On the chemistry of gallium: Part 19. Synthesis and crystal structure analysis of novel complexes containing Ga–FeCp(CO) 2-fragments

Abstract

The gallium subhalides Ga 2Cl 4·2dioxane and sonochemically prepared GaI were reacted with the carbonyl ferrate K[Cp(CO) 2Fe] and the iron carbonyl dimer [Cp(CO) 2Fe] 2, respectively. In all the reactions performed, the gallium(I) and gallium(II) compounds disproportionated into elemental gallium and gallium(III) compounds. Several novel complexes containing Ga–FeCp(CO) 2 fragments were isolated and characterized spectroscopically and by X-ray crystal structure analysis. These are compounds of the types Cp(CO) 2FeGaX 2(B) [B=THF, dioxane, I −[FeCp(C 7H 8)] +; X=Cl, I] and [Cp(CO) 2Fe] 2GaCl(B) [B=THF, 0.5 KCl]. In addition, the cage compounds [Cp(CO) 2FeGa] 6(μ 3-O) 4(μ-OH) 2I 2 and [Cp(CO) 2FeGa] 4FeK 2(OEt 2) 4(μ 3-O) 2(μ-Br) 4(μ 3-Br) 4 were isolated. In all these complexes the gallium atoms are surrounded tetrahedrally by substituents. GaFe bond lengths are in the range of 231–239 pm.