Synthesis, structure characterization, and properties of a new heterometallic coordination polymer containing two μ3-bridging tridentate ligands

Abstract

The synthesis, spectral characterization, single crystal structure and properties of a new potassium coordination polymer [K(LH₂)(MoO₄)] 1 (LH₂ = 1,3-dihydroxy-2-(hydroxymethyl)propan-2-aminium) are reported. The bimetallic compound 1 crystallizes in the non-centrosymmetric trigonal P3c1 space group with K⁺, (LH₂)⁺ and (MoO₄)^2– located on three-fold axes. The K⁺ ion exhibits hexa coordination and both (LH₂)⁺ and (MoO₄)^2– function as µ₃-bridging tridentate ligands resulting in the formation of a three-dimensional (3D) polymeric structure. In the 3D polymer, the {KO₆} octahedra and {MoO₄} tetrahedra are interlinked into a hexagonal array of alternating {KO₆} and {MoO₄} polyhedra connected via corner-sharing with enclosure of (LH₂)⁺ ion in the cavity. The (LH₂)⁺ and (MoO₄)^2– units in 1 are interlinked with the aid of three varieties of hydrogen bonding interactions. Thermal decomposition of 1 at 600°C results in the formation of K₂Mo₂O₇. Comparative structural chemistry of several (LH₂)⁺ containing compounds is described.