4,7,13,18-Tetra­oxa-1,10-diazo­nia­bicyclo­[8.5.5]icosane hexa­fluorido­silicate

The asymmetric unit of the title molecular salt, C14H30N2O4 2+·SiF6 2−, contains half of both the anion and the cation, both ions being completed by a crystallographic twofold axis passing through the Si atom. The cation has a cage structure with the ammonium H atoms pointing into the cage. These H atoms are shielded from inter­molecular inter­actions and form only intra­molecular contacts. There are short inter­molecular C—H⋯F inter­actions in the structure, but no conventional inter­molecular hydrogen bonds

4,7,13,18-Tetra­oxa-1,10-diazo­nia­bicyclo­[8.5.5]icosane bis­(hexa­fluorido­phosphate)

The asymmetric unit of the title structure, C14H30N2O4 2+·2PF6 −, contains the anion and half of the cation, the latter being completed by a crystallographic twofold axis. The cation has a cage structure with the ammonium H atoms pointing into the cage. These H atoms are shielded from inter­molecular inter­actions and form only intra­molecular contacts. There are short inter­molecular C—H⋯F inter­actions in the structure, but no conventional inter­molecular hydrogen bonds

RoboLab: providing remote access to a physical radiochemistry laboratory for teaching and training

RoboLab enables students to perform real radiochemistry experiments without being physically present in a laboratory. Remotely controlled experiments are accessed through a web interface to a physical laboratory. The laboratory equipment is interfaced to a computer that both controls the equipment and provides feedback to the web user. A generic software template, using a cloud service, was developed to facilitate easy communication between the web browser and the control system. The sixth and most recent RoboLab, aiming at the production and measurement of 234mPa (T1/2 = 1.16 min), has been successfully developed and implemented using this template

Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

Online gas-solid adsorption studies with single-atom quantities of Hg, Tl, and Pb, the lighter homologs of the superheavy elements (SHE) copernicium (Cn, Z =112), nihonium (Nh, Z =113), and flerovium (Fl, Z =114), were carried out using short-lived radioisotopes. The interaction with Au and SiO 2 surfaces was studied and the overall chemical yield was determined. Suitable radioisotopes were produced in fusion-evaporation reactions, isolated in the gas-filled recoil separator TASCA, and flushed rapidly to an adjacent setup of two gas chromatography detector arrays covered with SiO 2 (first array) and Au (second array). While Tl and Pb adsorbed on the SiO 2 surface, Hg interacts only weakly and reached the Au-covered array. Our results contribute to elucidating the influence of relativistic effects on chemical properties of the heaviest elements by providing experimental data on these lighter homologs

SIMSISAK - a Method to Model Nuclide Transport in the SISAK System

A computer model that calculates the transport yield of a nuclide through an arbitrary SISAK experimental set-up has been developed. The model is intended to be used for two types of calculations connected to chemical studies of the heaviest elements. If the production cross section and the nuclide half-life are known, it can be used to estimate the number of decay events to be expected at the detection site. Consequently, if the number of atoms decaying in the detection cells is known, it can be used to estimate the production cross section or the half-life, provided that one of these properties is known