Anionic hexafluoroacetylacetonato complexes of alkali and other metals and the crystal structure of dirubidium tris(hexafluoroacetylacetonato)sodate

Abstract

Anionic alkali-metal complexes of the types M(hfac)₂^– and M(hfac)₃^2– are reported (hfac = CF₃·CO·CH·CO·CF₃). The counter ions present are mono-protonated, 1,8-bis(dimethylamino)naphthalene, [C₁₄H₁₉N₂]⁺, or alkali metals. The preparations of the complexes [C₁₄H₁₉N₂]⁺[M(hfac)₃]^–(M = Cu, Mg, Ni, or Mn) and [C₁₄H₁₉N₂]⁺[Tl(hfac)₂]^– are also reported.

The crystal structure of dirubidium tris(1,1,1,5,5,5-hexafluorppentane-2,4-dionato)sodate has been determined by Patterson and Fourier methods from 1127 observed reflections measured on a diffractometer, Z= 4 in an orthorhombic cell, having a= 15·603(3), b= 15·809(3), c= 10·321 (2), space group P2₁2₁2₁. Full-matrix refinement has led to R 0·096. Sodium is surrounded by a trigonal prism of oxygen atoms (Na–O 2·20–2·47 Å), the chelate, β-diketonates forming the prism sides. Each trigonal face is shared with a rubidium ion which is also in contact with fluorine atoms (some of which are disordered) in the same and in other complex anions, one rubidium cation is also co-ordinated by the oxygen atoms of one β-diketone in another anion.