In the reaction between Mg(AsF6)2 and excess of XeF4 in aHF the first compound with XeF4 as a ligand on the central metal ion was isolated, [Mg(XeF2)(XeF4)](AsF6)2. X-ray structural analysis has shown that there are two ligands, XeF2 and XeF4, bond on the central metal ion. It is supposed that XeF2 was obtained by the reduction of XeF4 during the process of crystallization. Because XeF2 is much better ligand as XeF4, it is expected that all formed XeF2 will be bonded to the central metal ion. The research challenge for the next year is the synthesis of pure compound [Mg(XeF4)2](AsF6)2.
COBISS.SI-ID: 22651943
The preparation of the isolated [Ti2F9]- anion was attempted. Both Ti atoms would be connected with three bridging F atoms while three F atoms would be terminal. The increase in the size of monocations does not favour the formation of [Ti2F9]- against [Ti4F18]- salts with isolated [Ti2F9]- or [Ti4F18]- anions. The crystal structure determination of [Me4N]+, and [Ph4P]+ salts showed that both compounds are [Ti4F18]- salts. The product of the reaction of CsF with 2TiF4 could be formulated as CsTi2F9. Instead of isolated [Ti2F9]- anions infinite ([Ti2F9]-)n double chains are present.
COBISS.SI-ID: 22746407
Crystal structure and magnetic properties of K2AgF4, related to recently studied Cs2AgF4, have been scrutinized. K2AgF4 exhibits slightly puckered [AgF2] sheets and compressed octahedral coordination of Ag(II) ions. It orders ferromagnetically below 26 K. Theoretical calculations confirm the results. The crystal structures of KAgF3 (1 D antiferromagnet below 64 K) and K3Ag2F7, a novel KAgF3/ K2AgF4 intergrogrowth phase and a member of Ruddlsden – Popper KnAgFn+2 series (n =1.5) were determined.
COBISS.SI-ID: 22775591
The syntheses, structures and Raman spectra of Ba(BF4)(PF6), Ba(BF4)(AsF6) and Ba2(BF4)2(AsF6)(H3F4) are described. The third compound has additional (H3F4-) anions which are formed in a basic aHF. Described compounds are the first examples of metal coordination compounds containing simultaneously tetrahedral BF4- and octahedral AF6- anions (A = P, As). These compounds are interesting because different combinations of AF6- anions (A = Sb, Bi, Nb, Ta, Ru, Au etc.) are possible. At the same time the influence of their size on the structural type of these compounds could be investigated.
COBISS.SI-ID: 22845991
Oximes, hydroxamic acids and related species are usually used to determine metals, rarely metalloids, non-metals and some organic species. In the chapter the properties of different groups of reagents and analytical methods in which these reagents are used the most frequently are described. The review of the most used reagents is listed together with the methods, elements and species respectively that can be determined with the specific reagent.
COBISS.SI-ID: 22426151