Ca(AsF3)(AsF6)2: the first alkaline earth metal cation coordinated to AsF3

Triaza-macrocyclic complexes of aluminium, gallium and indium halides: fast18F and19F incorporation via halide exchange under mild conditions in aqueous solution

“…There is also literature precedent for this behaviour in alkaline earth or lanthanide complexes of AsF 3 such as [Ca(AsF 3 )(AsF 6 ) 2 ], in which the pyramidal AsF 3 molecule behaves as a Lewis base, bonding to the metal cation via bridging uorides (with further interactions between Ca 2+ and the [AsF 6 ] À anions). 31 The puried species was dried under vacuum and treated with phosphate buffered saline (PBS) and ethanol, giving a formulation of 10% ethanol with pH 7.2. Subsequent analysis by analytical HPLC conrmed that the species was stable under these conditions for at least 2 hours.…”

Synthesis of novel salts with HF, AsF3 and XeF2 as ligands to metal cations

“…The only compound known up to now in which AsF 3 acts as a bridging agent is [Ca(AsF 3 )](AsF 6 ) 2 [30]. The compound was prepared by the reaction of CaF 2 with excess of AsF 5 in AsF 3 as a solvent:…”

Ion Selective Electrode Determination of Free Versus Total Fluoride Ion in Simple and Fluoroligand Coordinated Hexafluoropnictate (PnF6−, Pn = P, As, Sb, Bi) Salts

“…Coordination compounds of the type M(AsF 6 ) 2 · nAsF 3 (M = Mg, Ca, Sr; n = 1 or 2) were recently synthesized [31,32]. As part of the accompanying analysis [32] of these species (see Table IV) we found that the amount of F f − corresponded to the number of AsF 3 ligands coordinated to the metal centre M. That was confirmed The value given in parentheses indicates amount of F f − determined by acidifying the sample before adding a buffer solution.…”

“…The difference between amounts of F t − and F f − represents F b − bound in AsF 6 − species. Structural investigations of these type of compounds show [31,33,34] bonding of a fluorine of the AsF 3 to the metal centre, as opposed to pnictogen-metal bonding as found in low valence transition metal complexes with the π -acid ligands, the pnictogen (III) halides (PX 3 , AsX 3 , SbX 3 ) and other related phosphines, arsines and stibines containing electronegative groups.…”