Tetrameric entity resulting from two distinct dinuclear uranyl-centered motifs bridged through μ2-OH and pyridazine-3,6-dicarboxylate

The crystal structure of (UO2)4(pdzdc)3(OH)2(H2O)5·11H2O (pdzdc = pyridazine-3,6-dicarboxylate) consists of two distinct dinuclear motifs [(UO2)2N4O11] and [(UO2)2N2O10] with eight-fold and seven-fold coordinations for the uranium centers, respectively. The uranium atoms having the same environment are bridged through a μ2-hydroxo group to each other. The dimeric units are connected to each other through a carboxylate arm from a pdzdc molecule to generate tetranuclear building blocks, which are further assembled into a three-dimensional network by hydrogen bonding. Preliminary investigation of fluorescence property of the complex is presented as well as Raman and Infrared spectroscopies.

Graphical AbstractReaction of pyridazine-3,6-dicarboxylate with uranyl cation gives rise to the formation of a tetranuclear unit containing two sets of two uranyl centers linked to each other through one carboxylate arm of the organic ligand.Figure optionsDownload as PowerPoint slideResearch Highlights
► Reactivity of benzene dicarboxylate containing azine group with uranium(VI).
► Tetranuclear motifs from two sets of dinuclear units.
► Complementarities with luminescence, infrared and Raman spectroscopy.