RadChem 2022

Session

Actinoids and Transactinoids

16 May 2022, 13:30

Casino Conference Centre

Conveners

Actinoids and Transactinoids: TAN 1

• Andreas Türler (University of Bern)
• Eva De Visser - Týnová (NRG)

Actinoids and Transactinoids: TAN Poster

• There are no conveners in this block

Actinoids and Transactinoids: TAN 2

• Robert Eichler (Paul Scherrer Institute & University of Bern)
• Christoph Düllmann

Actinoids and Transactinoids: TAN 3

• Juliane März (Helmhotz-Zentrum Dresden - Rossendorf)
• Patrick Steinegger (ETH Zurich / Paul Scherrer Institute)

903. 5f electron polarizability in a full early actinide (Th-Pu) pyren complex series

Dr Juliane März (Helmhotz-Zentrum Dresden-Rossendorf)

16/05/2022, 13:30

Chemistry of Actinide and Trans-actinide Elements

Invited

In contrast to the strongly shielded 4 f electrons of the lanthanides, 5 f electrons of particularly the early actinides are found to participate in bonding, e.g. to organic ligands. Reactivity and complexation strength of such bonds are the most influenced by donor properties of the ligand and the electronic situation of the actinide metal center. Furthermore, coinciding properties of...

892. Spectroscopic Investigation of the covalence in An(III) complexes with Picolindiamides

Thomas Sittel (Karlsruhe Institute of Technology (KIT))

16/05/2022, 14:00

Chemistry of Actinide and Trans-actinide Elements

Verbal

N-donor and O-donor ligands form strong, ninefold coordinated complexes with trivalent actinide and lanthanide ions. These excellent coordination properties make them suitable for the application as extractants and are interesting systems to study from a fundamental scientific perspective. Extraction studies have shown that N-donor ligands (e.g. nPr-BTP) are suitable for the selective...

893. Trivalent Actinide Ions Showing Tenfold Coordination in Solution

Dr Patrik Weßling (Heidelberg University)

16/05/2022, 14:20

Chemistry of Actinide and Trans-actinide Elements

Verbal

Trivalent actinides generally exhibit ninefold coordination in solution. nPr-BTP, a tridentate nitrogen donor ligand, is known to form ninefold coordinated 1:3 complexes, [An(nPr-BTP)${}_3$]${}^{3+}$ (An = U, Pu, Am, Cm) in solution.
We report the first Cm(III) complex with tenfold coordination in solution [Cm(nPr-BTP)${}_3$(NO${}_3$)]${}^{2+}$. This species was identified using time-resolved laser...

943. Advancements in the fabrication and characterization of actinide targets for superheavy element production

Prof. Christoph Düllmann (JGU Mainz / GSI Darmstadt / HIM Mainz)

16/05/2022, 14:40

Chemistry of Actinide and Trans-actinide Elements

Verbal

All isotopes of the elements with atomic numbers 114 and above as well as many of the longer-lived isotopes of lighter superheavy elements are only accessible in fusion reactions with actinide targets. Accordingly, the production of actinide targets is an important topic in the field of SHE research, especially with new accelerator facilities coming online that deliver ever more intense...

1057. Separations of the heaviest actinoids

Daniela Dvořáková (České vysoké učení technické v Praze)

16/05/2022, 17:15

Chemistry of Actinide and Trans-actinide Elements

Poster

Overall goal of this project is to contribute to the knowledge of the heaviest actinoids. The research was carried out in two main directions: development of a method for radiochemical separation of actinoid series by liquid chromatography, including a model for determining separation parameters in non-equilibrium processes at one-atom-at-a time level (JINR Dubna), and novel methods for An(II)...

1031. Chemistry with Superheavy Elements at FLNR and at PSI

Patrick Steinegger (ETH Zurich / Paul Scherrer Institute)

17/05/2022, 10:30

Chemistry of Actinide and Trans-actinide Elements

Invited

The Superheavy Element Factory in Dubna offers unique prospects regarding future chemistry experiments with superheavy elements. The very first chemistry experiment at the Superheavy Element Factory will focus on the chemical characterization of elements copernicium (Z=112) and flerovium (Z=114) in their respective elemental state, employing online gas adsorption thermochromatography. Further...

915. Synthesis and complexation of nitrogen donor ligands with tetravalent uranium

Tamara M. Duckworth (HZDR)

17/05/2022, 11:00

Chemistry of Actinide and Trans-actinide Elements

Verbal

The knowledge of complexation reactions of early actinides with nitrogen donor ligands serves not only as fundamental research in this underrepresented field of chemistry but also contributes to a deeper understanding of their reactivity and coordination chemistry. In contrast to the lanthanides, with the dominating oxidation state of + III, actinides, especially the early actinides up to...

1026. Online Gas Adsorption Chromatography of Tl/TlOH for Future Nh/NhOH Experiments

Jennifer Wilson

17/05/2022, 11:20

Chemistry of Actinide and Trans-actinide Elements

Verbal

To adequatly chemically characterize superheavy elements, such as nihonium (Nh, Z=113) which has a production rate on the order of atoms per day, thorough prestudies must be completed. Gas adsorption chromatography of cyclotron-produced ${}^{184}$Tl were conducted as preptory experiments for future Nh chemistry studies. ${}^{184}$Tl (5 neutron evaporation channel) was produced at the U-400...

920. The use of 152Eu(III) towards the elucidation of Pu(III) behavior with phosphates

Danae Carolina Escalante Gutiérrez (Université Paris-Saclay, CNRS/IN2P3-IJCLab, 91405 Orsay, France)

17/05/2022, 11:40

Chemistry of Actinide and Trans-actinide Elements

Verbal

Phosphate species from natural (e.g. phosphate mineral like apatite) as well anthropogenic (e.g. fertilizers) sources are ubiquitous in the environment [1]. Phosphoric acid is also present in the PUREX process as ultimate degradation product of tributylphosphate [2]. Phosphate species are expected to strongly interact with plutonium ions, plutonium being one of the main environmental...

879. Synthesis, characterization and stability of two americium vanadates, AmVO3 and AmVO4

Dr Karin Popa (European Commission, Joint Research Centre, Karlsruhe, Germany)

19/05/2022, 13:30

Chemistry of Actinide and Trans-actinide Elements

Verbal

The americium isotope Am-241 is formed during the storage of plutonium via beta-decay of Pu-241 with a half-life of 14.33 years. Due to its accumulation in existing stocks of civil separated plutonium in Europe, and its relatively high specific power of 0.114 W/g, Am-241 has been proposed for use in radioisotope power systems (RPS) and is under consideration by the European Space Agency (ESA)...

933. Synthesis and Characterization of Tetravalent Actinide Amidinate Halide Complexes

Boseok Hong (Helmholtz-Zentrum Dresden-Rossendorf)

19/05/2022, 13:48

Chemistry of Actinide and Trans-actinide Elements

Verbal

Introduction
Amidinate ligands have attracted considerable attention in the field of coordination chemistry over the last decades as versatile soft N-donor ligands to stabilize the transition metal complexes in various oxidation states. The additional advantages of employing amidinates over other ligand systems are their high modularity and easy access to a variety of analogs by...

945. Off-line single-atom gas chromatographic adsorption studies of bismuth

Mr Dominik Dietzel (JGU Mainz/GSI)

19/05/2022, 14:06

Chemistry of Actinide and Trans-actinide Elements

Verbal

In preparation of gas phase chemical experiments with element 115, we studied the chemical behavior of single short-lived bismuth atoms in rare gases (helium and argon) and in oxygen atmosphere. For that purpose, we performed off-line isothermal gas chromatography experiments at room temperature. The short-lived volatile Rn-219 precursor, provided from an Ac-227-source, was transported into...

952. Fundamental behavior of metals in the presence of non-conventional solvents

Dr Evgeny E. Tereshatov (Texas A&M University)

19/05/2022, 14:24

Chemistry of Actinide and Trans-actinide Elements

Verbal

Understanding of fundamental aspects of metal behavior is a key component of controlling the separation and purification process. This knowledge is based on speciation and oxidation state information leading to numerical thermodynamic parameters [1-3]. Surprisingly, there are still chemical systems with unknown stability constants of metals in the generic mineral acids. However, this situation...

998. Evaluation of Adsorption Enthalpies in Isothermal Chromatography Experiments under non-optimal Conditions - the case of Tl and TlOH on fused silica

Dr Rugard Dressler (Paul Scherrer Institut)

19/05/2022, 14:42

Chemistry of Actinide and Trans-actinide Elements

Verbal

The determination of the enthalpy of adsorption of an analyte on a defined stationary surface is one of the most important methods for the determination of chemical properties of superheavy elements (SHEs). Isothermal gas-adsorption chromatography setups have been used in various experiments to chemically study compounds of rutherfordium (Rf, Z=104), dubnium (Db, Z=105), seaborgium (Sg,...