Synthesis, structure characterization, and properties of a new heterometallic coordination polymer containing two mu sub(3-)bridging tridentate ligands

Abstract

The synthesis, spectral characterization, single crystal structure and properties of a new potassium coordination polymer [K(LH sub(2))(MoO sub(4))] 1 (LH sub(2) = 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 sup(+), (LH sub(2)) sup(+) and (MoO sub(4)) sup(2-) located on three-fold axes. The K sup(+) ion exhibits hexa coordination and both (LH sub(2)) sup(+) and (MoO sub(4)) sup(2-) function as mu sub(3-) bridging tridentate ligands resulting in the formation of a three-dimensional (3D) polymeric structure. In the 3D polymer, the {KO sub(6)} octahedra and {MoO sub(4)} tetrahedra are interlinked into a hexagonal array of alternating {KO sub(6)} and {MoO sub(4)} polyhedra connected via corner-sharing with enclosure of (LH sub(2)) sup(+) ion in the cavity. The (LH sub(2)) sup(+) and (MoO sub(4)) sup(2-) units in 1 are interlinked with the aid of three varieties of hydrogen bonding interactions. Thermal decomposition of 1 at 600 degrees C results in the formation of K sub(2)Mo sub(2)O sub(7). Comparative structural chemistry of several (LH sub(2)) sup(+) containing compounds is described.