Molybdenum-oxygen anionic chain grafted by Cu-phen complex. Synthesis, crystal structure and properties

• A polyoxomolybdate anion chain {Mo3O10}n2n − was formed under hydrothermal condition.
• The graft of [Cu(phen)(H2O)2]2 + fragments to the chain leads to a fishbone chain.
• The coordination of phen to Cu2 + ion leads a phosphorescent n–π* and π–π* transition.

An unreported inorganic-organic hybrid compound [Cu(phen)(H2O)2(Mo3O10)] (1) was hydrothermally synthesized and characterized with elemental analysis, IR spectroscopy, thermal analysis, luminescent spectroscopy, magnetic measurement. The crystal structure was determined with X-ray single-crystal diffraction. Compound 1 has a 1-D chain structure constructed by {Mo3O10}2 − units via edge-sharing and [Cu(phen)(H2O)2]2 + fragments grafting the chain from two sides via the coordination of the terminal oxygen atom of the MoO6 octahedra to Cu2 + ion. The coordination of phen to Cu2 + ion increases the molecular rigidity so that an emission peak at 500 nm was observed and assigned to the phosphorescent n–π* and π–π* transition from ligand-centered triple state. In compound 1 Cu(II) exhibits an antiferromagnetic exchange.

Hydrothermally synthesis gave a polymeric polyoxomolybdate chain {Mo3O10}n2n − grafting with [Cu(phen)(H2O)2]2 + complex fragments. The coordination of phen to Cu ion increases the molecular rigid therefore a phosphorescent n–π* and π–π* transition from ligand-centered triple state was observed.Figure optionsDownload as PowerPoint slide