Three Organic–Inorganic Hybrids Based on [MoxOy]n– Chains Decorated with Organic Ligands and Transition-Metal Coordination Complexes

Three new organic-inorganic hybrid compounds, namely, [Cu(Hbib)(2)(gamma-Mo8O26)] (1), [{Ni(H2O)}(2)(bib)(2)(gamma-Mo8O26)]-2H(2)O (2), and [(atrz)(2)Mo2O6] (3), [bib = 1-(1-imidazolyl)-4-(1-imidazolylmethyl) benzene, atrz = 4-amino-4H-1,2,4-triazole], have been successfully synthesized under hydrothermal conditions. Crystal structure analysis shows that all of the three compounds contain rare one-dimensional (1D) infinite oxomolybdenum chains decorated with organic ligands or transitionmetal coordination complexes. Compounds 1 and 2 represent two-and three-dimensional frameworks constructed from the [gamma-Mo8O26](n)(4n-)chain integrated by different transition-metal coordination complexes, showing a 2D (4)-connected framework with (4(4).6(2)) topology and a unique 3D (4,4)-connected framework with (4.6(8).8)(2)(4(2).6(2).8(2)) topology, respectively. However, the [gamma-Mo8O26](n)(4n-) anion chains in compounds 1 and 2 are different. The adjacent (gamma-Mo8O26) 4-units in 1 are interlinked by mu(2)-oxygen atoms, and the (gamma-Mo8O26)(4-) anion units in compound 2 are interconnected by mu(3)-oxygen atoms. Compound 3 consists of 1D chains of {Mo2O4} n decorated by bis(monodentate) atrz ligands through Mo-N bonds. These compounds present good thermostability under 260 degrees C. The band gaps (E-g) of compounds 1-3 were estimated, suggesting that these inorganic-organic hybrids could be promising semiconductor materials. Compound 1 shows a high capacity to adsorb methylene blue (MB) at room temperature, owing to its special structure and chemical composition, and it can selectively capture MB molecules from binary-mixture solutions of methyl orange (MO) and MB, or MB and rhodamine B (RhB).