Hassium

The atomic number of Hassium (Hs), an artificial production element of the Uranium family, is 108. It was synthesized and identified in 1984 by West German researchers at the Heavy Ion Research Institute in Darmstadt (GesellschaftfürSchwerionenforschung [GSI]). According to its position in the periodic table it is expected to have the same chemical properties as ruthenium.

The GSI team led by Peter Armbruster generated a Hassium isotope in nuclear fusion reaction by irradiating lead 208 with iron ions 58. The isotopic mass is 265, very unstable, with a half-life of only 2 ms. Experiments conducted by A. G. Demin and other researchers at the Russian Federation Atomic Energy Research Institute in Dubna showed that there are two Hassium isotopes, masses 263 and 264.

The volatile ha compound (arsenic tetraoxide) selected for gas phase chemistry research from the beginning is clear, but the chemical nature of hash has long been considered a difficult task. Isotopes were first synthesized in 1984 but until 1996 it was not until 1996 that isotopes with sufficient long-lived lives were synthesized for chemical studies. Unfortunately, this isotope 269H is indirectly synthesized by the collapse of 277 CN; the indirect synthesis method is not only disadvantageous for chemical studies, the reaction yield of the isotope 277 CN is low Area is only 1 pb), not enough arsenic is provided. Atoms are used for chemistry research. Direct synthesis of 269 Hs and 270 Hs in the reaction It seems that 248 Cm (26 Mg, xn) 274 - x Hs (x = 4 or 5) is expected to be 7 pb because the reaction cross section is slightly large.

The team at Mainz plans to use GSI's new TASCA facility to study electro deposition of ha atoms. Their purpose was to use the reaction 226 Ra (48 Ca, 4 n) 270 H. In addition, GSI scientists use TASCA to study the synthesis and properties of the HAS (II) compound Hasocene, H s (C 5 H 5) 2, using the reaction 226 Ra (48 Ca, xn) I want it. This compound is similar to the lighter ferrocenes, ruthenocene and osmotic dienes and has two cyclopenta in an overlapping conformation like ferrocene and osmotic olefins rather than staggered conformation like ferrocene It is expected to have a dienyl ring. . Hasocene is chosen because it has a low morphological oxidation state of +2 (although the bond between the metal and the ring is mostly a covalent bond) rather than the previously studied high +8 state, and a relativistic effect is expected . Stronger in lower oxidation state