Mixed-ligand fluorooxalate complex compounds of indium(III) M2[InF3(C2O4)H2O] (M = K, Rb): Synthesis and crystal structure

Abstract

Isostructural fluorooxalate complex compounds of indium(III) M₂[InF₃(C₂O₄)H₂O] (M = K, Rb), being the first representatives of a new class of mixed-ligand fluoro-containing complex compounds of indium(III) are synthesized and structurally studied for the first time. The crystal structures of M₂[InF₃(C₂O₄)H₂O] (M = K, Rb) are formed of K⁺ cations (Rb⁺ respectively) and complex [InF₃(C₂O₄)H₂O]^2– anions. The indium atom in the complex anion is surrounded by four F atoms, two of which are bridging, the oxygen atom of the coordinated H₂O molecule, and two oxygen atoms of the bis-bidentate (tetradentate) oxalate group. The coordination polyhedron of the indium atom (CN 7) is a pentagonal bipyramid. Via alternating double bridging F atoms and tetradentate bridging C₂O₄ group, the In(III) atom polyhedra are arranged in polymers chains. Via hydrogen O–H⋯F bonds the chains are organized in layers. Between the layers, the K⁺ or Rb⁺ cations are located, which strengthen the crystal structure.