CuSeO₄ and Cu(SeO₃OH)₂·6H₂O: A tribute to the enlightenment of the stereochemistry of Cu²⁺ ions by Josef Zemann (1923–2022)

Description

In the middle of the last century the stereochemistry of divalent copper atoms was mostly unknown. Crystal structure investigations of trippkeite, azurite, linarite, or teineite led Josef Zemann (1923-2022) to understand the coordination figures controlled by the Jahn-Teller-effect. In contrast to the earlier thought CuO₆ octahedra, he described the coordination figures as planar [4], tetragonal pyramidal [4+1], and tetragonal dipyramidal [4+2] (Zemann 1961; 1972). The additional ligands have none or only a minor influence on the geometry of the CuO₄ square. In honour to these pioneering investigations, two further compounds with Cu²⁺ ions are presented here: Cu(SeO₄) and Cu(SeO₃OH)₂∙6H₂O. They were synthesized at low-temperature hydrothermal conditions (220 °C) and room temperature, respectively.

Period	19 Sep 2023
Event title	MinWien2023
Event type	Conference
Location	Wien, AustriaShow on map
Degree of Recognition	International