Triphenylphosphine oxide complexes of metal(II) tetrafluoroborates

Abstract

A number of new complexes containing triphenylphosphine oxide is reported. The compounds have the general formula M(TPPO) n (BF 4) 2, in which M = Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn, Cd ( n = 4) and Co,Ni ( n = 5). Thet are characterized and identified by chemical analysis and physical measurements. It is shown that the tetrakis cobalt and zinc compounds contain tetrahedrally solvated metal ions and that the pentakis cobalt and nickel complexes contain octahedrally coordinated metal ions. The measurements on the tetrakis manganese, nickel and cadmium compounds can best be correlated with a basically square pyramidal structure. For the copper complex a square planar surrounding of the metal ions is suggested. The compounds of magnesium, calcium and iron are believed to contain distorted octahedrally coordinated metal ions. The interesting behaviour of the nickel complexes on heating is discussed and it is shown that in this way a tetrahedral modification can be obtained.