ID 1483291-4
    ISSN 1520-4898 ; 0001-4842
    ISSN (online) 1520-4898
    ISSN 0001-4842
    DOI 10.1021/acs.accounts.5b00104
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  6. Article ; Online: Trace Actinide Signatures of a Bulk Neptunium Sample

    Reilly, Sean D. / Patton, Genna M. / Murillo, Jesse / Oldham, Warren J. / Miller, Jeffrey L. / LaMont, Stephen P. / Sanborn, Matthew E. / May, Iain / Gaunt, Andrew J. / Hanson, Susan K.

    Analytical Chemistry. 2023 June 01, v. 95, no. 23 p.9123-9129

    2023  

    Abstract: In nuclear forensic analyses, measurements of actinide elements in a sample can assist with identifying interdicted or unknown materials. While these radiochemical signatures have been extensively investigated in uranium materials, less is known about ... ...

    Abstract In nuclear forensic analyses, measurements of actinide elements in a sample can assist with identifying interdicted or unknown materials. While these radiochemical signatures have been extensively investigated in uranium materials, less is known about bulk neptunium samples. This paper describes the measurement of trace actinide concentrations and isotopic profiles in a ²³⁷Np oxide sample. Uranium, plutonium, americium, and curium concentrations and isotopic profiles in the sample were determined and deemed potentially useful for distinguishing different sources of ²³⁷Np. Several different potential radiochronometry systems were also investigated; discordant results indicate that the Np sample was never completely purified of other actinide elements, or that subsequent contamination of the sample occurred. Few prior studies of neptunium materials have been reported, and these data suggest that trace actinide constituents could provide unique signatures to identify material out of regulatory control.
    Keywords americium ; analytical chemistry ; curium ; forensic sciences ; neptunium ; plutonium ; uranium
    Language English
    Dates of publication 2023-0601
    Size p. 9123-9129.
    Publishing place American Chemical Society
    Document type Article ; Online
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.3c01682
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  7. Article ; Online: Chemical separation and measurement of platinum activation products

    Wren, Melinda S. / May, Iain / Guardincerri, Elena / Boswell, Melissa S. / Herman, Staci M. / Warzecha, Evan J. / Haney, Morgan M. / Fotiades, Nikolaos / Dale, Gregory E. / Hanson, Susan K.

    Talanta. 2023 Aug., v. 260 p.124587-

    2023  

    Abstract: A method has been developed to purify and measure platinum radioisotopes in the presence of fission products and environmental constituents. The method uses a combination of cation exchange and anion exchange chromatography and selective precipitation ... ...

    Abstract A method has been developed to purify and measure platinum radioisotopes in the presence of fission products and environmental constituents. The method uses a combination of cation exchange and anion exchange chromatography and selective precipitation steps to remove other radioisotopes from the sample. The addition of stable platinum carrier allows for a gravimetric determination of the chemical yield of the procedure. Overall, the method is fast, simple, and potentially applicable for rapid turnaround of unknown samples. Using this method, multiple platinum radioisotopes were measured in two different irradiation experiments. The measured ratios of the platinum radioisotopes clearly reflect the neutron spectrum of the irradiation, suggesting that platinum radioisotopes could be valuable signatures in nuclear forensic analyses.
    Keywords anion exchange chromatography ; cation exchange ; forensic sciences ; irradiation ; neutrons ; platinum ; separation ; Radiochemistry ; Nuclear forensics ; Gamma-ray spectrometry ; Activation products ; Platinum radioisotopes
    Language English
    Dates of publication 2023-08
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2023.124587
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  8. Article ; Online: Trace Actinide Signatures of a Bulk Neptunium Sample.

    Reilly, Sean D / Patton, Genna M / Murillo, Jesse / Oldham, Warren J / Miller, Jeffrey L / LaMont, Stephen P / Sanborn, Matthew E / May, Iain / Gaunt, Andrew J / Hanson, Susan K

    Analytical chemistry

    2023  Volume 95, Issue 23, Page(s) 9123–9129

    Abstract: In nuclear forensic analyses, measurements of actinide elements in a sample can assist with identifying interdicted or unknown materials. While these radiochemical signatures have been extensively investigated in uranium materials, less is known about ... ...

    Abstract In nuclear forensic analyses, measurements of actinide elements in a sample can assist with identifying interdicted or unknown materials. While these radiochemical signatures have been extensively investigated in uranium materials, less is known about bulk neptunium samples. This paper describes the measurement of trace actinide concentrations and isotopic profiles in a
    Language English
    Publishing date 2023-06-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.3c01682
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    In stock of ZB MED Cologne/Königswinter

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  9. Article ; Online: Chemical separation and measurement of platinum activation products.

    Wren, Melinda S / May, Iain / Guardincerri, Elena / Boswell, Melissa S / Herman, Staci M / Warzecha, Evan J / Haney, Morgan M / Fotiades, Nikolaos / Dale, Gregory E / Hanson, Susan K

    Talanta

    2023  Volume 260, Page(s) 124587

    Abstract: A method has been developed to purify and measure platinum radioisotopes in the presence of fission products and environmental constituents. The method uses a combination of cation exchange and anion exchange chromatography and selective precipitation ... ...

    Abstract A method has been developed to purify and measure platinum radioisotopes in the presence of fission products and environmental constituents. The method uses a combination of cation exchange and anion exchange chromatography and selective precipitation steps to remove other radioisotopes from the sample. The addition of stable platinum carrier allows for a gravimetric determination of the chemical yield of the procedure. Overall, the method is fast, simple, and potentially applicable for rapid turnaround of unknown samples. Using this method, multiple platinum radioisotopes were measured in two different irradiation experiments. The measured ratios of the platinum radioisotopes clearly reflect the neutron spectrum of the irradiation, suggesting that platinum radioisotopes could be valuable signatures in nuclear forensic analyses.
    Language English
    Publishing date 2023-04-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2023.124587
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  10. Article ; Online: Cobalt-catalyzed transfer hydrogenation of C=O and C=N bonds.

    Zhang, Guoqi / Hanson, Susan K

    Chemical communications (Cambridge, England)

    2013  Volume 49, Issue 86, Page(s) 10151–10153

    Abstract: An earth-abundant metal cobalt catalyst has been developed for the transfer hydrogenation of ketones, aldehydes, and imines under mild conditions. Experiments are described which provide insights into the mechanism of the transfer hydrogenation reaction. ...

    Abstract An earth-abundant metal cobalt catalyst has been developed for the transfer hydrogenation of ketones, aldehydes, and imines under mild conditions. Experiments are described which provide insights into the mechanism of the transfer hydrogenation reaction.
    Language English
    Publishing date 2013-10-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c3cc45900d
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