In the reaction between Mg(AsF6)2 and an excess of XeF4 in anhydrous HF the first compound with XeF4 as a ligand on the central metal ion was isolated, [Mg(XeF2)(XeF4)](AsF6)2. X-ray structural analyses have shown that there are two ligands, XeF2 and XeF4, bound to the central metal ion. It is assumed that the XeF2 was obtained by the reduction of XeF4 during the process of crystallization. Since XeF2 is a much better ligand than XeF4, it is expected that all the formed XeF2 will be bound to the central metal ion.
COBISS.SI-ID: 22651943
Black AgSO4 could be prepared by the methathetic reaction of Ag(SbF6)2 and K2SO4 in anhydrous HF or by the reaction of AgF2 with H2SO4. According to thermoanalytical studies, the product is metastable and decomposes above 120 °C with the evolution of O2. The triclinic crystal structure of AgSO4 contains planar, rectangular AgO4 units that are connected by SO4 tetrahedra to form a three-dimensional network. Measurements of the temperature-dependent magnetic susceptibility indicate that there are strong antiferromagnetic interactions between the neighbouring Ag2+ cations.
COBISS.SI-ID: 23410215
Reactions between silylenes and fluorinated aromatic compounds were shown to be stereospecific. Similar mechanisms are almost unknown in organometallic chemistry. The products can be used as starting materials for the transfer of different fluorinated groups to organic substrates.
COBISS.SI-ID: 23814695
During the investigation of reactions between alkaline metal fluorides and titanium tetrafluoride, single crystals of K4Ti8F36·8HF and Rb4Ti8F36·6HF were prepared and their crystal structures determined. Both the structures contain previously unknown, discrete, octameric [Ti8F36]4− anions. Each of them is constructed from eight TiF6 octahedral units, sharing joint vertices and connected in that way into a cube. The herein reported [Ti8F36]4− anion represents the largest known example of discrete oligomeric species found in fluoride compounds with the metal in the oxidation state four.
COBISS.SI-ID: 26583079
Research of the thermal reactions between a medium-strong Lewis base xenon difluoride (XeF2) and titanium tetrafluoride (TiF4) were described. Using Raman spectroscopy, we focused our investigations on clarifying the complex reaction mechanisms, which lie behind the formation of a new type of Xe(II) salts with polymeric anions: [XeF]2[Ti9F38] and [Xe2F3][Ti8F33]. The 1-D and 2-D polyanions found in the structures of these compounds show an unexpected ability of maintaining relatively high ionization forms of XeF2. To date, this process was accomplished only by using the strongest known Lewis acids (e.g. SbF5). The synthetic and crystallization methods developed open new possibilities in terms of making more thermodynamically stable XeF+ in Xe2F3+ salts, containing other anions of weaker Lewis acids.
COBISS.SI-ID: 28315943